Electrical Cali Flashcards

Question 1

Q

In pressurized enclosures of Class 1 Div 1, where the conduit is not part of the system, conduit seal offs shall be installed ___ inches from the pressurized cabinet.

Answer

A

501.15(A)(2)

18 inches

Question 2

Q

Which of the following is not an acceptable means of connecting a ground path?

Answer

A

250.8 (B)

Solid solder connection

Question 3

Q

An electric car plug with a 7000 watt/ 208 volt 3 phase rating will require a ___ amp fuse.

Answer

A

7000watts ÷ ( 208 Volts (1.73)) = 19.45 amps

19.45 A × 125 % = 24.31 or 25 amp fuse.

Question 4

Q

All markings on conductors or electrical materials requiring markings shall have markings that will withstand _________.

Answer

A

110.12

The environment involved.

Question 5

Q

In a Class 1 Div 2 environment, all the threaded conduit entries shall be engaged a minimum of ____ threads NPT

a) 2
b) 3
c) 4
d) 5

Answer

A

8 (E)(1)

d) 5 threads

Question 6

Q

The conductors between the utility interactive inverter and the service equipment, such as a utility is the ______.

a) Utility-interactive Inverter Output ckt
b) Inverter-Output connection
c) Inverter service feed
d) none of the above

Answer

A

2 Definition

a) Utility - Interactive Inverter Output ckt

Question 7

Q

Which type communication cable is designed to ensure continued operations of critical circuits under fire conditions?

a) CMR cable
b) CI cable
c) CM cable
d) CMX cable

Answer

A

2 Definitions

b) CI cable (similar to mineral insulated)

Question 8

Q

Which of the following is not considered an interconnected electric power source?

a) Solar Voltaic system
b) Fuel cell sytem
c) batteries
d) generator

Answer

A

2 Definitions

c) Batteries

Question 9

Q

Edison ‘type S’ fuse holders shall be used

a) for replacement only
b) as noninterchangeable with lower amp classifications
c) with non-removeable adapters
d) all of the above

Answer

A

51

d) all of the above

Question 10

Q

The working space in front of electrical equipment 600 volts or less shall not be used for _______.

a) storage
b) guarded
c) illuminated
d) none of the above

Answer

A

26

a) storage

Question 11

Q

Fixed ladders, in vaults, shall be ______.

a) Alluminum
b) Corrosion resistant
c) Fiberglass
d) Locked from the inside

Answer

A

79

b) Corrosion resistant

Question 12

Q

Each Multiwire branch circuit shall ______ all ungrounded conductors.

a) group
b) open
c) close
d) simultaneously disconnect

Answer

A

4(B)

d) simultaneously disconnet

Question 13

Q

Floor outlets shall not be counted unless located with in _____ inches of the wall.

a) 6 in
b) 12 in
c) 18 in
d) 24 in

Answer

A

52(A)(3)

c) 18 inches

Question 14

Q

The grounded conductor of the parallel service enterance shall not be small than _______.

a) 1/0
b) 2/0
c) 3/0
d) 250 mcm

Answer

A

24(C)(2)

a) 1/0

Question 15

Q

Location of service equipment disconnecting means shall be ________.

a) within sight from
b) readily accesible
c) both a + b
d) neither a or b

Answer

A

70(A)(1)

b) readily accesible

Question 16

Q

For fixed outdoor snow melting equipment, grounding sheaths or braids shall be permitted to be embedded in ________.

a) asphalt
b) masonry
c) both a + b
d) neither a or b

Answer

A

22(A)

c) both a + b

Question 17

Q

In motion picture locations, DC plugging boxes shall be rated not less than ____ amps.

a) 20
b) 30
c) 40
d) 50

Answer

A

14

b) 30 amp

Question 18

Q

The power supply to a mobile home shall not have more than one listed _____ amp attachment plug.

a) 30
b) 40
c) 50
d) 60

Answer

A

43(A)

c) 50

Question 19

Q

Lighting circuits for recreational vehicle switches shall not be rated less than ______ amps.

a) 5
b) 10
c) 15
d) 20

Answer

A

51(A)(1)

b) 10

Question 20

Q

Each tenant space for sign or outline lighting (stirp mall, box stores, etc) shall be supplied by a branch circuit rated at least ____ amps.

a) 15
b) 20
c) 30
d) 40

Answer

A

5(A)

b) 20

Question 21

Q

Branch circuit power for audio system equipment shall no be placed, laterally, within _____feet to the inside of the pool wall.

a) 3 feet
b) 5 feet
c) 6 feet
d) 10 feet

Answer

A

10

b) 5 feet

Question 22

Q

Electric vehicle charging loads shall not be considered continuous loads.

a) T
b) F

Answer

A

42

b) False , EVC are continous loads 125%

Question 23

Q

Which of the following is true of a conductor that has good insulation?

a) When tested, the insulation will have a high resistance
b) It can be used only in wet locations
c) When tested, the insulation will have a low resistance.
d) It can be used only in dry locations

Answer

A

a) When tested, the insulation will have a high resistance

The conductor should have a low resistance in order to allow sufficient current flow but the resistance of the insulation should be high so that the current and voltage stays within the conductor. Keeping other non current carrying metal raceways and enclosures from becoming energized.

Question 24

Q

What is the approximate power AP of a 7.5 HP motor?

a) 5595 Watts
b) 4350 Watts
c) 6204 Watts
d) 7215 Watts

Answer

A

a) 5595 Watts
7. 5 x 746 = 5595 Watts

1 HP = 746 Watts

Question 25

Q

Which of the following is used to apply DC voltage to a wire or busbar in order to test the resistance of the wire or busbar?

a) Ohms meter
b) True RMS meter
c) Inductance tester
d) Megger

Answer

A

d) Megger

Question 26

Q

The term “within sight from” requires it to be seen and with in ____ feet.

a) 20
b) 30
c) 40
d) 50

Answer

A

100 definitions

d) 50 feet

Question 27

Q

When conductors are ran inside a cabinet, containing a panel board and splice or tap, the conductor fill shall be a maximum of _____%.

a) 20
b) 40
c) 60
d) 75

Question 28

Q

When installed in a bundle in a communications tray, which type of circuit is not permitted in the same raceway?

a) Power limited fire alarm circuit
b) Class 2 & 3 remote control, signaling, power limited circuit
c) Class 1 circuits
d) community antenae television and radio circuits

Answer

A

133(A) + (B)

c) Class 1 circuits

Question 29

Q

An accomidation with 2 or more contiguous rooms comprising a compartment, with or without doors in between such rooms, that provide living, sleeping, sanitary, & storage facilities is a ______.

a) motel
b) guest suite
c) guest room
d) apt

Answer

A

100 Definitions

b) guest suite

Question 30

Q

Where a single receptacle is mounted in a hallway wall, the wall can be no wider than ____ feet.

a) 6 feet
b) 8 feet
c) 10 feet
d) 12 feet

Answer

A

c) 10 feet

210. 52(H)

Question 31

Q

Illumination shall be provided for all ______ about service equipment installed indoors.

a) working spaces
b) storage spaces
c) walls
d) none of the above

Answer

A

a) working spaces

110. 34(D)

Question 32

Q

Multi conductor flat cable shall have a ______ on the grounded conductor.

a) distinctive white or gray marking
b) marking and identifying it throughout its length
c) neither a or b
d) both a & b

Answer

A

d) both a & b

322. 120(B)

Question 33

Q

Resturant lighting shall be _____ volt/amps per sq ft.

a) 22
b) 33
c) 3
d) 2

Answer

A

d) 2

Table 220.12

Question 34

Q

Flourescent luminares that utilize double ended lamps with ballast, shall have disconnecting means ________.

a) Internal
b) External
c) a or b
d) neither

Answer

A

c) a or b
410. 130(G)

Internal or external disconnect

Question 35

Q

A dishwasher shall be cord and plug connected if it ______.

a) is accessible (not behind the dishwasher/adjacent)
b) is 3 to 4 feet in length
c) located to avoid physical damage
d) all of the above

Answer

A

d) all of the above

Question 36

Q

For fixed electric heating equipment for pipeline and vessels, cord and plug connected equipment, rated ______, shall be permitted to be the disconnecting means.

a) 15 amps or less
b) 20 amps or less
c) 30 amps or less
d) none of the above

Answer

A

b) 20 amps or less

427. 55(B)

Question 37

Q

Generators shall have a nameplate giving ______.

a) manufactures name
b) frequency
c) power factor
d) all of the above

Answer

A

d) all of the above

445. 11

Question 38

Q

A hybrid power source may include _______.

a) photo voltaic
b) wind
c) engine driven generators
d) all of the above

Answer

A

d) all of the above

705. 2

Question 39

Q

A border light installed on a stage is a ________.

a) permanent overhead strip light
b) footlight
c) floodlight
d) portable light

Answer

A

a) permanent overhead strip fixture

520. 2 Definitions

Question 40

Q

Each motion picture projector shall have a clear working space of not less that ______ inches.

a) 15”
b) 24”
c) 30”
d) 36”

Answer

A

c) 30 inches

540. 12

Question 41

Q

When installed in other than raceways, cable trays, boxes or cables, communications wires and cables shall be seperated from electric light, power, class 1 circuits by _____ inches.

a) 2”
b) 3”
c) 4”
d) 6”

Answer

A

a) 2 inches

800. 133(A)(2)

Question 42

Q

In an occupancy of more than 100 people, a temporary moveable switchboard shall use _____ cable.

a) portable extra hard usage
b) twisted portable
c) jacketed tinsel
d) parallel twisted

Answer

A

a) portable extra hard usage

518. 3(B)

Question 43

Q

Knob and tube wiring supports, when required to be rigidly supported, shall not be more than _____ feet apart.

a) 2.5 feet
b) 3 feet
c) 4.5 feet
d) 6 feet

Answer

A

c) 4.5 feet

394. 30(A)(2(

Question 44

Q

A luminaire labeled ______ shall be allowed to be in contact with insulation.

a) LI
b) IC
c) O
d) DP

Answer

A

b) IC

410. 16(A)(2)

Question 45

Q

When determining the minimum required working space for a panelboard, which of the following is condition 3?

a) exposed live parts on both sides
b) exposed live parts on one side
c) exposed live parts on one side and grounded objects on the other side
d) exposed live parts on one side and concrete wall on the other side

Answer

A

a) exposed live parts on both sides of the working space

110. 26(A)(1)

Question 46

Q

Where is a GFCI protection required for 125 volt single phase, 15-and 20-ampere receptacles?

a) restaurant dining room
b) dept. store show window
c) restaurant kitchen
d) doctors office

Answer

A

c) restaurant kitchen

210. 8(B)

Question 47

Q

When is a light switch required at each interior floor level of a dwelling unit staircase?

a) more than 6 stair risers
b) more than 4 stair risers
c) less than 6 stair risers
d) 6 or more stair risers

Answer

A

d) 6 or more stair risers

210. 70(A)(2)(c)

Question 48

Q

What is the maximum voltage that coaxial cable can supply power to equipment that is directly associated with the community antenna television and radio distribution system?

a) 40 V
b) 80 V
c) 60 V
d) 50 V

Answer

A

c) 60 V

820. 15

Question 49

Q

What is the temperature (in degrees) adder for a rooftop raceway mounted 6 inches above the rooftop?

a) 33C
b) 14C
c) 40F
d) 30F

Answer

A

d) 30*F

310. 15(B)(3)(c)

Question 50

Q

Where passing through a floor, what is the maximum height above the floor that multi conductor non power limited fire alarm circuit cable must be installed in a metal raceway?

a) 8 feet above floor
b) 6 feet above floor
c) 6 inches above floor
d) 7 feet above floor

Answer

A

d) 7 feet above finished floor

760. 53(A)(2)

Question 51

Q

What is the maximum percentage of the cross sectional area that conductors, splices, and taps can occupy in a cabinet that encloses a panelboard?

a) 75%
b) 50%
c) 40%
d) 60%

Answer

A

a) 75%

312. 8

Question 52

Q

What is the total value in VA for the 2 kitchen small appliance circuits required at a dwelling?

a) 4500 VA
b) 3000 VA
c) 1200 VA
d) 1500 VA

Answer

A

b) 3000 VA
220. 52(A)

Each 2 wire kitchen and laundry branch circuit shall be calculated at 1500 VA.

2 x 1500 VA = 3000 VA

Question 53

Q

Which of the following flexible cords can be used in a show window or showcase?

a) SEW
b) SRD
c) SVE
d) SPE-1

Answer

A

a) SEW

400. 11

Question 54

Q

If the attic is accessible only by a portable ladder, an AC cable requires protection if located within ______ feet of an attic enterance.

a) 4’
b) 7’
c) 6’
d) 8’

Answer

A

c) 6 feet

320. 23(A)

Question 55

Q

Which of the following applies to a group of 6 service disconnect switches?

a) should be more than 50 feet apart
b) must be marked to indicate load served
c) must be within 25 feet of the load served
d) must be marked to identify them as a “ main disconnect”

Answer

A

b) must be marked to indicate load served

230. 72(A)

Question 56

Q

What is the minimum width for the workspace required in front of a 277/480 volt panelboard?

a) 36 inches
b) 48 inches
c) 30 inches
d) 42 inches

Answer

A

c) 30 inches
110. 26(A)(1)(b)

minimum work space width for electrical equipment is the width of the equipment or 30 inches, whichever is greater.

Question 57

Q

The rating of a branch circuit is determined by

a) the size of the overcurrent device
b) the conductor size
c) 125% of the load
d) equipment nameplate

Answer

A

a) the size of the overcurrent device

210. 3

Question 58

Q

A supplemental ground rod is not required if the first ground rod:

a) is bonded to an above ground water pipe
b) is 10 foot long
c) has a resistance to earth of 25 ohms or less
d) is a listed ground rod

Answer

A

c) has a resistance to earth of 25 ohms or less
250. 53(A)(2) Exception A single rod, pipe, or plate electrode shall be supplemented by an additional electrode unless the first electrode has a resistance to earth of 25 ohms or less.

Question 59

Q

Ground fault protection is required in WYE connected services of more than 150 V to ground, but not more than 1000 V phase to phase for each service disconnect rated:

a) 600 amps
b) 800 amps
c) less than 1000 amps
d) 1000 amps or larger

Answer

A

d) 1000 amps or larger

230. 95 Each service disconnect rated 1000 amps or more requires ground fault protection of equipment.

Question 60

Q

The calculation of the service load for an existing installation can be based on actual demand if the maximum demand data is available for what time frame?

a) 24 months
b) 90 days
c) 1 Year
d) 6 months

Answer

A

c) 1 year

220.87(1)
Maximum demand data is available for a 1 year period.
Maximum demand at 125 % plus the new load does not exceed the ampacity of the feeder or rating of the service.
Feeder has overcurrent protection in accordance with 240.4 and the service has overload protection in accordance with 230.90

Question 61

Q

If confined space conditions have been identified, which of the following is required before employees may begin work?

a) ventilation provided if testing reveals presence of oxygen
b) confined space must be blocked off
c) written operating procedures must be prepared, and employees must be trained
d) lines containing hazardous substances must be purged

Answer

A

c) written operating procedures must be prepared, and employees must be trained

CAL/OSHA guide page 23-24

Question 62

Q

What is the minimum overhead clearance required for 120/240 volt service conductors above a residential driveway?

a) 15 feet
b) 12 feet
c) 18 feet
d) 10 feet

Answer

A

b) 12 feet
230. 24(B)(2) Requires at least 12 feet for service conductors over residential property and driveways where the voltage does not exceed 300 volts to ground.

Question 63

Q

If the size of a motor overload device, serving a continuous duty motor with a service factor of 1.15 is not sufficient for the starting current of the motor, what percentage of full load current can it be increase to?

a) 140%
b) 130%
c) 150%
d) 125%

Answer

A

a) 140%
430. 32(C) Where the sensing element or setting or sizing of the overload device selected is not sufficient to start the motor or to carry the load, higher size sensing elements or incremental settings or sizing shall be permitted to be used, provided the trip current of the overload device does not exceed the following percentage of motor nameplate full load current rating.

> Motors with marked service factor 1.15 or greater
140%
Motors with a marked temp rise 40*C or less
140%
All other motors 130%

Question 64

Q

How many receptacles are needed to serve an 11 foot long kitchen countertop installed against a wall?

a) 2
b) 5
c) 3
d) 4

Answer

A

c) 3
210. 52(C) requires a receptacle within 2 feet of each end of the countertop. Placing one at 2 foot from each end leaves a 7 foot section of countertop. One more receptacle placed in the center of the 7 foot span ensures that no space along the counter is more than 2 foot from a receptacle.

Answer 64

A

c) 18 AWG
725. 49(A) specifies that conductors of sizes 18 AWG and 16 AWG are permitted to be used for class 1 circuit conductors.

Answer 65

A

a) by the available fault current, duration of the fault and distance to the fault.

NFPA 70E D.2.4

Answer 66

A

b) injury to persons
430. 43 A motor overload device capable of restarting a motor automatically after overload tripping must not be installed if the automatic restarting of the motor can result in injury to persons.

Answer 67

A

d) weatherproof cover

404. 4(B) A flush mounted switch or circuit breaker shall be equipped with a weather proof cover.

Answer 68

A

a) not less than the branch circuit rating
210. 21(B)(1) Except as allowed in exceptions 1 and 2, a single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.

Answer 69

A

b) Approved

110. 2 The conductors and equipment required or permitted by this code shall be acceptable only if approved.

Answer 70

A

c) 350 amps

Table 310.15(B)(17)

Answer 71

A

b) 10,000 VA

Table 220.44 The portion of the receptacle load above 10,000 VA in other than dwelling units can be calculated at 50%.

Answer 72

A

b) The opening time decreases as the current draw increases

Thermal magnetic circuit breakers open quicker on larger faults. The smaller the fault condition will trigger the thermal portion of the circuit breaker over time while a large short circuit condition will cause the magnetic portion of the device to trigger the blow-open contact assembly very quickly.

Answer 73

A

a) one-quarter of the working length

CAL/OSHA guide page 90

4:1 ratio with extension ladders

Answer 74

A

b) igniter of a gas stove
210. 52(B)(2) exception 2 The kitchen small appliance circuits can also provide power to receptacles for supplemental equipment and lighting on gas fired ranges, ovens, or counter-mounted cooking units.

Answer 75

A

b) Amperage

Answer 76

A

d) 12x’s O.D. of the cable

336. 24

Answer 77

A

a) nothing

110. 26

Answer 78

A

c) permitted to be so identified

388. 120

Answer 79

A

d) 5 conductors

410. 20

Answer 80

A

a) dwelling unit

410. 30(G)(1)

Answer 81

A

c) 12 inches

424. 39

Answer 82

A

c) grounding sheath

426. 22(A)

Answer 83

A

d) 150 Volts

Answer 84

A

c) pole mounted

547. 9(A)(2)

Answer 85

A

a) 5,000 amps
240. 83(C). Every circuit breaker (other than those used for supplemental overcurrent protection) having an interrupting rating other than 5000 amperes shall have its interrupting rating shown on the circuit breaker.

Quicksearch: Circuit breakers/ Markings. 240.83.

Answer 86

A

a) within 12 inches of the box and 4.5 foot intervals
348. 30(A). FMC shall be securely fastened in place by an approved means within 300 mm (12 in.) of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed 1.4 m (4.5ft).

Quicksearch: Flexible metal conduit/ Securing and supporting. 348.30.

Answer 87

A

b) if the cord length is between 18 in. and 36 in.
422. 16(B)(4). Range hoods can be cord-and-plug-connected if all of the following conditions are met:

(1) The flexible cord is terminated with a grounding-type attachment plug.
(2) The length of the cord is not less than 450 mm (18 in.) and not over 1.2m (4 ft.).
(3) Receptacles are located to avoid physical damage to the flexible cord.
(4) The receptacle is accessible.
(5) The receptacle is supplied by an individual branch circuit.

Quicksearch: Hoods, range, cord-and-plug-connected. 422.16(B)(4).

Answer 88

A

b) Branch circuits serving the crawl space
210. 12(A). AFCI protection is not required in the garage, outdoors, or in an unfinished basement or crawl space. AFCI protection is required in the family room, dining room, living room, parlor, library, den, bedroom, sunroom, recreation room, closets, hallways or similar rooms or areas.

Quicksearch: Arc-fault circuit interrupters. 210.12.

Answer 89

A

d) Listed reducers at the seal
505. 16(A)(1). Only listed reducers can be installed at a point between the seal and the point at which the conduit leaves the Zone 0 location.

Quicksearch: Hazardous (classified) locations, Class 1, Zone 0, 1, and 2 locations/ Sealing/ Drainage and 505.16.

Answer 90

A

Table 430.52.

Provides the percentages of motor full load current to be used to determine the maximum size of the overcurrent device. When using an inverse time circuit breaker for a single phase motor, the full load current rating can be multiplied by 250% in order to find the correct size circuit breaker for the application.

Quicksearch: Circuit breakers/ Overcurrent protection/ Motors. 430.52.

d) 250%

Answer 91

A

250.52(A)(7).

Each plate electrode must expose no less than 2 ft2 of surface to exterior soil.

Quicksearch: Plate electrodes. 250.52(A)(7).

The correct answer is: 2 sq. ft.

Answer 92

A

Article 100

defines “special permission” as the written consent of the authority having jurisdiction.

Quicksearch: Permission, special. Article 100.

The correct answer is: Written permission given by the inspection authority.

Answer 93

A

552.41(C).

In park trailers, GFCI protection is required for the following single phase 125 volt 15 and 20 amp receptacles:

(1) Where the receptacles are installed to serve kitchen countertop surfaces
(2) Within 1.8 m (6 ft) of any lavatory or sink
Exception: Receptacles installed for appliances in dedicated spaces, such as for dishwashers, disposals, refrigerators, freezers, and laundry equipment.
(3) In the area occupied by a toilet, shower, tub, or any combination thereof
(4) On the exterior of the unit

Quicksearch: Ground-fault circuit interrupters/ Park trailers. 552.41(C).

The correct answer is: Where the receptacle is installed within 6 ft. of a sink.

Answer 94

A

505.9(B)(1).

Equipment that is listed for a Zone 0 location shall be permitted in a Zone 1 or Zone 2 location of the same gas or vapor, provided that it is installed in accordance with the requirements for the marked type of protection.

Quicksearch: Hazardous (classified) locations, Class I, Zone 0, 1, and 2 locations/ Equipment construction. 505.9.

The correct answer is: It can also be used in a Zone 1 or Zone 2 location of the same gas or vapor.

Answer 95

A

250.52(A)(1).

For an underground metal water piping system to be considered a grounding electrode, it must be in direct contact with the earth for at least ten feet.

Quicksearch: Electrodes, grounding/ Metal water piping system. 250.52(A)(1).

The correct answer is: It must be in contact with the earth for at least 10 feet.

Answer 96

A

408.54.

A panelboard shall be provided with physical means to prevent the installation of more overcurrent devices than that number for which the panelboard was designed, rated, and listed.

Quicksearch: Circuit breakers/ Panelboards. 408.54.

The correct answer is: As many as it has been designed, rated, and listed to contain.

Answer 97

A

400.6(B).

Special characteristics of flexible cords and cables listed in Table 400.4 are permitted to be surface marked on the cord or cable. These are not mandatory markings. These markings include, but are not limited to, markings for limited smoke, sunlight resistance, and so forth.

Quicksearch: Cords/ Marking. 400.6.

The correct answer is: Sunlight resistant.

Answer 98

A

368.10(C)(1).

Bussways can only be installed through walls in unbroken lengths.

Quicksearch: Busways/ Extension through walls and floors. 368.10(C).

The correct answer is: It must be in an unbroken length.

Answer 99

A

404.2(C).

Grounded conductors are required at each switch location where lighting loads are controlled unless the installation matches one of the conditions listed in 404.2(C)(1)-(7).

Quicksearch: Connections/ Switches. 404.2.

The correct answer is: A grounded conductor.

Answer 100

A

422.31(A).

For permanently connected appliances rated at not over 300 volt-amperes or 1∕8 hp, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable in accordance with 110.25.

Quicksearch: Appliances/ Disconnecting means. 422-III.

The correct answer is: The branch-circuit overcurrent device shall be permitted to serve as the disconnecting means if within sight of or lockable.

Answer 101

A

210.62.

At least one receptacle outlet shall be installed within 450 mm (18 in.) of the top of a show window for each 3.7 linear m (12 linear ft) or major fraction thereof of show window area measured horizontally at its maximum width.

Quicksearch: Show windows/ Receptacles. 210.62.

The correct answer is: 18 inches of the top of a show window.

Answer 102

A

110.59.

Enclosures for use in tunnels shall be dripproof, weatherproof, or submersible as required by the environmental conditions.

Quicksearch: Tunnels/ Installations over 600 volts, nominal. 110-IV.

The correct answer is: One that is dust tight.

Answer 103

A

600.5(B)(1).

Branch circuits that supply neon tubing installations shall not be rated in excess of 30 amperes.

Quicksearch: Signs/ Branch circuits. 600.5.

The correct answer is: 30 amps.

Answer 104

A

760.53(A)(3).

Requires cables in a hoistway to be installed in RMC, RNC, IMC, LFNC or EMT.

Quicksearch: Fire alarm systems/ Nonpower-limited circuits/ Multiconductor cable. 760.53.

The correct answer is: In rigid metal conduit.

Answer 105

A

250.119.

Has different requirements for proper equipment grounding conductor identification depending on the size of the conductor. For No. 6 AWG and smaller, the conductor cannot be re-identified at the time of installation by tape or other means. If the No. 6 AWG or smaller conductor is insulated, it shall have a continuous outer finish that is either green or green with one or more yellow stripes. If it is size 4 AWG or larger then taping or re-identifying the conductor where it is accessible is permitted.

Quicksearch: Equipment grounding conductors/identification. 250.119.

The correct answer is: Green conductor insulation with a yellow stripe.

Answer 106

A

210.52(C)(5).

Receptacle outlets shall be located on or above, but not more than 500 mm (20 in.) above, the countertop.

Quicksearch: Countertops, outlets. 210.52(C).

The correct answer is: 20 inches above the counter.

Answer 107

A

430.22.

Motors used in a continuous duty application must be supplied by conductors that are rated for at least 125% of the motor full load current.

Quicksearch: Motors/ Conductors/ Continuous duty. 430.22.

The correct answer is: 125% of the motor full load current.

Answer 108

A

430.28.

Tap conductors can never be smaller than branch circuit conductors. The minimum ampacity of the branch circuit conductors for the 5 HP motor is 30.8 amps x 125% = 38.5 amps. A No. 8 THWN conductor is required. From Table 310.15(B)(16), a No. 8 THWN conductor can carry 50 amps. To meet condition (1) of 430.28, the ampacity of the tap conductors cannot be smaller than 1/10 the rating of the feeder overcurrent device, in this case 15 amps for the 150 amp overcurrent device. For a 10 ft. feeder tap, select a conductor that will meet condition (1) of 430.28 and not be smaller than the branch circuit conductor. In this case a No. 8 THWN is required.

Quicksearch: Motors/ Branch Circuits/ Taps. 430.28.

The correct answer is: No. 8 AWG THWN.

Answer 109

A

210.4.

Multiwire branch circuits must originate from the same panelboard.

Multiwire branch circuits must be disconnected simultaneously.

Multiwire branch circuits can be used for different voltages.

The ungrounded and grounded conductors of a multiwire branch circuit must be grouped in the enclosure as required by 210.4(D).

Quicksearch: Multiwire branch circuit. 210.4.

The correct answer is: All conductors must originate from the same panelboard.

Answer 110

A

110.27.

Live parts of electrical equipment operating at 50 volts or more must be guarded against accidental contact.

Quicksearch: Guarding, guards/ Live parts/ General. 110.27.

The correct answer is: Live electrical parts operating at 55 volts.

Answer 111

A

230.95.

Each service disconnect rated 1000 amps or more requires ground-fault protection of equipment. This applies to solidly grounded wye electrical services where the voltage to ground is more than 150 volts and the phase to phase voltage is not more than 600 volts.

Quicksearch: Ground-fault protection/ Service disconnecting means. 230.95.

The correct answer is: A 1,200 amp 480 volt circuit breaker used as a service disconnect.

Answer 112

A

285.25.

Type 3 SPDs (TVSSs) are permitted to be installed on the load side of branch-circuit overcurrent protection up to the equipment served.

Quicksearch: Surge-protective devices (SPDs). Article 285.

The correct answer is: On the load side of branch-circuit overcurrent protection up to the equipment served.

Answer 113

A

Article 100

defines a fitting as an accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function.

Quicksearch: Fittings/ Definition. Article 100.

The correct answer is: Bonding jumper.

Answer 114

A

250.30(A)(6)(a)(1)

allows a common grounding electrode conductor (GEC) to bond multiple separately derived systems. This common GEC must be at least a 3/0 AWG cu. conductor or the metal frame of a building that is connected to the grounding electrode system by at least a 3/0 AWG cu. conductor.

Quicksearch: Grounding electrode conductors/ Separately derived systems. 250.30.

The correct answer is: At least 3/0 AWG copper.

Answer 115

A

314.16(B)(2).

If one or more internal cable clamps are present in the box, a single volume allowance in accordance with Table 314.16(B) shall be made based on the largest conductor present in the box.

Quicksearch: Clamp fill, boxes. 314.16(B)(2).

The correct answer is: 1.

Answer 116

A

411.6(C).

According to 411.6(C), exposed bare conductors and current carrying parts shall be permitted for indoor installations only. Bare conductors shall not be installed less than 2.1 m (7 ft) above the finished floor, unless specifically listed for a lower installation height.

Quicksearch: Bare conductors/ Lighting systems operating at 30 volts or less. 411.6(C).

The correct answer is: Used for indoor installations only.

Answer 117

A

210.52(C)(2).

At least one receptacle is required for each island countertop space with a long dimension of 600 mm (24 in.) or greater and a short dimension of 300 mm (12 in.) or greater.

Quicksearch: Countertop Outlets. 210.52(C).

The correct answer is: 1.

Answer 118

A

690.2.

PV source circuits are the conductors between modules, and from modules to the common connection point(s) of the dc system.

Quicksearch: Circuits/ Photovoltaic source. 690.1.

The correct answer is: Circuits from PV modules to the common connection point of the dc system.

Answer 119

A

404.8(B).

A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed 300 volts, or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices.

Quicksearch: Boxes (outlet, device, pull, and junction)/ Snap switches over 300 volts, not ganged. 404.8(B).

The correct answer is: A divider to separate the switches if they are both supplied by different phases.

Answer 120

A

250.119.

Section 250.119 has different requirements for proper equipment grounding conductor identification depending on the size of the conductor. For No. 6 AWG and smaller, the conductor cannot be re-identified at the time of installation by tape or other means. If the No. 6 AWG or smaller conductor is insulated, it shall have a continuous outer finish that is either green or green with one or more yellow stripes. If it is size 4 AWG or larger then taping or re-identifying the conductor where it is accessible is permitted.

Quicksearch: Equipment grounding conductors/identification. 250.119.

The correct answer is: Green conductor insulation with a yellow stripe.

Answer 121

A

210.21(A).

According to 210.21(A), if connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. A heavy-duty lampholder shall have a rating of not less than 660 watts if of the admedium type, or not less than 700 watts if of any other type.

Tag 1: Wiring and Protection. Tag 2: Branch Circuits.

Quicksearch: Heavy-duty lampholders/ Branch circuits. 210.21(A).

The correct answer is: 20 amps.

Answer 122

A

411.5(B).

Unless specifically permitted in article 680, a low voltage lighting system operating at 30 volts or less cannot be closer than 10 feet to the edge of a pool, spa, fountain or similar area.

Quicksearch: Lighting systems, 30 volts or less/ Location requirements. 411.5.

The correct answer is: 10 feet.

Answer 123

A

Table 250.66.

Two parallel sets of 500 kCMIL aluminum conductors has the combined area of a 1,000 kCMIL conductor. Table 250.66 requires a 2/0 AWG copper grounding electrode conductor for 1,000 kCMIL aluminum service conductors.

Quicksearch: Jumpers, bonding/ Main. 250.28.

The correct answer is: 2/0 AWG.

Answer 124

A

240.60(D).

Class H cartridge fuses of the renewable type shall be permitted to be used only for replacement in existing installations where there is no evidence of overfusing or tampering.

Quicksearch: Cartridge fuses. 240–VI.

The correct answer is: For replacement in existing installations where there is no evidence of overfusing or tampering.

Answer 125

A

210.70(A)(1) Exception 2.

Exception No. 2: Lighting outlets shall be permitted to be controlled by occupancy sensors that are (1) in addition to wall switches or (2) located at a customary wall switch location and equipped with a manual override that will allow the sensor to function as a wall switch.

Quicksearch: Lighting outlets. 210.70.

The correct answer is: When the occupancy sensor is located at the normal wall switch location and is equipped with a manual override function.

Answer 126

A

590.3(D).

Temporary wiring is required to be removed immediately upon completion of construction or the purpose for which the wiring was installed.

Quicksearch: Temporary Installations/ Time constraints. 590.3.

The correct answer is: All temporary wiring must be removed immediately upon completion of construction.

Answer 127

A

250.53(G).

Section 250.53(G) allows the ground rod to placed horizontal at an angle up to 45 degrees if rock bottom is encountered . In this type of installation, the electrode must be buried in a trench that is at least 30 inches deep.

Quicksearch: Rod electrodes. 250.53.

The correct answer is: 30 inches.

Answer 128

A

410.10(D).

The area 3 ft. horizontally and 8 ft. vertically from the top of the bathtub rim or shower stall threshold is not permitted to contain cord connected luminaires, chain or cable suspended luminaires, ceiling fans or track lights.

Quicksearch: Bathtubs/ Luminaires. 410.10(D).

The correct answer is: It must be at least 3 feet horizontally and 8 feet vertically from the top of the bathtub rim.

Answer 129

A

460.6(B).

The discharge circuit shall be either permanently connected to the terminals of the capacitor or capacitor bank or provided with automatic means of connecting it to the terminals of the capacitor bank on removal of voltage from the line. Manual means of switching or connecting the discharge circuit shall not be used.

Quicksearch: Capacitors/ Means for discharge. 460.6.

The correct answer is: Manual means of switching or connecting the discharge circuit shall not be used.

Answer 130

A

250.30(A)(6)(a)(1).

Section 250.30(A)(6) allows a common grounding electrode conductor (GEC) to bond multiple separately derived systems. This common GEC must be at least a 3/0 AWG cu. conductor or the metal frame of a building that is connected to the grounding electrode system by at least a 3/0 AWG cu. conductor.

Quicksearch: Grounding electrode conductors/ Separately derived systems. 250.30.

The correct answer is: At least 3/0 AWG copper.

Answer 131

A

427.18(B).

Nonheating power supply leads shall be protected where they emerge from electrically heated pipeline or vessel heating units by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or other raceways identified as suitable for the application.

Quicksearch: Fixed electric heating equipment for pipelines and vessels/ Resistance heating elements/ Power supply leads. 427.18.

The correct answer is: Electrical metallic tubing.

Answer 132

A

692.8(A).

According to 692.8(A), the nameplate rated circuit current shall be the rated current indicated on the fuel cell nameplate.

Quicksearch: Fuel cell systems/ Circuit sizing. 692.8.

The correct answer is: The rated current indicated on the fuel cell nameplate.

Answer 133

A

800.100(A)(4).

The primary protector bonding conductor or grounding electrode conductor shall be as short as practicable. In one- and two-family dwellings, the primary protector bonding conductor or grounding electrode conductor shall be as short as practicable, not to exceed 6.0 m (20 ft) in length.

Quicksearch: Communications circuits/ Bonding. 800.100(A).

The correct answer is: 20 feet in length.

Answer 134

A

430.52(C)(1) exception 2.

If the rating of the OCPD is insufficient to start the motor, exception 2(b) states that the rating of a time-delay (dual-element) fuse can be increased but shall in no case exceed 225 percent of the full-load current.

Quicksearch: Motors/ Overcurrent protection/ Branch circuits. 430-IV.

The correct answer is: 225% of the motor full load current.

Answer 135

A

230.79(B).

For installations consisting of not more than two, 2-wire branch circuits, the service disconnecting means shall have a rating of not less than 30 amperes.

Quicksearch: Service equipment/ Rating. 230.79.

The correct answer is: 30 amps.

Answer 136

A

Table 310.15(B)(17).

See Table 310.15(B)(17) for a type THWN conductor used in free air. The No. 1 AWG cu. conductor is rated for 195 amps and there is no ambient temperature correction factor required.

Quicksearch: Conductors/ In free air Tables. 310.15(B)(17).

The correct answer is: 195 A.

Answer 137

A

Article 100 definitions.

According to the definition in article 100, a system or circuit conductor that is intentionally grounded is a grounded conductor.

Quicksearch: Conductors/ Grounded/ Definition. Article 100.

The correct answer is: Is intentionally grounded.

Answer 138

A

314.16.

Three 12-2 cables = 6 insulated conductors. Count one more for all of the equipment grounds combined. Two allowances per switch or receptacle. Total of 11 conductor allowances. 11 X 2.25 in.3 = 24.75 in3.

Quicksearch: Boxes/ Conductors, number in box. 314.16.

The correct answer is: 24.75 in.³.

Answer 139

A

Table 210.21(B)(2).

According to Table 210.21(B)(2), the maximum load permitted on a 30 amp branch circuit is 24 amps which is 80% of the 30 amp branch circuit.

Quicksearch: Receptacles/ Maximum cord and plug connected load to. Table 210.21(B)(2).

The correct answer is: 24 amps.

Answer 140

A

110.14(C).

Since the terminals are only rated for 75°C, the 90°C rating of the THWN-2 conductor from Table 310.15(B)(16) cannot be used. A 1/0 cu. conductor from the 75°C column of the Table is rated for 150 amps.

Quicksearch: Connections/ Temperature limitations. 110.14(C).

The correct answer is: 150 amps.

Answer 141

A

725.49(B).

Section 725.49(B) specifies the permitted conductor insulation types allowed to be used on Class 1 circuit conductors. Conductors in sizes 18 AWG and 16 AWG shall be Type FFH-2, KF-2, KFF-2, PAF, PAFF, PF, PFF, PGF, PGFF, PTF, PTFF, RFH-2, RFHH-2, RFHH-3, SF-2, SFF-2, TF, TFF, TFFN, TFN, ZF, or ZFF.

Quicksearch: Remote-control, signaling, and power-limited circuits/ Class 1 circuits/ Conductors. 725.49.

The correct answer is: ZFF.

Answer 142

A

220.43(A).

According to 220.43(A), a load of not less than 660 volt-amperes/linear meter or 200 volt amperes/ linear foot shall be included for a show window, measured horizontally along its base.

Quicksearch: Show windows/ Feeders. 220.43(A).

The correct answer is: 200 VA per linear foot.

Answer 143

A

314.28(A)(2).

Where splices or where angle or U pulls are made, the distance between each raceway entry inside the box or conduit body and the opposite wall of the box or conduit body shall not be less than six times the trade size of the largest raceway in a row. This distance shall be increased by the amount of the sum of the diameters of all other raceway entries in the same row on the same wall of the box.

[3 inch conduit x 6] + 2 inch conduit = 20 inches x 20 inches.

QuickSearch: Pull Boxes/ Sizes/ 4 AWG and Larger Conductors. 314.28(A).

The correct answer is: 20 inches x 20 inches.

Answer 144

A

Table 220.56

14 kW oven + 5 kW microwave + 8 kW mixer = 27 kW.

27 kW x .90 = 24.3 kW.

24.3 kW / 240 Volts = 101.25 amps.

The number of units of equipment in this kitchen is 3. In the right-hand column, the demand factor % is 90.

The correct answer is: 101.25 amps.

Answer 145

A

Table 402.5

From Table 402.5, Allowable Ampacity of Fixture Wires, the allowable ampacity for a No. 16 AWG fixture wire is 8 amps.

The correct answer is: 8 amps.

Answer 146

A

Chapter 9, Table 5

Using Table 5, Chapter 9, the approximate sq in area for a THHW conductor is .0139.

The correct answer is: .0139 square inches.

Answer 147

A

310.15(B)(7)

For services rated 100-400 amps if the service-entrance conductors or a feeder carry the entire load of the dwelling, multiply the service rating and multiply by 83%.

200 amps x 83% = 166 amps. Select a conductor size from Table 310.15(B)(16). 2/0 copper.

The correct answer is: 2/0 AWG copper

Answer 148

A

240.83

The key word is circuit breakers.

The index entry is: Circuit breakers/markings. 240.83.

The correct answer is: When they are listed and marked SWD or HID.

Answer 149

A

Table 220.42

Type of Occupancy is a Hotel.

1st 20,000 VA at 50% = 10,000 VA.

From 20,001 to 100,000 at 40%. 80,000 VA x 40% = 32,000 VA.

Remaining 100,000 VA at 30% = 30,000.

10,000 VA + 32,000 VA + 30,000 VA = 72,000 VA.

The correct answer is: 72,000 VA.

Answer 150

A

332.24

The keyword is Mineral Insulated Cable. The Index entry is Mineral Insulated Cable / Bends / 332.24.

The correct answer is: 3 ¾ inches.

Answer 151

A

210.8

The keyword is Ground Fault Circuit Interrupter. The index entry is GFCI / permitted uses / 210.8.

The correct answer is: Bedrooms.

Answer 152

A

Table 220.55

6 ranges x 5 kW each = 30 kW.

30 kW x .43 = 12.9 kW

The number of appliances is 6. Use Column B, 3.5 kW through 9 ¾ kW rating. The demand factor % in column B is 43.

The correct answer is: 12.9 kW.

Answer 153

A

Two forms of hazardous electrical energy control shall be permitted: simple lockout/tagout and complex lockout/tagout.

The correct answer is: Simple and complex.

Answer 154

A

NFPA 70E article 100 definition of arc flash boundary.

Boundary, Arc Flash. When an arc flash hazard exists, an approach limit at a distance from a prospective arc source within which a person could receive a second degree burn if an electrical arc flash were to occur.

The correct answer is: Arc flash boundary.

Answer 155

A

P. 58 Cal/OSHA Pocket Guide.

A personal fall arrest (PFA) system must be rigged such that an employee can neither free fall more than 6 feet, nor contact any lower level, and, where practicable, the anchor end of the lanyard shall be secured at a level not lower than the employee’s waist.

The correct answer is: 6 feet.

Answer 156

A

P. 91 Portable Ladders

To safely use portable ladders employees must not stand and work on the top three rungs of a single or extension type ladder.

The correct answer is: Workers should not stand and work on the top three rungs of an extension ladder.

Answer 157

A

P. 57. Cal/OSHA Pocket Guide.

According to the OSHA pocket guide, a personal fall restraint (PFR) system is used to prevent an employee from falling. It consists of anchorages, connectors, and a body belt or harness. It may include lanyards, lifelines, and rope grabs designed for that purpose.

The correct answer is: Prevent an employee from falling.

Answer 158

A

CAL/OSHA guide page 59.

Safety nets may be used in place of all other fall protection systems if the nets are installed properly.

The correct answer is: A safety net.

Answer 159

A

NFPA 70E article 100 definition of arc flash boundary.

Boundary, Arc Flash. When an arc flash hazard exists, an approach limit at a distance from a prospective arc source within which a person could receive a second degree burn if an electrical arc flash were to occur.

The correct answer is: Arc flash boundary.

Answer 160

A

P. 58 Cal/OSHA Pocket Guide.

A personal fall arrest (PFA) system must be rigged such that an employee can neither free fall more than 6 feet, nor contact any lower level, and, where practicable, the anchor end of the lanyard shall be secured at a level not lower than the employee’s waist.

The correct answer is: 6 feet.

Answer 161

A

P. 91 Portable Ladders

To safely use portable ladders employees must not stand and work on the top three rungs of a single or extension type ladder.

The correct answer is: Workers should not stand and work on the top three rungs of an extension ladder.

Answer 162

A

Annex C.

1 1/2 inches.

Annex C can be used to determine the maximum number of conductors that can be installed in a conduit if all of the conductors are the same size and insulation type. Table C.1 in Annex C is specific to conductors installed in electrical metallic tubing.

Quicksearch: Electrical metallic Tubing (Type EMT)/ Maximum number of conductors and fixture wires in. Tables C.1 and C.1(A).

The correct answer is: 1 ½ inch.

Answer 163

A

230.24(B)(2).

Section 230.24(B)(2) requires at least 12 feet for service conductors over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground.

Quicksearch: Clearances/ Conductors/ Overhead service. 230.24.

The correct answer is: 12 feet.

Answer 164

A

424.3(B).

10,000 amps ÷ 360 volts (208 volts x 1.73) = 27.77 amps. 27.77 amps x 125% = 34.72 or 35 amps.

Section 424.3(B) states that fixed electric space heating is considered a continuous load for the purpose of sizing branch circuits. Section 210.19(A)(1) requires branch circuits supplying continuous loads to be sized based on 125% of the continuous load.

Quicksearch: Branch circuits/ Fixed electric space heating equipment. 424.3.

The correct answer is: 35 amps.

Answer 165

A

314.16.

Two 14-3 cables and two 14-2 cables = 10 insulated conductors. Count one more for all of the equipment grounds combined. One allowance for internal cable clamps regardless of how many. Two allowances per switch or receptacle. Total of 16 conductor allowances. If trying to determine cubic inch of the above conductors, multiply 2 cubic inches X 14 conductors.

Quicksearch: Boxes/ Conductors, number in box. 314.16.

The correct answer is: 16.

Answer 166

A

15(B)(3)(c).
(c) Raceways and Cables Exposed to Sunlight on Rooftops. Where raceways or cables are exposed to direct sunlight on or above rooftops, raceways or cables shall be installed a minimum distance above the roof to the bottom of the raceway or cable of 23 mm (7∕8 in.). Where the distance above the roof to the bottom of the raceway is less than 23 mm (7∕8 in.), a temperature adder of 33°C (60°F) shall be added to the outdoor temperature to determine the applicable ambient temperature for application of the correction factors in Table 310.15(B)(2)(a) or Table 310.15(B)(2)(b).

Quicksearch: Roofs, conduits exposed to sunlight on. 310.15(B)(3)(c).

The correct answer is: 0°F.

Answer 167

A

314.16.

Two 12-3 cables and one 12-2 cable = 8 insulated conductors. Count one more for all of the equipment grounds combined. One allowance for internal cable clamps regardless of how many. Two allowances per switch or receptacle. Total of 14 conductor allowances. If trying to determine cubic inch of the above conductors, multiply 2.25 X 14 conductors.

Quicksearch: Boxes/ Conductors, number in box. 314.16.

The correct answer is: 14.

Answer 168

A

220.52(A), and (B).

Each 2-wire kitchen and laundry branch circuit shall be calculated at 1,500 VA. Section 210.11(C)(1) and 210.11(C)(2) requires each dwelling to have two kitchen small appliance branch circuits and one laundry branch circuit. 3 X 1,500 VA = 4,500 VA.

Quicksearch: Appliances/ Load calculations. 220.52.

The correct answer is: 4,500 VA.

Answer 169

A

310.15(B)(2)(a).

The .82 correction factor is selected from Table 310.15(B)(2)(a) based on the 90° C column. The 95 amp value can be used from Table 310.15(B)(16) in the 90°C column for the purpose of derating the conductor. 95 amps X .82 = 77.9 amps.

Quicksearch: Ambient temperature. Table 310.15(B)(2)(a).

The correct answer is: 77.9 amps.

Answer 170

A

Table 220.44.

See Table 220.44. The portion of the receptacle load above 10,000 VA in other than dwelling units can be calculated at 50%.

Quicksearch: Loads/ Feeders, calculations for. Article 220.

The correct answer is: 50%.

Answer 171

A

Table 250.66.

Three parallel sets of 300 kCMIL copper conductors has the combined area of a 900 kCMIL conductor. Table 250.66 requires a 2/0 AWG copper grounding electrode conductor for 900 kCMIL copper service conductors.

Quicksearch: Jumpers, bonding/ Main. 250.28.

The correct answer is: 2/0 AWG.

Answer 172

A

210.23(A)(2).

Section 210.23(A)(2) covers utilization equipment such as waste disposers and other equipment that is fastened in place, whether cord-and-plug-connected or hard wired. If the circuit supplies additional loads beyond the fastened in place equipment, then the fastened in place utilization equipment cannot exceed 50% of the branch circuit rating.

Quicksearch: Branch circuits/ Appliances. 210.23.

The correct answer is: 10 A.

Answer 173

A

Table 210.21(B)(3).

According to Table 210.21(B)(3), a 20 amp branch circuit is permitted to supply a 15 amp or 20 amp rated receptacle.

Quicksearch: Receptacles/ Ratings for various size circuits. Table 210.21(B)(3).

The correct answer is: A 20 ampere branch circuit can supply a 15 ampere receptacle.

Answer 174

A

Table 220.12.

See Table 220.12. The lighting load for a bank is calculated at 3.5 VA/ft2.

Quicksearch: Occupancy, lighting loads. Table 220.12.

The correct answer is: 3.5 VA/ft2.

Answer 175

A

Table 312.6(A).

See Table 312.6(A) which is for wiring that does not enter the enclosure opposite its terminal.

Quicksearch: Cabinets, cutout boxes, and meter socket enclosures/ Deflection of conductors. 312.6.

The correct answer is: 4 inches.

Answer 176

A

Annex C.

1 1/4 inch.

Annex C can be used to determine the maximum number of conductors that can be installed in a conduit if all of the conductors are the same size and insulation type. Table C.3 in Annex C is specific to conductors installed in flexible metal conduit.

Quicksearch: Flexible metal conduit (Type FMC) Maximum number of conductors and fixture wires in Tables C3 and C3A.

The correct answer is: 1 ¼ inch.

Answer 177

A

210.52(E)(1).

For a one family dwelling and each unit of a two-family dwelling that is at grade level, at least one receptacle outlet is required at the front and back of the dwelling.

Quicksearch: Dwellings/Receptacle outlets required/ 210.52.

The correct answer is: 2.

Answer 178

A

430.24.

According to 430.24, when several motors are supplied by the same feeder, the full load current from the largest motor is multiplied by 125% and then the result is added to the sum of the full load current values of the remaining motors. 28 A X 125% + 17 + 12 = 64 A.

Quicksearch: Motors/ Several motors. 430.24.

The correct answer is: 64 amps.

Answer 179

A

110.26(A)(2).

The minimum work space width for electrical equipment that is likely to be examined while energized is the width of the equipment or 30 inches, whichever is greater.

Quicksearch: Working space/ About electrical equipment. 110.26.

The correct answer is: 32 inches.

Answer 180

A

240.24(A).

Overcurrent devices shall be readily accessible and shall be installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in the highest position, is not more than 6 ft. 7 inches above the floor or working platform.

Quicksearch: Overcurrent protection/ Location. 240-II.

The correct answer is: 6 ft. 7 inches.

Answer 181

A

440.62(B).

If no other loads are supplied, the total marked rating of a cord-and-attachment-plug-connected room air conditioner shall not exceed 80 percent of the rating of a branch circuit.

Quicksearch: Air conditioners, room/ Branch-circuit requirements. 440.62.

The correct answer is: 16 amps.

Answer 182

A

The luminaire schedule for a set of plans is usually on the electrical lighting page. Most sets of plans will have at least one page for lighting, one power plan page for receptacles and utilization equipment and a single line/riser diagram.

The correct answer is: Luminaire schedule.

Answer 183

A

110.15 High-Leg Marking.

Identification/High-Leg/110.15

The correct answer is: Orange

Answer 184

A

110.14(C)(1) Termination provisions for equipment rated 100 amperes or less or marked for 14 AWG through 1 AWG are rated for use with 60’C conductors unless listed and marked for use with higher temperature rated conductors.

The correct answer is: 60’C

Answer 185

A

110.26(A)(2) Width of Working space.

Working space/about electrical equipment/110.26

The correct answer is: 42 in.

Working space shall be width of equipment or 30” whichever is greater.

Answer 186

A

110.26(C)(2).

For equipment rated 1200 amperes or more and over six feet wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance to and egress from the required working space not less than 24 inches wide and 6½ high at each end of the working space.

Quicksearch: Working space/About electrical equipment. 110.26.

The correct answer is: If the equipment is rated 1200 amperes and is over 6 ft. wide.

Answer 187

A

110.26(A)(1) Where the voltage to ground does not exceed 150-volts, the minimum depth of working space is 3 ft.

Working space/about electrical equipment/110.26

The correct answer is: 3 ft.

Answer 188

A

110.26(E)(1).

The space equal to the width and depth of the equipment and extending to a height of 6 feet above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation.

Quicksearch: Equipment/Installation, general provisions. 110.

The correct answer is: The space equal to the width and depth of the equipment and extending from the floor to a height of 6 feet above the equipment or to the structural ceiling, whichever is lower.

Answer 189

A

See Table 110.26(A)(1) Condition 2 applies concrete, brick, and tile walls are considered grounded surfaces.

Working space/about electrical equipment/110.26

The correct answer is: Condition 2

Answer 190

A

Table 110.28.

Enclosures . . . rated not over 600 volts, nominal . . . shall be marked with an enclosure-type number as shown in Table 110.28.

Quicksearch: Enclosures/Indoor use, for. Table 110.28.

The correct answer is: 6 and 6P.

Answer 191

A

110.24.

Service equipment in other than dwelling units shall be legibly marked in the field with the maximum available fault current. The field marking(s) shall include the date the fault-current calculation was performed and be of sufficient durability to withstand the environment involved. The calculation shall be documented and made available to those authorized to design, install, inspect, maintain, or operate the system.

Quicksearch: Marking 110.21.

The correct answer is: Service equipment in other than dwelling units.

Answer 192

A

314.20

The key word is “box”. The Index entry is Boxes / Concealed work / 314.20.

The correct answer is: Not more than 1/4 inch.

Answer 193

A

Table 610.14(A)

Up to four simultaneously energized THWN No. 8 conductors in conduit that are energized for 30 minutes are rated at 60 amps.

The correct answer is: 60 amps.

Answer 194

A

Table 310.15(B)(3)(a).

130 amps x 80% = 104 amps.

When the number of conductors in a raceway is between 4-6, adjust the ampacity in Table 310.15(B)(16) by 80%.

The correct answer is: 104 amps.

Answer 195

A

Table 300.5

Using Table 300.5, select Column 4 for Residential Branch Circuits. Since the location of the circuit does not match any item in the “Location of Wiring Method or Circuit,” select, “All locations not specified below” which is 12 inches.

The correct answer is: 12 inches.

Answer 196

A

374.20

The key words are “Cellular Metal Floor Raceways.” The Index entry is Cellular Metal Floor Raceways / Size of Conductors / 374.20.

The correct answer is: 1/0 AWG.

Answer 197

A

225.6(B)

The key word is “Festoon lighting”. The Index entry is Festoon Lighting / Conductor Size / 225.6(B).

The correct answer is: No smaller than No. 12 AWG.

Answer 198

A

Table 314.16(B)

Select the conductor size in Table 314.16(B). The allowance required is indicated in the same row. For No. 12 AWG conductors the required space is 2.25 inches.

The correct answer is: 2.25 cu. in.

Answer 199

A

Table 220.44

1st 10,000 VA at 100% = 10,000 VA.

Remainder over 10,000 VA at 50% = 15,000 VA at 50% = 7,500 VA.

10,000 VA + 7,500 VA = 17,500 VA.

The correct answer is: 17,500 VA.

Answer 200

A

Table 250.66

For Copper 1/0 conductors the size of copper grounding electrode conductor is No. 6 AWG.

Copper conductors are on the far left hand side of the column. Locate the row with the correct size of conductor and move right to find the column for copper grounding electrode conductor.

The correct answer is: No. 6 AWG.

Answer 201

A

Table 514.3(B)(1)

From Table 514.3(B)(1) the space within the enclosure of an overhead type dispensing device is classified as Class 1 Division 1.

The correct answer is: Class 1 Division 1

Answer 202

A

Table 430.250

Table 430.250 provides the value in amperes of 3-phase motors. The row for 2 horsepower motors under the column for 208 Volts is 7.5 amps.

The correct answer is: 7.5 amps.

Answer 203

A

630-III.

100 amps x 300% = 300 amps

Welders, electric/Resistance.

630-III. 630-III refers to Article 630, Part 3.

630.32(A)

The correct answer is: 300 amps.

Answer 204

A

Table 312.6(B)

Use the far left column on Table 312.6(B). The second column is for compact stranded aluminum alloy conductors. A 1/0 AWG conductor requires 5 ½ inches of wire bending space. Table 312.6(B) is used when the conductor enters or leaves the enclosure on the wall opposite the terminal.

The correct answer is: 5 ½ inches.

Answer 205

A

Table 430.248

From Table 430.248, a ½ hp, 115 volt, single phase motor is rated at 9.8 amps.

The correct answer is: 9.8 amps.

Answer 206

A

Table 210.24

20 amps x .80 = 16 amps.

From Table 210.24, the “Permissible Load” row, for the 20 amp column, says “See 210.23(A).”

210.23(A). Cord-and-Plug-Connected Equipment Not Fastened in Place. The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch-circuit ampere rating.

The correct answer is: 16 amps.

Answer 207

A

220.14(G)

The key words are “Show Window Lighting”. The Index entry is Show Windows / Branch Circuits / 220.14(G).

The correct answer is: 200 watts.

Answer 208

A

Table 220.84

825,000 VA x .35 = 288,750

The left-hand column is Number of Dwelling Units. Select the 24-25 row. The Demand Factor % is 35.

The correct answer is: 288,750 VA.

Answer 209

A

Key terms Mobile home and service equipment

Mobile homes/Service equipment/550.32

The correct answer is: 30 ft.

Answer 210

A

Table 110.26(A)(1)

Nominal voltage to ground is less than 150 volts. Condition 2 applies: Exposed live parts on one side of the working space and grounded parts on the other side of the working space. Concrete, brick, or tile walls shall be considered as grounded.

The correct answer is: 3 ft.

Answer 211

A

Chapter 9, Table 4

From Table 4, Chapter 9, locate the table that applies to Article 352 for schedule 80 PVC. For 2 inch PVC Schedule 80 PVC, from the over 2 wires column, the in2 permitted area is 1.150 in2.

The correct answer is: 1.150 in2.

Answer 212

A

680.43

The key word is hot tub.

The index entry is: Spas and Hot Tubs/indoor installations.

The correct answer is: 5 ft.

Answer 213

A

220.14(H).

Multioutlet assembly/calculation of load.

180 VA for each 5 ft. of multioutlet strip, if not used simultaneously. If length is 6 ft. then 360 VA required, because the extra ft. is a fraction of 5 ft.

The correct answer is: 360 volt-amps.

Answer 214

A

110.13

The keyword is “Mounting of equipment”. The Index entry is Equipment Mounting (See Mounting of Equipment) / 110.13.

The correct answer is: Both I and II.

Answer 215

A

430.24.

According to 430.24, when several motors are supplied by the same feeder, the full load current from the largest motor is multiplied by 125% and then the result is added to the sum of the full load current values of the remaining motors. 28 A X 125% + 17 + 12 = 64 A.

Quicksearch: Motors/ Several motors. 430.24.

The correct answer is: 64 amps.

Answer 216

A

310.15(B)(2)(a).

The .82 correction factor is selected from Table 310.15(B)(2)(a) based on the 90° C column. The 95 amp value can be used from Table 310.15(B)(16) in the 90°C column for the purpose of derating the conductor. 95 amps X .82 = 77.9 amps.

Quicksearch: Ambient temperature. Table 310.15(B)(2)(a).

The correct answer is: 77.9 amps.

Answer 217

A

Table 312.6(A).

See Table 312.6(A) which is for wiring that does not enter the enclosure opposite its terminal.

Quicksearch: Cabinets, cutout boxes, and meter socket enclosures/ Deflection of conductors. 312.6.

The correct answer is: 4 inches.

Answer 218

A

210.23(A)(2).

Section 210.23(A)(2) covers utilization equipment such as waste disposers and other equipment that is fastened in place, whether cord-and-plug-connected or hard wired. If the circuit supplies additional loads beyond the fastened in place equipment, then the fastened in place utilization equipment cannot exceed 50% of the branch circuit rating.

Quicksearch: Branch circuits/ Appliances. 210.23.

The correct answer is: 10 A.

Answer 219

A

Table 250.66.

Three parallel sets of 300 kCMIL copper conductors has the combined area of a 900 kCMIL conductor. Table 250.66 requires a 2/0 AWG copper grounding electrode conductor for 900 kCMIL copper service conductors.

Quicksearch: Jumpers, bonding/ Main. 250.28.

The correct answer is: 2/0 AWG.

Answer 220

A

424.3(B).

10,000 amps ÷ 360 volts (208 volts x 1.73) = 27.77 amps. 27.77 amps x 125% = 34.72 or 35 amps.

Section 424.3(B) states that fixed electric space heating is considered a continuous load for the purpose of sizing branch circuits. Section 210.19(A)(1) requires branch circuits supplying continuous loads to be sized based on 125% of the continuous load.

Quicksearch: Branch circuits/ Fixed electric space heating equipment. 424.3.

The correct answer is: 35 amps.

Answer 221

A

310.15(B)(2)(a).

The .82 correction factor is selected from Table 310.15(B)(2)(a) based on the 90° C column. The 95 amp value can be used from Table 310.15(B)(16) in the 90°C column for the purpose of derating the conductor. 95 amps X .82 = 77.9 amps.

Quicksearch: Ambient temperature. Table 310.15(B)(2)(a).

The correct answer is: 77.9 amps.

Answer 222

A

250.66(A).

The portion of the grounding electrode conductor that is the sole connection to a ground rod is never required to be larger than 6 AWG copper or 4 AWG aluminum.

Quicksearch: Rod electrodes. 250.66(A).

The correct answer is: 6 AWG.

Answer 223

A

220.52(A), and (B).

Each 2-wire kitchen and laundry branch circuit shall be calculated at 1,500 VA. Section 210.11(C)(1) and 210.11(C)(2) requires each dwelling to have two kitchen small appliance branch circuits and one laundry branch circuit. 3 X 1,500 VA = 4,500 VA.

Quicksearch: Appliances/ Load calculations. 220.52.

The correct answer is: 4,500 VA.

Answer 224

A

Table 220.12.

See Table 220.12. The lighting load for a bank is calculated at 3.5 VA/ft2.

Quicksearch: Occupancy, lighting loads. Table 220.12.

The correct answer is: 3.5 VA/ft2.

Answer 225

A

312.11(A)(2).

There shall be an airspace of at least 25.4 mm (1 in.) between any live metal part, including live metal parts of enclosed fuses, and the door. According to the exception, this distance can be reduced to ½ inch if the door is insulated or has a thickness of .093 in.

Quicksearch: Cabinets, cutout boxes, and meter socket enclosures/ Construction specifications. 312-II.

The correct answer is: 1 inch.

Answer 226

A

280.3.

According to 280.3, a surge arrester installed on a circuit, shall be connected to each ungrounded conductor.

Quicksearch: Surge arresters. Article 280.

The correct answer is: Each ungrounded conductor.

Answer 227

A

220.87.

According to 220.87, the feeder or service load for existing installations can be determined under the following conditions:

(1) The maximum demand data is available for a 1-year period.
(2) The maximum demand at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service.
(3) The feeder has overcurrent protection in accordance with 240.4, and the service has overload protection in accordance with 230.90.

Quicksearch: Loads/ Feeders, calculations for. Article 220.

The correct answer is: If the maximum demand at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service.

Answer 228

A

314.16.

Three 12-2 cables = 6 insulated conductors. Count one more for all of the equipment grounds combined. Two allowances per switch or receptacle. Total of 11 conductor allowances. 11 X 2.25 in.3 = 24.75 in3.

Quicksearch: Boxes/ Conductors, number in box. 314.16.

The correct answer is: 24.75 in.³.

Answer 229

A

110.14(C)(1)

Termination provisions for equipment rated 100 amperes or less or marked for 14 AWG through 1 AWG are rated for use with 60’C conductors unless listed and marked for use with higher temperature rated conductors.

The correct answer is: 60’C

Answer 230

A

Table 110.28.

Enclosures . . . rated not over 600 volts, nominal . . . shall be marked with an enclosure-type number as shown in Table 110.28.

Quicksearch: Enclosures/Indoor use, for. Table 110.28.

The correct answer is: 6 and 6P.

Answer 231

A

110.26(C)(2).

For equipment rated 1200 amperes or more and over six feet wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance to and egress from the required working space not less than 24 inches wide and 6½ high at each end of the working space.

Quicksearch: Working space/About electrical equipment. 110.26.

The correct answer is: If the equipment is rated 1200 amperes and is over 6 ft. wide.

Answer 232

A

Table 310.15(B)(3)(a).

The correction factor for 8 current-carrying conductors in conduit is .7. 140 amps ÷ .7 = 200 amps. Select a 3/0, 90°C conductor from Table 310.15(B)(16). A 3/0 THHN conductor is rated for 225 amps and is large enough to carry the load.

Explanation: Use the divide-by method to find what size conductor to select when there are more than three current-carrying conductors in conduit. For example, what size conductor, THW cu., is required to supply a 35 amp load when there are 5 current-carrying conductors in conduit?

From Table 310.15(B)(3)(a), the correction factor for 5 current-carrying conductors in the same conduit is .8. Divide the load by .8. 35 amps ÷ .8 = 44 amps. Select a conductor from Table 310.15(B)(16) that is equal to or greater than 44 amps. A No. 6 THW cu. is rated for 65 amps and is large enough to carry the load.

QuickSearch: Conductors / Ampacities of / 310.15.

The correct answer is: 3/0 AWG

Answer 233

A

Table 310.15(B)(2)(a)

Ambient Temperature/Table 310.15(B)(2)(a)

The correct answer is: 0.82

Answer 234

A

210.19. Table 310.15(B)(16).

115 amps x 1.25 = 144 amps

Explanation: A continuous load is a load that operates for 3 hours or more. A continuous load must be calculated at 125% of the connected load (210.19, 215.2, 230.42). For example, the conductors supplying a 40 amp continuous load must be rated for 50 amps (40 x 1.25 = 50 amps). The conductor must be selected from Table 310.15(B)(16) based on the temperature rating of the terminals. If the terminals are rated 75°C then the 75°C column of the Table must be used to select the conductors to supply the continuous load.

QuickSearch: Continuous load / applications / 210.19(A).

The correct answer is: 144 amps.

Answer 235

A

Table 310.15(B)(2)(a).

3/0 THWN-2 cu conductor = 225 amps. Temperature correction factor = .76

225 amps x .76 = 171 amps

Explanation: Once the correction factor is found in Table 310.15(B)(2)(a) it is applied it to the ampacity values in Table 310.15(B)(15) based on the type of conductor that is used. Select the appropriate column in Table 310.15(B)(15) based on the type of conductor, not the rating of the terminals. For example, if a conductor is rated for 90°C and is connected to 75°C terminals, apply the temperature correction factors from Table 310.15(B)(2)(a) to the 90°C column in Table 310.15(B)(16).

QuickSearch: Correction factors, ambient temperature / Tables 310.15(B)(2).

The correct answer is: 171 amps.

Answer 236

A

240.6.

3/0 XHHW Aluminum conductor = 155 amps

Correction factor for 8 current-carrying conductors = 70%

155 amps x .70 = 109 amps

Next standard overcurrent protection device from 240.6 = 110 amps

Explanation: The overcurrent protection for a conductor must be based on the actual ampacity of the conductor, after it has been corrected for ambient temperature or more than three conductors in conduit. For example, if the corrected ampacity of a conductor is 60 amps, that is its actual permitted ampacity and it must be protected at 60 amps.

QuickSearch: Conductors / Ampacities of / 310.15.

The correct answer is: 109 amps ampacity/110 amps overcurrent protection.

Answer 237

A

Table 310.15(B)(16).

The amount of current that a conductor can carry is limited by the size of the conductor and the temperature rating of the insulation of the conductor. Also, the amount of current a conductor can carry is limited by the temperature rating of the terminals that the conductor is connected to. If a conductor is rated for 90°C and the terminal it is connected to is rated for 75°C, the ampacity permitted on the conductor is limited to the 75°C rating from Table 310.15(B)(16).

Section 110.14(C) Temperature Limitations. The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the lowest temperature rating of any connected termination, conductor, or device.

The weak point of any electrical system is where conductors are spliced or terminated. The temperature rating of the insulation on the conductor, which along with the size of the conductor determines how much current it can carry, cannot be greater than the temperature rating of the terminal.

QuickSearch: Conductors / Ampacities of / 310.15.

The correct answer is: 40 amps.

Answer 238

A

Table 310.15(B)(16)

Type THWN is a 75’C rated conductor.

The correct answer is: 205 amperes

Answer 239

A

Table 220.55 Note 3.

6.5 kW + 6.5 kW + 3.5kW + 3.5 kW = 20 kW. Demand factor for 4 appliances = 50%. 20 kW x 50% = 10 kW.

Explanation: Note 3 to Table 220.55 is for ranges over 1 ¾ kW through 8 ¾ kW. In lieu of the method provided in Column C, it shall be permissible to add the nameplate ratings of all household cooking appliances rated more than 1 ¾ kW but not more than 8 ¾ and multiply the sum by the demand factors specified in Column A or Column B for the given number of appliances. Where the rating of cooking appliances falls under both Column A and Column B, the demand factors for each column shall be applied to the appliances for that column, and the results added together.

The correct answer is: 10.0 kW.

Answer 240

A

220.53 Appliance Load

1100 VA + 1000 VA + 800 VA + 4700 VA = 7600 VA

7600 VA *75% = 5700 VA

Explanation: According to 220.53, It shall be permissible to apply a demand factor of 75% to the nameplate rating load of four or more appliances fastened in place, other than electric ranges, clothes dryers, space-heating equipment, or air-conditioning equipment, that are served by the same feeder or service in a one-family, two-family, or multifamily dwelling.

Examples of household appliances which are fastened in place and could qualify to be included in the group of appliances that would be subject to the 75% demand factor are: garbage disposals, trash compactors, dish washers, and water heaters.

The correct answer is: 5700 VA.

Answer 241

A

220.82(B)

Dwelling Unit. General Loads.

1800 sq. ft. x 3 VA per sq. ft. 5,400 VA

2 small appliance branch circuits 3,000 VA

1 laundry circuit 1,500 VA

Range 10,000 VA

Clothes dryer 5,000 VA

Water Heater 5,500 VA

Total 30,400 VA

1st 10 KVA at 100% 10,000 VA

Remainder (30,400 VA – 10,000 VA = 20,400 VA) at 40% 8,160 VA

Total general load: 18,160 VA.

Explanation:

The general load consists of:

(1) 3 volt-amperes per sq. ft. for general lighting and general-use receptacles. The floor area does not include open porches, garages, or unused or unfinished spaces not adaptable for future use.
(2) 1500 volt-amperes for each 20 ampere small appliance branch circuit and each laundry branch circuit.
(3) The nameplate rating of
(a) all appliances fastened in place
(b) Ranges, wall mounted ovens, counter-mounted cooking units
(c) Clothes dryers that are not connected to the laundry branch circuit
(d) Water heaters

After these loads are added together, the first 10 KVA is taken at 100%. The remainder of the total load (after subtracting the first 10 KVA) is taken at 40%.

The heating and cooling load in a dwelling must be calculated separately from the general load. See 220.82(C).

In Informative Annex D, Examples D2(a), D2(b), and D2(c) show how to make a single family dwelling calculation.

The correct answer is: 18,160 VA.

Answer 242

A

Dishwasher		1350 VA					
Compactor		2000 VA					
Disposal		1200 VA					
Water Heater	5000 VA					
Attic Fan		780 VA					
Total 		10,330 VA	10,330VA x 75% = 7,748 VA

The correct answer is: 7,748 VA

Answer 243

A

Demand load from Table 220.55 Column C

The correct answer is: 8kW

Answer 244

A

220.5(A)

When calculating branch-circuit and feeder loads, the following nominal voltages should be used: 120, 120/240, 208Y/120, 240, 347, 480Y/277, 480, 600Y/347, 600 volts.

The correct answer is: 120/240

Answer 245

A

Response: Annex D1(a).

3200 sq. ft. x 3 VA per sq. ft. = 9600 VA

9600 VA/120V = 80 amps

80 amps ÷ 15 amp circuit = 5.3 circuits. A minimum of 6 circuits are required.

Explanation: To determine the minimum number of circuits required to serve the lighting load in a dwelling unit, multiply the square footage x 3 VA per square foot and divide by 120 volts. Divide the load in amps by the size of the circuit, 15 amps or 20 amps.

The correct answer is: 6 circuits.

Answer 246

A

From Column A of Table 220.55 the demand factor is 80 %. 2.5 kW x 80% = 2 kW

The correct answer is: 2kW

Answer 247

A

Table 220.55, Column A.

3kW x 80% = 2.4 kW

Explanation: In Table 220.55 it is important to understand when to apply Column A, Column B, and Colum C. The numbers in the columns A and B are demand factors (per cents) that recognize all the heating elements and the oven of an electric range will not be on at the same time. And in a multi-family dwelling when there can be more than one range on a single feeder, all the ranges will not be on at the same time. Column C is not a demand factor, but a kW rating. For example, from Column C, the maximum demand for a 12 kW range is 8 kW.

The correct answer is: 2.4 kW.

Answer 248

A

220.84 Table 220.84

1375 sq. ft. x 3VA = 4125 VA

2 sm. app. circuits = 3000 VA

1 laundry circuit = 1500 VA

A/C = 6500 VA

Cooktop = 3000 VA

Oven = 3500 VA

Water heater = 5000 VA

Dishwasher = 1700 VA

Disposer = 1200 VA

                                                        29,525 VA

29,525 VA x 6 apts. = 177,150 VA

177,150 VA x .44 (Table 220.84) = 77,946 VA

77,946 VA ÷ 240 volts = 324.775 = 325 amps

QuickSearch: Tables / Optional calculations, three or more multifamily units/ Table 220.84

The correct answer is: 77,946 VA, 325 amps.

Answer 249

A

Table 220.55

Demand Factors and Loads for Household Electric Ranges, Counter Mounted Cooking Units, and other Household Cooking Appliances over 1 ¾ kW Rating.

From Column C of Table 220.55, the maximum demand for 13 ranges is 28 kW.

QuickSearch: Ranges / Brach circuits / calculations of load / Table 220.55

The correct answer is: 28 kW.

Answer 250

A

220.84 Table 220.84

 875 sq. ft. x 3                                    =                 2,625 VA

 2 sm. appl. circuits                             =                 3,000 VA

 1 laundry circuit                                 =                 1,500 VA

 heat                                                   =                 8,000 VA

 range                                                 =                10,000 VA

water heater                                        =                 5,000 VA

dishwasher                                          =                 1,200 VA

 disposer                                             =                    900 VA

 compactor                                          =                    850 VA

                                                                           \_\_\_\_\_\_\_\_\_

                                                                             33,075 VA

33075 VA x 3 apartments = 99,225 VA

99225 x .45 = 44,651.25 VA

In a 3-phase circuit Amperage = VA / V x 1.73 (round to 360)

44,651 VA | 360 volts (208 x 1.73) = 124 amps

QuickSearch: Tables / Optional calculations, three or more multifamily units/ Table 220.84

The correct answer is: 44,651 VA, 124 amps.

Answer 251

A

Table 220.55

Demand Factors and Load for Household Electric Ranges, Counter Mounted Cooking Units, and other Household Cooking Appliances over 1 ¾ kW Rating.

Note 1 of Table 220.55 is for ranges of the same rating over 12 kW. Add 5% to the maximum demand in column C for each kW the ranges are over 12 kW.

16kW = 4 kW more than 12 kW.

4 kW x .05 = .20 = 20%.

33 kW x 20% = 6.6 kW.

33 KW + 6.6 = 39.6 kW.

QuickSearch: Ranges / Brach circuits / calculations of load / Table 220.55

The correct answer is: 39.6 kW.

Answer 252

A

220.84 Table 220.84

Use section 220.84 and Table 220.84 to figure the load on the service for a group of apartments. Add all loads together at 100% (only the larger of the heating or A/C) for one apartment, multiply by the number of apartments and multiply that number by the demand factors in Table 220.84.

950 sq. ft. x 3 = 2850 VA

 2 sm. appl. circuits                            =                 3000 VA

 1 laundry circuit                                =                 1500 VA

 heat                                                 =                 9500 VA

 cook top                                           =                 6000 VA

 oven                                                =                 4000 VA

 water heater                                     =                 4500 VA

 dishwasher                                       =                 1500 VA

 disposal                                            =                 1000 VA

                                                             \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

                                                                             33,850 VA

33,850 VA x 6 apartments = 203,100 VA

203,100 VA x .44 = 89,364 VA

(From Table 220.84)

TOTAL:

89,364 VA | 240 volts = 372.35= 372 amps

QuickSearch: Tables / Optional calculations, three or more multifamily units/ Table 220.84

The correct answer is: 89,364 VA, 372 amps.

Answer 253

A

d) electrical installation skills and safety training to avoid hazards

NFPA 70E 2018

Answer 254

A

314.16(B)(1)&(4)&(5).

2 No. 14 conductors = 4 cubic inches

2 No. 12 conductors = 4.5 cubic inches

Switch (double allowance based on No. 14 conductor) = 4 cubic inches

Receptacle (double allowance based on No. 12 conductor) = 4.5 cubic inches

Equipment ground (single allowance based on No. 12 conductor) 2.25 cubic inches

Total: 19.25 cubic inches

QuickSearch: Boxes/Fill Calculations 314.16(B).

The correct answer is: 19.25 cubic inches

Answer 255

A

314.28(A)(1)

requires the length of a straight through pull box to be at least 8 times the raceway size when the conductors are No. 4 Awg or larger. ( 8 x 4” = 32”)

Boxes/Junction, pull/Size/Conductors 4 AWG and larger/314.28(A)

The correct answer is: 32 in.

Answer 256

A

210.8(A)

GFCI protection is not required for outlets installed in a finished basement. 210.8(A). GFCI protection is required for 125-volt, single-phase, 15- and 20-amp receptacles installed in bathrooms, garages and accessory buildings, outdoors, crawl spaces, unfinished basements, kitchens, within 6 ft. of a sink and in boathouses. GFCI protection is also required for outlets rated up to 240 volts installed in boathouses.

(5) Unfinished portions or areas of the basement not intended as habitable rooms.

QuickSearch: Ground-fault circuit interrupters /Required /210.8

The correct answer is: For outlets installed in a finished basement.

Answer 257

A

210.12(B)

All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in dormitory unit bedrooms, living rooms, hallways, closets, bathrooms, and similar rooms shall be protected by any of the means described in 210.12(A)(1) through (6).

QuickSearch: Arc-fault circuit interrupters. 210.12.

The correct answer is: Kitchens

Answer 258

A

210.12(A)

AFCI protection is not required in the garage, outdoors, or in an unfinished basement or crawl space. AFCI protection is required in the family room, dining room, kitchen, living room, parlor, library, den, bedroom, sunroom, recreation room, closets, hallways or similar rooms or areas.

QuickSearch: Arc-fault circuit interrupters / Protection / 210.12(A)

The correct answer is: Garage.

Answer 259

A

210.62

Show window receptacle outlets must be installed within 18 inches of the top of the show window. At least one receptacle outlet shall be installed within 450 mm (18 in.) of the top of a show window for each 3.7 linear m (12 linear ft.) or major fraction thereof of show window area measured horizontally at its maximum width.

QuickSearch: Receptacles / Show windows / 210.62

The correct answer is: A 25 ft. show window with two receptacle outlets spaced evenly and installed 2 ft. from the top of the show window.

Answer 260

A

422.13.

A fixed storage-type water heater that has a capacity of 120 gal. or less shall be considered a continuous load for the purpose of sizing branch circuits. 22.5 amps x 1.25 = 28 amps. Next standard size is 30 amps.

QuickSearch: Water Heaters. 422.13.

The correct answer is: 30 amps.

Answer 261

A

422.10(A).

The branch circuit rating for an appliance that is a continuous load, other than a motor-operated appliance, shall not be less than 125 percent of the marked rating. A 12 Amp load x 1.25 = 15 Amps.

QuickSearch: Branch Circuits/Appliances. Article 422 Part II

The correct answer is: 15 amps.

Answer 262

A

400.12.

Flexible cords are not permitted to be used as a substitute for fixed wiring of a structure.

QuickSearch: Cords/Flexible/Uses not Permitted. 400.8

The correct answer is: As a substitute for fixed wiring of a structure.

Answer 263

A

410.74.

A luminaire requiring supply wire rated higher than 60ºC (140ºF) shall be marked with the minimum supply wire temperature rating on the luminaire and shipping carton or equivalent.

Quicksearch: Luminaire/Rating. 410.74.

The correct answer is: 60ºC.

Answer 264

A

410.16(B).

Luminaire Types Not Permitted. Incandescent luminaires with open or partially enclosed lamps and pendant luminaires or lampholders shall not be permitted.

QuickSearch: Luminaires/Clothes Closets. 410.16(B)

The correct answer is: Pendant luminaires.

Answer 265

A

410.30.

A luminaire weighing more than 6 lbs. shall not be supported by the screw shell of a lampholder.

QuickSearch: Luminaires/Supports. 410-IV.

The correct answer is: The screw-shell of lampholders.

Answer 266

A

250.118(5).

The equipment grounding conductor run with or enclosing the circuit conductors shall be one or more or a combination of the following:

(5) Listed flexible metal conduit meeting all the following conditions:
a. The conduit is terminated in listed fittings.
b. The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
c. The combined length of flexible metal conduit and flexible metallic tubing and liquidtight flexible metal conduit in the same ground-fault current path does not exceed 1.8 m (6 ft).

Quicksearch: Equipment grounding conductors/Types recognized. 250.118.

The correct answer is: The circuit conductors in the raceway must be protected by an overcurrent device not larger than 20 amps.

Answer 267

A

250.30(A)(1) and (2)

An unspliced system bonding jumper shall comply with 250.28(A) through (D). This connection shall be made at any single point on the separately derived system from the source to the first system disconnecting means or overcurrent device, or it shall be made at the source of a separately derived system that has no disconnecting means or overcurrent devices.

The system bonding jumper can be connected at the transformer or at the first disconnect.

Quick Search: Grounding / Separately derived AC systems /250.30(A)(1) and (2)

The correct answer is: Either I or II.

Answer 268

A

250.32(A)

Grounding Electrode. Building(s) or structure(s) supplied by feeder(s) or branch circuit(s) shall have a grounding electrode or grounding electrode system installed in accordance with Part III of Article 250. The grounding electrode conductor(s) shall be connected in accordance with 250.32(B) or (C). Where there is no existing grounding electrode, the grounding electrode(s) required in 250.50 shall be installed.

Quicksearch: Grounding/Separate buildings 250.32

The correct answer is: A grounding electrode or grounding electrode system at the second building.

Answer 269

A

Table 430.250.

The values of full-load currents are typical for motors running at speeds usual for bolted motors and motors with normal torque characteristics.

Quicksearch: Full-load current motors/Three-phase, Table 430.250.

The correct answer is: 77 amperes

Answer 270

A

240.2.

A supervised industrial installation must have a load of at least 2500 kVA used in industrial processes, manufacturing activities, or both.

Quicksearch: Industrial installation, supervised/Definition. 240.2.

The correct answer is: 2500 kVA

Answer 271

A

240.50(A)(2).

Plug fuses are permitted for use in circuits not exceeding 150 volts line-to-neutral if supplied by a system having a grounded neutral point.

Quicksearch: Fuses/Plug, Edison-base type. 240-V.

The correct answer is: Not exceeding 150 volts, line-to-neutral.

Answer 272

A

Table 312.6(B)

Use the far left column on Table 312.6(B). The second column is for compact stranded aluminum alloy conductors. A 1/0 AWG conductor requires 5 ½ inches of wire bending space. Table 312.6(B) is used when the conductor enters or leaves the enclosure on the wall opposite the terminal.

The correct answer is: 5 ½ inches.

Answer 273

A

334.23

The keywords are “Non-Metallic Sheathed Cable”, “Accessible Attics”. The index entry is Non-Metallic Sheathed Cable / Accessible Attics / 334.23. At section 334.23 there is a reference to 320.23.

The correct answer is: Both I and II.

Answer 274

A

314.20

The key word is “box”. The Index entry is Boxes / Concealed work / 314.20.

The correct answer is: Not more than 1/4 inch.

Answer 275

A

210.11. Annex D Example D1(a)

Eight branch circuits is the minimum number of branch circuits required for the dwelling unit. 210.11. Three branch circuits are required for the general lighting load (60 amps / 20 amps = 3 branch circuits). In addition, two 20-ampere small appliance branch circuits are required in the kitchen, one 20-ampere branch circuit is required for the laundry area, one 20-ampere branch circuit is required for the bathroom receptacles, and one 20-ampere branch circuit is required for the garage.

QuickSearch: Dwellings/ Receptacle Circuits Required/ 210.11

The correct answer is: 8

Answer 276

A

210.19(A)(4) Exc. 1.

Tap conductors shall have an ampacity sufficient for the load served. In addition, they shall have an ampacity not less than 15 for circuits rated less than 40 amperes and not less than 20 for circuits rated at 40 or 50 amperes and only when these tap conductors supply any of the following loads: …… (e) Nonheating leads of deicing and snow-melting cables and mats.

NOTE: This exception means the taps must be at least equal to the amps of the load they are feeding, and NO MATTER WHAT SIZE THE LOAD BEING FED, the taps can be rated no less than 15A if the circuit they are tapped from is protected by an OCPD under 40A. Or 20A if the circuit they are tapped from is protected by an OCPD of 40A or 50A.

Quicksearch: Branch Circuits/Taps from. 210.19(A)

The correct answer is: The taps must have an ampacity sufficient for the deicing heating cables, and cannot be less than 20A.

Answer 277

A

110.14(C)(1)

Termination provisions for equipment rated 100 amperes or less or marked for 14 AWG through 1 AWG are rated for use with 60’C conductors unless listed and marked for use with higher temperature rated conductors.

The correct answer is: 60’C

Answer 278

A

110.26(A)(1)

Where the voltage to ground does not exceed 150-volts, the minimum depth of working space is 3 ft.

Working space/about electrical equipment/110.26

The correct answer is: 3 ft.

Answer 279

A

230.43

Service-entrance conductors shall be installed in accordance with the applicable requirements of this code covering the type of wiring method used and shall be limited to methods listed in 230.43.

QuickSearch: Service-entrance conductors / Wiring methods 230.43

The correct answer is: Type AC cable.

Answer 280

A

230.79(C)

For a one-family dwelling, the service disconnecting means shall have a rating of not less than 100 amperes, 3-wire.

QuickSearch: Service Equipment / Rating / 230.79.

The correct answer is: 100 amperes.

Answer 281

A

Table 610.14(E).

For multiple cranes, hoists, or both, supplied by a common conductor system, calculate the motor minimum ampacity for each crane as defined in 610.14(E), add them together, and multiply the sum by the appropriate demand factor from Table 610.14(E).

170 amps + 170 amps = 340 amps x 95% = 323 amps

Quicksearch: Cranes/Conductors 610-II.

The correct answer is: 323 amps.

Answer 282

A

620.51 (C)

The disconnecting means shall be located where it is readily accessible to qualified persons.

Elevators / disconnecting means / 620-VI

The correct answer is: readily accessible to qualified persons

Answer 283

A

600.9(A)

Response: (A) Vehicles. Sign or outline lighting system equipment shall be at least 4.3 m (14 ft.) above areas accessible to vehicles unless protected from physical damage.

QuickSearch: Signs / Location/ 600.9

The correct answer is: 14 ft.

Answer 284

A

680.26(B)(2).

The perimeter surface shall extend for 3 feet horizontally beyond the inside walls of the pool.

Quicksearch: Swimming pools/Bonding. 680/26(B)(2).

The correct answer is: 3 feet.

Answer 285

A

680.42(A)(2)

Cord-and-plug connections with a cord not longer than 15 ft. shall be permitted where protected by a ground-fault circuit interrupter.

Swimming Pools/Spas and Hot Tubs/680-IV.

The correct answer is: be GFCI protected with a cord no longer than 15 ft.

Answer 286

A

690.45

An equipment grounding conductor shall not be smaller than 14 AWG.

Quicksearch: Solar photovoltaic systems/Grounding Part V. 690.45.

The correct answer is: No. 14 AWG

Answer 287

A

630.11(B).

Minimum conductor ampacity shall be based on the individual currents determined in 630.11(A) as the sum of 100% of the two largest welders, plus 85% of the third largest welder, plus 70% of the fourth largest welder, plus 60% of all remaining welders.

Quicksearch: Welders, electric/ Arc. 630-II.

The correct answer is: The sum of 100% of the two largest welders, plus 85% of the third largest welder, plus 70% of the fourth largest welder, plus 60% of all remaining welders.

Answer 288

A

516.5(D)(1)

See Figure 516.5(D)(1).

Quick Search: Hazardous (classified) locations/Spray application, dipping and coating processes. 516.5

The correct answer is: 20 ft.

Answer 289

A

550.10(A)

A listed 50-ampere mobile home power supply cord or a permanently installed feeder.

The power supply to the mobile home shall be a feeder assembly consisting of not more than one listed 60-ampere mobile home power-supply cord or a permanently installed feeder.

Quicksearch: Mobile homes/ Power Supply/ 550.10(A)

The correct answer is: I or II.

Answer 290

A

Table 514.3(B)(1)

Class 1 Division 1. The entire space within any pit or box below grade level, any part of which is within 10 ft. horizontally from any edge of the pump.

Quick search: Motor fuel dispensing facilities / Classification of locations / 514.3

The correct answer is: Class 1 Division 1.

Answer 291

A

320.23(A).

Where this space is not accessible by permanent stairs or ladders, protection shall only be required within 6 ft. of the nearest edge of the scuttle hole or attic entrance.

QuickSearch: Armored Cable/Accessible Attics. 320.23.

The correct answer is: 6 ft.

Answer 292

A

Table 312.6(A).

Table 312.6(A) shall apply where the conductor does not enter or leave the enclosure through the wall opposite its terminal.

From Table 312.6(A) In the 1 wire per terminal column select the row for conductors size 4-3.

The minimum distance required is 2 inches.

QuickSearch: Conductors, Deflection of, See Deflection of Conductors/Cabinets and cutout boxes 312.6.

The correct answer is: 2 inches.

Answer 293

A

358.30( A) Exception No. 1.

Exception No. 1: Fastening of unbroken lengths shall be permitted to be increased to a distance of 1.5 m (5 ft) where structural members do not readily permit fastening within 900 mm (3 ft).

QuickSearch: Electrical Metallic Tubing (Type EMT)/Securing and Supporting. 358.30.

The correct answer is: 5 feet.

Answer 294

A

334.15(C).

Where cable is run at angles with joists in unfinished basements and crawl spaces, it shall be permissible to secure cables no smaller than two 6 AWG or three 8 AWG conductors directly to the lower edges of the joists.

QuickSearch: Nonmetallic-Sheathed Cable/Unfinished Basements 334.15(C).

The correct answer is: Three No. 8 AWG.

Answer 295

A

352.30 Table 352.30(B).

PVC conduit shall be supported as required in Table 352.30. From Table 352.30, in the row for trade size conduit 2 ½-3, read to the right to find the required distance is 6 ft.

QuickSearch: Rigid Polyvinyl Chloride Conduit (PVC)/Securing and Supporting. 352.30.

The correct answer is: 6 ft.

Answer 296

A

338.10(B)(4)(a).

The ampacity of SE cable in sizes larger than No. 10 AWG installed in thermal insulation can be determined by the temperature rating of the conductors in the SE cable. Type THWN conductors are rated 75 degrees C.

QuickSearch: Service-Entrance Cable/Uses Permitted.

The correct answer is: 75°C.

Answer 297

A

334.10(A).

Type NM cable shall be permitted as follows: (1) For both exposed and concealed work in normally dry locations, except as prohibited in 334.10(3).

QuickSearch: Nonmetallic-Sheathed Cable/Uses Permitted. 334.10.

The correct answer is: For exposed and concealed work in normally dry locations (except as prohibited).

Answer 298

A

340.10 ( Table 300.5).

From Table 300.5. Column 3, Nonmetallic Raceways Listed for Direct Burial. Row 5, Under streets, highways, roads, alleys, driveways, and parking lots.

QuickSearch: Underground Feeder and Branch Circuit Cable (Type UF)/Uses Permitted 340.10.

The correct answer is: 24 inches.

Answer 299

A

314.28(A)(2)

requires the distance between the conduit entry and the wall opposite that entry to be no less that 6 times the largest conduit plus the trade size of any other conduits in that row. 6 x 2 in. = 12 in. 12 in. + 1 in. +1 in. = 14 in.

Boxes/Junction, pull/Size/Conductors 4 AWG and larger/314.28(A)

The correct answer is: 14 in. X 14 in.

Answer 300

A

210.8(C)

(C) Boat Hoists. GFCI protection shall be provided for outlets not exceeding 240 volts that supply boat hoists installed in dwelling unit locations.” Receptacles for boat hoists must have GFCI protection whether they are rated 120-volts or 240-volts.

QuickSearch: Boathouses and boat hoists/ 210.8(A)(8) and 210.8(C)

The correct answer is: A 240-volt receptacle supplying a boat hoist at a residential location is required to be GFCI protected.

Answer 301

A

422.11(E)(2).

If the branch circuit supplies a single non-motor-operated appliance, the rating of the overcurrent protection shall comply with the following: (2) Overcurrent protection shall not exceed 20 amperes if the overcurrent protection rating is not marked and the appliance is rated 13.3 amps or less.

QuickSearch: Appliances/Overcurrent Protection. 422.11.

The correct answer is: 20 amps.

Answer 302

A

422.11(C).

Infrared lamp commercial and industrial heating appliances shall have overcurrent protection not exceeding 50 amperes.

QuickSearch: Appliances/Overcurrent Protection. 422.10.

The correct answer is: 50 amps.

Answer 303

A

400.12(5).

Flexible cord is not permitted to be located above a suspended or dropped ceiling.

QuickSearch: Cords/Flexible/Uses not Permitted. 400.8(5).

The correct answer is: Flexible cord located above a suspended or dropped ceiling.

Answer 304

A

410.16(C)(3)

Quicksearch: Luminaires/Clothes Closets. 410.16

The correct answer is: 6 inches.

Answer 305

A

410.36 (B).

Luminaires shall be securely fastened to the ceiling framing member by mechanical means such as bolts, screws, or rivets.

QuickSearch: Luminaires/ Supports. 410-IV.

The correct answer is: Shall be attached to the ceiling framing members by clips listed and identified for use with the fixture and the ceiling framing members.

Answer 306

A

250.102(D), Table 250.122.

Size — Equipment Bonding Jumper on Load Side of an Overcurrent Device. The equipment bonding jumperon the load side of an overcurrent device(s) shall be sized inaccordance with 250.122.A single common continuous equipment bonding jumper shall be permitted to connect two or more raceways or cables if the bonding jumper is sized in accordance with 250.122 for the largest overcurrent device supplying circuits therein.

Quicksearch: Jumpers, bonding/Equipment. 250.102.

The correct answer is: 2/0 copper.

Answer 307

A

Table 250.66

Table 250.66 is used to size the grounding electrode conductor. Table 250.102(C)(1) is used to size the main bonding jumper and the minimum size of the grounded (neutral conductor).

Quick Search: Grounding electrode conductors / sizing / Table 250.66

The correct answer is: No. 4 AWG.

Answer 308

A

Table 250.66

Table 250.66 is used to size the grounding electrode conductor. Table 250.102(C)(1) is used to size the main bonding jumper and the minimum size of the grounded (neutral conductor).

Quick Search: Grounding electrode conductors / sizing / Table 250.66

The correct answer is: 1/0 AWG.

Answer 309

A

Table 430.251(B).

The conversion table is for use only with 430.110, 440.12, 440.41, and 455.8(C).

Quicksearch: Locked-rotor motor current/Conversion, Table 430.251(B). Table 430.251(B).

The correct answer is: 145 amperes

Answer 310

A

240.6

Standard ratings include 35, 45 and 110 amperes. 900 amperes is not a standard rating.

Circuit breakers/ratings/240.6

The correct answer is: 900 amperes

Answer 311

A

240.4(C) and 240.6.

Where the overcurrent device is rated over 800 amperes, the ampacity of the conductors must be equal to or greater than the rating of the overcurrent device.

Conductors/overcurrent protection/240.4

The correct answer is: 1000 amperes

Answer 312

A

Key terms Mobile home and service equipment

Mobile homes/Service equipment/550.32

The correct answer is: 30 ft.

Answer 313

A

Table 515.3.

The area between 3 ft. and 5 ft. of open end of vent, extending in all directions for a vent that discharges upwards is Class 1 Division 2.

The correct answer is: Class 1 Division 2

Answer 314

A

210.23(A)(2).

The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plug-connected utilization equipment not fastened in place, or both, are also supplied.

15 Amps x .50 = 7.5 Amps.

Quicksearch: Branch Circuits/Permissible loads. 210.23.

The correct answer is: 7.5 amps.

Answer 315

A

210.19(A)(2).

Conductors of branch circuits supplying more than one receptacle for cord-and-plug-connected portable loads shall have an ampacity of not less than the rating of the branch circuit.

Quicksearch: Branch Circuits/Ratings 210-II.

The correct answer is: When the branch circuit conductors supply two or more receptacles serving portable loads.

Answer 316

A

Table 110.26(A)(1).

The depth of the working space in the direction of live parts shall not be less than that specified in Table 110.26(A)(1).

Quicksearch: Working space/About electrical equipment 110.26.

The correct answer is: Four feet.

Answer 317

A

230.95

Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150 volts ground but not exceeding 600 volts phase-to-phase for each service disconnect rated 1000 amperes or more.

QuickSearch: Services / Ground-fault protection / 230.95

The correct answer is: When the service disconnect is rated 1000 amperes or more.

Answer 318

A

230.24(B)(3)

15 feet - for those areas listed in the 12-ft. classification where the voltage exceeds 300 volts to ground.

QuickSearch: Clearances/Conductors/Overhead service. 230.24

The correct answer is: 15 feet.

Answer 319

A

610.14(E)(2)

Response: (2) Multiple Motors on Single Crane or Hoist. For multiple motors on a single crane or hoist, the minimum ampacity of the power supply conductors shall be the nameplate full-load ampere rating of the largest motor or group of motors for any single crane motion, plus 50 percent of the nameplate full-load ampere rating of the next largest motor or group of motors, using that column of Table 610.14(A) that applies to the longest time-rated motor.

50 amps + (25 amps x .5) = 62.5 amps

QuickSearch: Cranes / Article 610

The correct answer is: 62.5 amps.

Answer 320

A

620.14.

Feeder conductors of less ampacity than required by 620.13 shall be permitted, subject to the requirements of Table 620.14.

From the Table, the demand factor for 5 elevators is 82%

Quicksearch: Elevators/Conductors. Article 620-II through 620-IV.

The correct answer is: 82%

Answer 321

A

600.21(D)

A working space at least 900 mm (3 ft) high X 900 mm (3 ft) wide X 900 mm (3 ft) deep shall be provided at each ballast, transformer, electronic power supply, and Class 2 power source or at its enclosure where not installed in a sign.

Quicksearch: Signs/Electric/Location. 600.21.

The correct answer is: A 3 ft. high X 3 ft. wide X 3 ft. deep working space in front of the power supply.

Answer 322

A

680.23(A)(4)

No underwater luminaire shall be installed for operation on supply circuits over 150 volts between conductors.

Swimming Pools / Underwater Luminaires / 680.23

The correct answer is: 150 volts

Answer 323

A

680.22(A)(1)

At least one 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit shall be located between 6 and 20 ft. of the inside wall of the pool.

Swimming Pools / Receptacles / location / 680.22(A)

The correct answer is: between 6 ft. and 20 ft.

Answer 324

A

690.45.

Equipment grounding conductors for PV source and PV output circuits shall be sized in accordance with 250.122.

Equipment grounding conductor/solar photovoltaic systems/690.43 through 690.46.

The correct answer is: 10 AWG copper

Answer 325

A

630.32(A).

Each welder shall have an overcurrent device rated or set at not more than 300 percent of the rated primary current of the welder.

Quicksearch: Welders, electric/ Resistance. 630-III.

The correct answer is: 300% of the rated primary current of the welder.

Answer 326

A

513.3(C)

The area within 5 feet horizontally from aircraft power plants or aircraft fuel tanks shall be classified as a Class I, Division 2 location that shall extend upward from the floor to a level of 5 feet above the upper surface of wings and of engine enclosures. The disconnect is located outside of the hazardous area.

Quick Search: Aircraft Hangars /Classification of Locations / 513.3(C)

The correct answer is: Not classified.

Answer 327

A

16,000 VA x 26 = 416,000/240 = 1,733 x .24 = 416 amps.

Quick search: Mobile home parks / feeder and service demand factors / Table 550.31

The correct answer is: 416 amps.

Answer 328

A

514.11(A)

Fuel dispensing systems shall be provided with one or more clearly identified emergency shutoff devices or electrical disconnects. Emergency shutoff devices or electrical disconnects shall disconnect power to all dispensing devices; to all remote pumps serving the dispensing devices; to all associated power, control, and signal circuits; and to all other electrical equipment in the hazardous (classified) locations surrounding the fuel dispensing devices. The emergency disconnecting means must be located at least 20 ft. but no more than 100 ft. from the fuel dispensers.

Quick Search: Motor fuel dispensing facilities / Circuit disconnecting means /514.11

The correct answer is: The emergency disconnect must disconnect power to all dispensing devices, and all associated pumps, power, control, and signaling circuits.

Answer 329

A

320.80.

The ampacity of cable installed in these applications shall not exceed that of a 60°C (140°F) rated conductor.

QuickSearch: Armored Cable/ampacity. 320.80.

The correct answer is: 60 degrees C.

Answer 330

A

Table 312.6(B).

Table 312.6(B) shall apply where the conductor does enter or leave the enclosure through the wall opposite its terminal.

From Table 312.6(B) find the 1 wire per terminal column for a 3/0 AWG conductor. The small a next to 6 ½ inches refers to Note 2. For lay-in terminals reduce the wire bending space by ½ inch.

QuickSearch: Conductors, Deflection of, See Deflection of Conductors/Cabinets and cutout boxes 312.6.

The correct answer is: 6 inches.

Answer 331

A

Table 352.44.

From Table 352.44. Temperature change is 75 degrees. Find Temperature Change = 75 degrees. Expansion is 3.04 inches.

QuickSearch: Rigid Polyvinyl Chloride Conduit (PVC)/Supporting and securing Table 352.30.

The correct answer is: Slightly more than 3 inches.

Answer 332

A

338.10(B)(4)(a).

The ampacity of SE cable in sizes larger than No. 10 AWG installed in thermal insulation can be determined by the temperature rating of the conductors in the SE cable. Type THWN conductors are rated 75 degrees C.

QuickSearch: Service-Entrance Cable/Uses Permitted.

The correct answer is: 75°C.

Answer 333

A

334.80.

The ampacity of Types NM, NMC, and NMS cable shall be determined in accordance with 310.15. The allowable ampacity shall not exceed that of a 60°C (140°F) rated conductor.

QuickSearch: Nonmetallic-Sheathed Cable/Ampacity.

The correct answer is: 60°C.

Answer 334

A

340.10 1-7. 340.12(1)

Type UF cable shall not be used as service-entrance cable.

QuickSearch: Underground Feeder and Branch Circuit Cable (Type UF)/Uses Permitted 340.10/Uses Not Permitted 340.12.

The correct answer is: As service-entrance cable.

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