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NEC 2008 > April 90 questions > Flashcards

April 90 questions Flashcards

NEC 2008 questions

1
Q

The feeder conductor ampacity shall not be less than that of the service-entrance conductors where the feeder conductors carry the total load supplied by service conductors with an ampacity of _____ or less.

A

55 Amps

215.2(A)

215 Feeders

(A) Ampacity relative to service conductors

THe feeder conductor ampacity shall not be less than that of the service conductors where the feeder conductors carry the total load supplied by service conductors with an ampacity of 55 amperes or less.

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2
Q

The vertical clearance from ground level over a residential driveway for overhead service conductors not subject to truck traffic and are less than 300 volts to ground shall be ____ ft.

A

12 ft.

230 Services

  1. 24(B)(2)
  2. 24 Clearances

(B)Vertical Clearnce for Service-Drop Conductors

(2)12 ft.- over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground

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3
Q

In health care facility, receptacles and attachment plugs in a hazardous (classified) location within anesthetizing area shall be listed for use in Class I, Group ____.

A
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4
Q

Fixed in place X-Ray Equipment properly supplied by a branch circuit rated at not over ____ amperes shall be permitted to be supplied through a suitable attachment plug cap and hard service cable or cord

A

30 amperes

660 X-Ray Equipment

  1. 4(A)
  2. 4 Connection to Supply Circuit

(A) Fixed and Stationary Equipment Fixed and stationary X-Ray equipment shall be connected to the power supply by means of a wiring method meeting the general requirements of this Code, Equipment properly supplied by a branch circuit not rated over 30 amperes shall be permitted to be supplied through a suitable attachment plug cap and hard-service cable or cord.

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5
Q

For switchbords that are not totally enclosed, a space of ___ or more shall be provided between toe top of the switch board and any combustile ceiling.

A

36 inches (3 feet)

408

Switchboards and Panelbords

  1. 18(A)
  2. 18 Clearances

(A) From Ceiling

For other than a totally enclosed switchboard, a space not less than 3 feet shall be provided between the top of the switchboard and any combustible ceiling, unless a noncombustible shield is provided between the switchboard and the ceiling.

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6
Q

Indoor electrical vehicle charging sites, unless specifically listed for the purpose and location, the coupling means of the electric vehicle supply equipment shall be stored or located at a height of not less than ____ and not more than 4 ft.

A

18 inches

625 Electric Vehicle Charging system

  1. 29(B)
  2. 29 Indoor sites.

(B) Height

Unless specifically listed for the purpose and location, the coupling means of the electric vehicle supply equipment shall be stored or located at a height of not less than 18 inches and not more then 4 feet above the floor level

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7
Q

In patient care areas, the grounding terminals of all receptacles and all noncurrent-carrying conductive surfaces of fixed electric equipment _____, _____, _____ shall be connected to an insulated copper equipment grounding conductor.

A

likely to become energize

operating at 100 volts

subject to personal contact

517.13(B)

517 Health Care facitlities

517.13 Grounding of receptacles and fixed electrical equipment in patient care areas

(B)Insulated Equipment Grouding conductor

The grounding terminals of all receptadcles and all non-current-carrying conductive surfaces of fixed electrical equipment likely to become energized that are subject to personal contact, operating at over 100 volts, shall be connected to an insulated copper equipment grounding conductor.

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8
Q

For cord and plug connected electric vehicle supply equipment is used, the interrupting device of a listed personnel protection system shall be provided and shall be located in the power supply cable not more than ____ from the attachment plug.

A

12 inches

625 Electric Vehicle Charging System

625.22 Personnel Protection System

…. Where cord-and-plug connected electric vehicle supply equipment is used, the interrupting device of a listed personnel protection system shall be provided and shall be an integeral part of the attachment plug or shall be located in the power supply cable not more than 12 in. from the attachment plug.

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9
Q

Grounding requirements for a central vaccum shall have accesible?

A

Accesible non-current carrying metal parts of the central vaccum outlet assembly shall be connected to an equipment grounding conductor

422 Appliances

  1. 15(C)
  2. 15 Central Vaccum Outlet Assemblies
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10
Q

The maximum total voltage drop on branch-circuit conductors is _____ percent.

A

3 percent

210

Branch Circuits

  1. 19(A)(1)
  2. 19 Conductors - Minimum Ampacity and Size.

(A)

Branch Circuits Not More Than 600 Volts

(1) General

Conductors of branch circuits shall be sized to allow for a maximum voltage drop of 3 percent at the last outlet supplying light, heat or power and the maximum voltage drop allowable for feeders and branch circuit combined shall not exceed 5 percent.

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11
Q

Where it is impracticable to locate the service head above the point of attachment, the service head location shall be permitted not farther than _____ from the point of attachment.

A

24 inches

230 Service Nyc Amendment

  1. 54(B) Exception
  2. 54 Overhead Service Locations.

(B) Service Heads Above Service-Drop Attachement

Exception

Where it is impracticable to locate the service head above the point of attachemnt, the service head location s_hall be permitted not farther than 24 inches from the point of attachment._

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12
Q

Lighting systems covered by Article 411 shall have a power supply rated not more than ___ and not more than 30 Volts.

A

25 Amps

411 Appliances

411.2 Definitions

Lighting Systems Operating at 30 Volts or Less.

A lighting system consisting of an isolating power supply, the low-voltage luminaires, and associated equipment that are identified for use. The output circuits of the power supply are rated for not more than 25 amperes and operate 30 volts (42.4 volts peak) or less under all load conditions.

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13
Q

How many receptacle outlets are permitted on a 20 A, 120 V circuit in a commercial building?

A

120*20

______

180

= 13.333

13 receptacles

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14
Q

In New York City for services not rated over 600 Volts, you can use Type ____ cable as long as the cabl is enclosed in a threaded metallic conduit.

A

Type SE Cable

338 NYC Amendment

Service-Entrance Cable; Type SE and USE

  1. 10(A)
  2. 10 Uses Permitted

(A) Service Entrance Condutors

Where installed as service entrance conductors, Type SE cable shall be enclosed in a threaded metallic conduit.

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15
Q

How many receptacles are required within the perimeter of a balcony, deck, or porch with a usable area of less than 20 Sq. feet.

A

One(1)

210

Branch circuits

  1. 52(E)(3)
  2. 52 Dwelling Unit Receptacle Outlets

(E)Outdoor Outlets

(3) Balconies, Decks, and Porches.

Baclonies, Decks, and porches shall have at least one receptacle outlet installed within the perimeter of the balcony, deck, or porch. The receptacle shall not be located more than 6 1/2 feet above the balcony, deck, or porch surface.

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16
Q

Service conductors installed as unjacketed multiconductor cable shall have a minimum clearance of ____ from windows that are designed to be opened, doors, porches, stairs, fire escapes, or similar locations.

A

3 Feet

230 Services

  1. 9(A)
  2. 9 Clearances on Buildings

(A) Clearances

Service conductors installed as open conductors or multiconductor cable without an overall jacket shall have a clearance of not less than 3 Feet from windows that are designed to be opened, doors, porches, stairs, fire escapes, or similar locations.

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17
Q

What electrical equipment room requires 2 means of egress?

A

Network Compartments

110

Requirements for Electrical Installations

  1. 26(H) NYC Amendment
  2. 26

Space About Electrical Equipment

(H) Network Compartments

All Network Compartments shall have at least 2 means of access. Each door shall access an area that leads to legal exit.

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18
Q

Fuses and circuit breaker shall be permitted to be connected in parrallel where they are _______ in paralllel and listed as a unit.

A

Factory Assembled

240 Overcurrent Protections

240.8 Fuses or Circuit Breakers in Parallel.

Fuses and circuit breakers shall be permitted to be connected in parallel where they are factory assembled in parlallel and listed as a unit. Individual fuses, circuit breakers, or combinations thereof shall not otherwise be connected in parallel.

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19
Q

Nonmetallic cables must be fastened ___ inches to enter the top of surface-mounted cabinets,cutout boxes, and meter socket enclosures through nonflexible raceways, the race ways shall not penetrate a structural ceiling and the minimum lenght of the raceway shall be ___ and maximum length shall be?

A

12 inches(fastened in place)

18 inches(min. raceway)

10 ft(max. raceway)

312 Cabinets, cutout boxes, and meter socket enclosures.

  1. 5(C) exception
  2. 5 Cabinets, cutout boxes, and meter socket enclosures.

(C)Cables

Exception:

Cables with entirely nonmetallic sheaths shall be permitted to enter the top of a surface-mounted enclosure through one or more nonflexible raceways not less than 18 inches, and not more than 10 feet. in length, provided all of the following coniditions are met

(a)Each cable is fastened within 12 inches measured along the sheath, of the the outer end of the raceway.

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20
Q

At least ____125 V, single phase, 15 A or 20 A, duplex with a ground fault circuit interrupter receptacle shall be provided in each elevator amchine room and elevator machinery space.

A

One

620 Elevators

  1. 23(C)
  2. 23 Branch circuits for machine room or control room/machinery space or control space lighting and receptacle(s)

(C) Duplex receptacle

At least one 125 volt, single phase, 15 or 20 ampere duplex receptacle shall be provided in each machine room or control room and machinery space or control space.

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21
Q

As per New York City NEC in addition to the number of branch circuits required in a dwelling unit an individual branch circuit shall be provided for each ____ receptacle.

A

Air Conditioner

210 Branch Circuits

  1. 11(C)(4)
  2. 11 Branch Circuits Required

(C) Dwelling Units

2011 NYC ammendment

(4) Air Conditioning Branch CIrcuit.

In addition to the number of branch circuits required by other parts of this section, an _individual branch circui_t shall be provided _for each air-conditioning receptacle_ requiered by 210.52(I)

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22
Q

Conductors are considered outside a building whe they are buried under not less than

A

2 Inches

230 Services

  1. 6(1)
  2. 6 Conductors Considered outside the building
    (1) Where installed under not less than 2 inches of concrete beneath a building or other structure
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23
Q

Supply service drops of 0-750 volts running above and parallel to communications service drops shall have a seperation of?

A

12 inches

800 Communication circuits

  1. 44(A)(4)
  2. 44 Overhead communications wires and cables

(A)On poles and In-Span

(4)Clearance

Supply service drops of 0-750 volts running above parallel to communications service drops shall have a minimum seperation of 12 inches at any point in the span…..

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24
Q

Open conductors installed outside shall be seperated from open conductors of other circuits or systems by not less than ____.

A

225 Outside Branch Circutis and Feeders

  1. 14(C)
  2. 14 Open- Conductor Spacings

(C) Seperation from Other Circuits.

Open conductors shall be seperated from open conductors of other circuits or systems by not less than 4 inches.

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25
Q

Which flexible cable is allowed to be used for a Electric Vehicle Charging Station 300 Volts?

A

EVJ

Table 400.4

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26
Q
A
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27
Q

In health care facilities, patient bed receptacles located in general care areas shall be supplied by at least ___ branch circuits which are permitted to originate from two sepearate transfer switches on the emergency system.

A

2 (TWO)

517

Health Care Facilities

  1. 18 (A) Exception 3
  2. 18 General Care Areas

(A) Patient Bed Locations

Exception 3

A general care paitent bed location served from two seperate transfer switches on the emergency system shall not be required to have circuits form the normal system.

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28
Q

Type ____ Fuse adapters shall be designed so that once inserted in a fuseholder they cannot be removed.

A

Type S

240 Overcurrent Protection

  1. 54(C)
  2. 54 Type S Fuses, Adapters, and Fuseholders.

(C) Nonremovable. Type S adapters shall be designed so that once inserted in a fuseholder, they cannot be removed.

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29
Q

Where angle or U pulls are made, the distance between each raceway entery inside the box and the largest opposite wall of the box shall not be less than _____times the trade size of the largest in a row.

A

6 Times

314

Outlet, Device, Pull and Junction Boxes, Conduit Bodies, Fittings, and Handholes

  1. 28(A)(2)
  2. 28

Pull and Junction Boxes and Conduit Bodies.

(A) Minimum Size

(2)

Angle of U Pulls, or Splices.

Where splices or where angle or U pulls are made, the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than six times the trade size of the largest raceway in a row.

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30
Q

New York City Department of Buildings approved manufacturer wiring methods shall be used only for ______

A

General lighting circuits above an accesible hung ceiling or wehre no finished ceiling exists.

ARTICLE 604 NYC Amendment
Manufactured Wiring Systems

SECTION 604.1

Subsection 604.1(A) – Add a new subsection 604.1(A) to read as follows:

(A) General. All such wiring systems shall be approved by the department, and shall comply with the installation requirements of this code in addition to the standards listed below. Each manufactured wiring system manufacturer shall add the following to its installation instructions:

(1) With the electrical permit application for each installation, or any subsequent modification thereof, the licensed electrician shall include a diagram or specification sheet clearly defining the boundaries where the wiring method will be installed.
(2) Manufactured wiring systems shall not be used for emergency exit signs or emergency lighting.
(3) Such wiring shall be used only for general lighting circuits above an accessible hung ceiling or where no finished ceiling exists.

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31
Q

For a portable motor rated at _____ hp or less, the controller shall be permitted to be an attachment plug and receptacle.

A

(Portable Motor) 1/3 horsepower or less

430

Motors, Motor circuits, and controllers

  1. 81(B)
  2. 81 Portable Motor of 1/3 Horsepower or less

For a portable motor rated at 1/3 horsepower or less, the controller shall be permitted to be an attachment plug and receptacle.

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32
Q

A 125 volt, single phase, 15 or 20 ampere rated outlet shall be installed at an accessible location for the servicing of heatin, air conditioning, and refrigeration equipment. The receptacle shall be located on the same level and within ____ of the heating, air conditioning, and refrigeration equipment. The receptacle outlet shall not be connected to the load side of the equipment disconnecting means.

A

25 Feet

210 Branch Circuits

210.63 Heating, Air-Conditioning, and Refrigeration Equipment Outlet.

A 125 Volt, single phase, 15 or 20 ampere rated receptacle outlet shall be installed at an accessible location for the servicing of heating, air-conditioning, and refrigeration equipment. The receptacle shall be located on the same level and within 25 feet of the heating, air conditioning,and refrigeration equipment. The receptacle shall not be connected to the load side of the equipment disconnecting means.

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33
Q

A seperate ____ shall supply the elevator hoistway pit lighting and receptacle. The required lighting and or sump pump shall not be connected to the load side of a ground-fault circuit interrupter.

A

Branch Circuit

620.24(A)

620 Elevators, dumbwaiters, escalators, moving walks, platform & stairway chairlifts

620.24 Branch circuit hoistway pit lighting and receptacles

(A) Seperate branch circuit. A seperate branch circuit shall supply the hoistway pit lighting and receptacles. Required lighting shall not be connected to the load side of a ground fault circuit interrupter.

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34
Q

Indoor antenna lead-ins shall not be run nearer than ____ to conductors of other wiring systems in the premises.

A

2 inches

810

Radio and Television Equipment

  1. 18(B)
  2. 18 Clearances _ Recieving Stations

(B) Antennas and Lead-ins - Indoors

Indoor antennas and indoor lead-ins shall not be run nearer than 2 inches to conductors of other wiring systems.

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35
Q

What is the maximum voltage drop from Service point to last overcurrent device in a dwelling unit?

A

4 percent

215

Feeders

  1. 2(A)(1) exception 3 NYC Amendment
  2. 2 Minimum Rating and Size.

(A) Feeders Not More than 600 Volts

(1) General

Exception 3

For residential occupancies and portions of the electircal system of mixed use building serving exclusively residential occupancies, the maximum voltage drop from service point to the last overcurrent device shall not exceed 4 percent and the total maximum voltage drop to the last outlet shall not exceed 5 percent.

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36
Q

Class 2 and Class 3 circuits shall not be placed in any enclosure, raceway, cable, or similar fittings with conductors of Class 1 or electric light or power conductors, unless ____.

A

unless seperated by a barrier

725

Class 1, Class 2, Class 3 Remote Control, Signaling, and Power-Limited Circuits

  1. 136(B)
  2. 136 Seperation from Electic Light, Power, Class 1, and Medium-Power Network-Powered Broadband Communications Cables.

(B) Seperated by Barriers.

Class 2, Class 3 circuits shall be permitted to be installed together with the conductors of electric light, power, Class 1, and medium power network-powered broadband communications circuits where they are seperated by a barrier

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37
Q

Alternating-current general-use snap switches are permitted to control _____.

A
  1. Resisitive and inductive loads that do not exceed the ampere and voltage rating of th switch.
  2. Tungsten-filament lamp loads that do not exceed the ampere rating of the switch at 120 volts
  3. Motor loads that do not exceed 80 percent of the ampere and voltage rating of the switch.

404 Switches

  1. 14(A)
  2. 14 Rating and Use of snap switches

(A) Alternating Current General-Use Snap Switch

(*see above for article details)

38
Q

Dwelling units circuits running through another dwelling unit in common areas. What percentage of change, will require it to be brought up to current code.

A

50%

210

Branch Circuits

210.25 NYC Amendment exception (A)(1)

Branch Circuits in Buildings with More than One Occupancy

(A) Dwelling unit Branch Circuits

Exception (1)

Undergoing renovation less than 50 percent

39
Q

A seperation of at least ____ shall be maintained between communications wires and cables on building and lightning conductors, where practicable.

A

6 Feet (From Lightning conductors)

830

Network powered broadband communications systems

  1. 44(I)(3)
  2. 44 Aerial Cables

(I) On Buildings

(3)Lightning Conductors

Where practicable, a seperation of at least 6 feet shall be maintained between any network-powered broadband communication cable and lightning conductors.

40
Q

Infared lamps for commercial and industrial heaing appliances shall have overcurrent protection not exceeding.

A

50 Amps

422.11(C)

422 Appliances

422.11 Overcurrent Protection

(C)Infared Lamp Commercial and Industrial Heating Appliances.

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

41
Q

A Limited Care Facility is an area used on a _____basis for the housing of four or more persons who are incapable of self-preservation because of age, physical limitation due to accident or illness, or mental limitations, mental illness, or chemical dependency.

A

24 hour basis

517

Health Care Facilities

517.2
Definitions

Limited Care Facility

A buiding or portion thereof used on a 24-hour basis for housing of four or more persons who are incapable of self-preservation because of age, physical limitation due to accident or illness; or limitations such as mental retardation/development disability, metal illness, or chemical dependency.

42
Q

Cables with entirely nonmetallic (Romex) shall be permitted to enter the top of a surface-mounted enclosure through on or more nonflexible raceways not less than?

A

18 Inches

312 Cabinets, Cutout boxes, and Meter socket enclosures.

  1. 5(C) exception
  2. 5 Cabinets, cutout boxes, and meter socket enclosures.

(C)Cables

exception

Cables with entirely nonmetallic sheaths shall be permitted to enter the top of a surface-mounted enclosure through one or more nonflexible raceways not less than 18 inches and not more than 10 feet in length……

43
Q

Type 3 surge protective devices can be installed on the load side of a branch-circuit overcurrent device up to the equipment served. IF ______, the Type 3 SPD connections must be a minimum 30 ft. of conductor distance from the service or speratley derived system disconnect.

A

Included in the manufacturers instruction

285 Surge Protective Devices (SPD,s)1kv or Less

285.25 Type 3 SPD’s

Shall be installed anywhere on the load side of the branch circuit overcurrent protection up to the equipment served, provided the connection is a minimum of 30 ft. of conductor distance from the service or seperatley derived system disconnect.

44
Q

A fixed storage type water heater of 120 gallons or less shall be considered a ______ load and the branch circuit conductors shall have an ampacity of ___% of the nameplate current rating?

A

Continuous/125%

422.13

422 Appliances

422.13 Storage-Type Water Heaters

A fixed storage type water heater has a capacity of 120 gallons or less shall be considered a continuous load for the purposes of sizing branch circuits.

45
Q

Outdoor electrical vehicle charging sites, unless specifically listed for the purpose and location, the coupling means of the electric vehicle supply equipment shall be stored or located at a height of not less than ____ and not more than 4 feet.

A

24 inches

625

Electric Vehicle Charging System

  1. 30(B)
  2. 30 Outdoor Sights.

(B) Height.

Unsless specifically listed for the purpose and location, the coupling means of electric vehicle supply equipment shall be stored or located at a height

46
Q

Type ____ is a multi conductor cable identified for use as underground service-entrance cable

A

USE (Underground Service Entrance)

338 Service entrance cable types SE and USE

338.2 Definitons

Type USE Service-entrance cable, identified for underground use, having a moisture-resistant covering, but not required to have a flame-retardent covering.

47
Q

What is the minimum Service Conductor allowed for a dwelling unit

A

4 copper or #2 aluminium/copper-clad aluminium

230 Services

  1. 31(B)-Nyc amendement
  2. 31 Size and Rating

(B) Minimum Size

That conductors shall not be smaller than 4 AWG copper or 2 AWG Aluminum or Copper-CLad Aluminum

48
Q

Panelboard supplied by a three-phase, 4 wire, delta-connected system shall have the phase with higher voltage to ground (high-leg) connected to the _____ phase.

A

B phase

408 Switchboards and Panelbords

  1. 3(E)
  2. 3 Support and Arrangement of Busbars and Conductors.

(E) Phase Arrangement

The phase arrangement on 3-phase buses shall be A,B,C from front to back, top to bottom, or left to right, as viewed form the front of the switchboard or panelboard. The B phase shall be that phase having the higher voltage to ground on 3-phase, 4-wire, delta-connected systems….

49
Q

Where skin affect exist the ferromagnetic (having high susceptibility to magnetism) envelope shall be bonded at

A

At All Joints

427

Fixed Electric Heating Equipment for Pipelines and Vessels

427.48 Grounding

The ferromagnetic envelope shall be grounded at both ends, and, in addition it shall be permitted to be grounded at intermediate points as required by its design. The ferromagnetic envelope shall be bonded at all joints to ensure electrical continuity

50
Q

What is the maximum number of THHW(.0133) wires you can fit in one inch PVC(.087)?

A

6

51
Q

At least one receptacle outlet shall be installed within __ of the top of a a show window for each 12 linear feet measured horizontally across its length.

A

18 inches

210

Branch Circuits

210.62 Show Windows.

At least one receptacle outlet shall be installed within 18 inches of the top of a show window for each 12 linear feet or major fraction thereof of show window area measured horizontally at its maximum width.

52
Q

Which flexible cable is allowed to be used for Electric Vehicle Charging Station 600 Volts with thermoplastic?

A

EVE

Table 400.4

53
Q

A hospital is a building or a portion therof used for medical, psychiatirc, obsterical, or surgical care, on a 24- hour basis, of ___ or more patients.

A

4 or more

517

Health Care Facilities

517.2 Definitions

Hospital - A building or portion thereof used on a 24-hour basis for the medical, psychiatric, obsteterical, or surgical care of four or more inpatients.

54
Q

Communications circuits shall have a minimum grounding conductor of __ AWG.

A

12 AWG

800 Communictaions Circuits

  1. 100(A)(3)
  2. 100 Grounding Methods.

(A) Grounding conductor

(3) Size

The grounding conductor shall not be smaller than 12 AWG

55
Q

A serperation of at least ____ is required between network communication cable and power cables.

A

4 Inches

830 Network Powered Broadband Communictions Systems

  1. 44(I)(1)
  2. 44 Aerial Cables

(I) On Buildings

(1) Electric Light or Power.

The network-powered broadband communications cable shall have a seperation of at least 4 inches from electric light, power, Class 1, or non-power limited fire alarm circuit conductors not in raceway or cable, or be permanently seperated from conductors of the other system by a continious and firmly fixed non-conductor or in addition to the insulation on the wires.

56
Q

Panelboards equipped with snap switches rated at 30 A or less shall have overcurrent protection not exceeding ____.

A

200 Amperes

408

Switchboards and Panelboards

  1. 36(A)
  2. 36 Overcurrent Protection

(A) Snap Switches Rated at 30 Amperes or Less

Panelboards equipped with snap switches rated at 30 amperes or less shall have overcurrent protection of 200 amperes or less.

57
Q

The equipotential plane in agricultural building shall be connected to the electrical grounding system with a copper, insulated, covered, or bare conductor and not smaller than _____

A

8 AWG

547

Agricultural Buildings

  1. 10(B)
  2. 10 Equipotential Planes and Bonding of Equipotential Planes.

(B) Bonding

Equipotential planes shall be connected to the electrical grounding system. The bonding conductor shall be copper, insulated, covered by bare, and not smaller than 8 AWG

58
Q

For show-window lighting, a load of not less than 660 volt ampere/linear meter or ____ volt ampere/linear foot shall be included for show window measured horizontally along its base.

A

200 Volt amps per linear foot

220 Branch Circuit, Feeder, and Service Calculations

  1. 43(A)
  2. 43 Show- Window and Track Lighting.

(A) Show windows.

For show-window lighting, a load of not less than 660 volt-amperes/linear meter or 200 volt-amperes/linear foot shall be included for a show for a show window, measured horizontally along its base

59
Q

What type of circuits shall not be connected to life saftey branch in a hospital?

A

Genearl Illumination

517 Health Care Facilities

517.32 (A-H)

Life Saftey Branch

(all the following are allowed on life saftey branch ckt)

(A) Illumination of Means of egress

(B) Exit Signs

(C) Alarm and Alerting Systems

(D) Communication Systems

(E) Generator Set and Transfer Switch Locations

(F) Generator Set Accesories

(G) Elevators

(H) Automatic Doors

60
Q

Where conductors or cables are installed in conduits exposed to direct sunlight on or above rooftops, the ambient temperature shall be increased by ______ where the conduits are less than 1/2 inch from the rooftop.

A

60 F

310 Conductors for general wiring

Table 310.15(B)(2)(c)

Ambient Temperature Adjustments for Conduits Exposed to Sunlight On or Above Rooftops

  • 1/2 inch - 60F
  • 1/2 - 3 1/2 inch - 40F
  • 3 1/2 - 12 inch - 30F
  • 12 - 36 inch - 25F
61
Q

In a dwelling unit which appliance is allowed to have a 24” cord with attachment ground plug?

A

Combination Range hood/ Microwave oven

422 Appliances

  1. 16(B)(4)(2)
  2. 16 Flexible Cords.

(B) Specific Appliances

(4)Range Hoods

Range Hoods shall be permitted to be cord-and- plug connected with a flexible cord identified as sutable for use on range hoods in the installation instructions of the appliance manufacturer, where all conditions are met (2) The length of the cord is not less than 18 inches and not over 36 inches

62
Q

Outlets may be installed in a dwelling unit for specific appliance such as laundry equipment. What is the maximum distance allowed between this outlet and the appliance?

A

6 Feet

210 Branch Circuits

  1. 50(C)
  2. 50 General

(C) Appliance Recetpacle Outlets.

Appliance recetpacle outlets installed in a dwelling unit for specific appliances, such as laundry equipment, shall be i_nstalled within 6 feet_ of the intended location of the appliance.

63
Q

A multifamily building has 12 units. The system voltage is 120/240 volts, single-phase. Each 1,500 sq ft unit contains the following

Dishwasher 1.5 kVA

Water Heater 4 kW

Dryer 4.5 kW

Washing Machine 1.2 kVA

Range 14.45 kW

A/C (230V) 3 Hp

A/C fan motor 1/8 hp (334V)

Heat 5 kW

What is the building feeder/service calculated load for the 4.5kW dryers

A

27.60 kW

Table 220.54

12-23 = 47% - 1% for each dryer exceding 11

47%-1% = 46%

5 * 12 * .46=

27.60 kW

( the minimum load is 5kW for standard calculations)

64
Q
A
65
Q

Individual branch circuits shall not be required for portable mobile, and transportable medical X-Ray equipment requiring a capacity of not over ____ amps

A

60 Amps

517.71(B)

517 Health Care Facilities

517.71 Connection to Supply Circuit

(B)Portable, Mobile, and Transportable Equipment

Individual branch circuits shall not be required for portable mobile, and transportable medical X-ray equipment requiring a capacity of not over 60 amps.

66
Q

Each general care area patient bed location shall be provided with a minimum of ______ receptacles, which ca ben single, duplex, or a combination with each duplex counting as two receptacles.

A

(4) Four
517. 18(B)

517 Health Care Facilites

(B)Patient Bed Location Receptacles.

Each patien bed location shall be provided with a minimum of FOUR RECEPTACLES. They shall be permitted to be of the single or duplex types or a combination of both. All receptacles, whether four or more, shall be listed “hospital grade” and so identified.

67
Q

Manufactured wiring systems constructed with Type MC cable shall be supported and secured in intervals not exceeding

A

6 feet

330 Metal-Clad cable: Type MC

  1. 30(B)
  2. 30 Securing and Supporting

(B)Securing

Unless otherwise providedm cables shall be secured at intervals not exceeding 6 feet . Cables containing four or fewer conductors sized no larger than 10AWG shall be secured within 12 inches of every box, cabinet fitting,or other cable termination.

68
Q

Knife switches rated for more than 1200 amps at 250 volts or less ______

A

Can only be use as an isolating switch, shall not be opened under load

404 Switches

  1. 13(A)
  2. 13 Knife switches

(A) Isolating switches

Knife switches rated at over 1200 amps at 250 volts or less, and at over 600 amperes at 251 to 600 volts, shall be used only as isolating switches and shall not be opened under load.

69
Q

At least ___125 V, single phase, 15A or 20A, duplex receptacle shall be provided in the elevator hoistway.

A

One(1)

620
Elevators, Dumbwaiters, Escalators, Moving Walkwalks, Platforms & Stairway Chairlifts

  1. 24(C)
  2. 24 Branch Circuit for Hoistway Pit Lighting and Receptacles

(C) Duplex Receptacles

At least one 125-volt, single-phase, 15- or 20- ampere duplex receptacle shall be provided in th hoistway pit.

70
Q

What is the feeder or service calculated load for waste disposal (940 VA), dishwasher (1250 VA), a trash compactor (1100 VA) and a water heater (4500 VA)?

A

5,843

220

Branch ckts, Feeders, and Service Calculations

220.53 Applaince Load-Dwelling Units

It shall be permissibl to apply a demand factor of 75 percent to the nameplate rating load of four or more applicances fastened in place……

940+1250+1100+4500=7790 Calculated load

7790*.75=5843 Calculated load

71
Q

The conductors used to connect the surge protective device to line or bus and to ground shall not be any longer than ____ and shall avoid across its length.

A

shall not be longer than necessary.

285

Surge Protective Devices (SPD’s) 1kV or Less

285.12 Routing of Connections.

The conductors used to connect the SPD ( surge arrester or TVSS) to the line or bus and to ground shall not be any longer than necessary and shall avoid avoid unnecessary bends.

72
Q

What is true about installation of a Type 1 TVSS (transient voltage surge supressor)?

A

Can be connected to the line side of service disconnect

230.82(4)

230 Services

  1. 82 Equipment connected to the supply(line) side of service disconnect
    (4) Instrument transformers(current and voltage),impedance shunts, load managment devices, surge arresters, and Type 1-surge protective devices.
73
Q

Lighting systems operating at 30V or less shall not be installed within _____ ft of pools, spas, fountains, or similar locations.

A

10 feet

411

Lighting systems operating at 30 Volts or Less

  1. 4(B)
  2. 4

Specific Location Requirements

(B)

Pools, Spas, Fountains, and Similar Locations

Lighting systems shall be installed not less than 10 feet horizontally from the nearest edge of water, unless permitted by Article 680

74
Q

The connection of the system bonding jumper for a seperately derived system shall be made ____ on the seperatley derived system from the source to the first disconnecting means or overcurrent devices.

A

At any single point (on the seperatley derived system)

250 Grounding and bonding

  1. 30(A)
  2. 30 Grounding seperatley derived
75
Q

Auxiallry gutters shall be supported throughout their entire length at intervals not exceeding ____ feet if of sheet metal type.

A

5 Feet

366

Auxiallry Gutters

  1. 30(A)
  2. 30 Securing and Supporting.

(A) Sheet Metal Auxiliary Gutters.

Sheet metal auxiliary gutters shall be suported t_hroughout their entire length at intervals not exceeding 5 feet._

76
Q

Plug fuses of 15 ampere and lower rating shall be identified by a _____ configruation of window, cap, or other prominent part to distinguish them from fuses of higher ampere ratings.

A

Hexagonal

240 Overcurrent Protection

  1. 50(C)
  2. 50 General

(C)Hexagonal Configuration

Plug fuses of 15 ampere or lower rating shall be identified by a hexagonal configuration of the window, cap or other prominent part to distinguish them from fuses of higher ampere ratings.

77
Q

Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of _____ horizontally shall be provided.

A

36 inches (NYC amendment)

110

Requirements for Electrical Installations

  1. 34(A)
  2. 34 Work Space and Guarding

(A) Working space

Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of 900 mm (36 in.) horizontally shall be provided.

78
Q

Office furnishing connected with receptacles shall be connected to?

A

The buildings electrical system

605

Office Furnishings ( Consisting of Lighting Accesories and Wired Partitions)

605.6 NYC Amenedment

Fixed-Type and Freestanding-Type partitions.

Wired partitions that are fixed (secured to building surfaces) or freestanding ( not fixed ) shall be permanently connected to the buidling electrical system by one of the wiring methods of his code. Where liquidtight flexible metal conduit is used, the maximum lenghth shall be 18 inches.

79
Q

ENT and fittings can be _______, _______ provided fittings identified for this purpose are used.

A

1) Encased in poured concrete
2) Embedded in concrete slab on grade wehre the tubing is placed on sand or approved screening.

362

Electrical Nonmetallic Tubing

  1. 10(6)
  2. 10 Uses Permitted
    (6) Encased in poured concrete, or embedded in a concrete slab on grade where ENT is placed on sand or approved screenings, provided fitting identified for this purpose are used for connections.
80
Q

Service drops insatalled over roofs shall have a vertical clearance of ______ above the roof surface, unless a lesser distance is permitted by an exception

A

8 feet

230 Services

  1. 24(A)
  2. 24 Clearances

(A) Above Roofs

Conductors shall have a verical clearance of not less than 8 Feet above the roof surface. The vertical clearance must be maintained for a distance of not less than 3 feet in all directions from the edge of the roof.

81
Q

In straight pull, the length of the box shall not be less than _____ times the trade size of the largest raceway.

A

8 times, is straight

(6 times is angle, or U pulls)

314 Outlet, Device, Pull and Junction Boxes; Conduit Bodies, Fittings, And Handholes

  1. 28(A)(1)
  2. 28 Pull and Junction Boxes and Conduit Bodies

(A) Minimum Size. For raceways containing conductors of 4AWG or larger that are required to be insulated, and for cables containing conductors of 4 AWG or larger, the minimum dimensions of pull or junction boxes installed in a raceway or cable run shall comply with (A)(1) through (A)(3). Where an enclosure of entering raceways, the diameter shall be the metric designator (trade size) expressed in the units of measurement employed

(1)Straight Pulls

In straight pulls, the length of the box shall not be less than eight times the metric designator (trade size) of the largest raceway.

82
Q

Ground-fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts-to-ground, but not exceeding 600 V phase-to-phase for each service disconnecting means rated ____.

A

1000 A

230 Services

230.95 Ground-Fault Protection of Equipment

Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150-volts to ground but not exceeding 600 volts phase-to-phase for each service disconnect rated 1000 amperes or more. The grounded conductor for the solidly grounded wye system shall be connected directly to ground through a grounding electrode system

83
Q

Where conductors of different systems are installed in the same raceway, one system shall have a neutral having an outer cover of white or natural gray and each other system having a neutral shall have another covering of _____.

A

White with colored stripe other than green or distinguished by other suitable approved means.

200

Requiements for Electrical Installations of Grounded Conductors.

  1. 6(D)(2)
  2. 6 Means of Identifying Grounded Conductors.

(D) Grounded Conductors of Different Systems

(2) The grounded conductor(s) of different systems are installed in the same raceway, cable, box, auxiliary gutter, or other type of enclosure, each grounded conductor shall be identified by system. Identification that distinguishes each system grounded conductor shall be permitte by one of the following:

… an outer covering of white or gray with a readily distinguishable colored stripe other than green running along the insualation.

84
Q

An insulated grounded conductor of ______ or smaller shall be identified by a continuous white or gray outer finish, or by three continious white stripes on other than green insulation along its entire length.

A

6AWG

200 Requirements for electrical installations of grounded conductors.

  1. 6(A)
  2. 6 Means of Identifying Grounded Conductors.

(A) Sizes 6 AWG or smaller.

An insulated grounded conducotr of 6 AWG or smaller shall be identified by a continious white or gray outer finish or by three continious white stripes on other than green insulation along its entire length.

85
Q

Where the service overcurrent protective device rating or setting is above ____ amps, such device shall be selectively coordinated with the next downstream

A

601 Amps

240

Overcurrent Protection

  1. 12 (A) -NYC amendments
  2. 12 Cleand surfaces

(A)Where the service overcurrent protective device rating or setting is above 601 amps, such device shall be selectively coordinated with the next downstream OCPD.

86
Q

Low Voltage Lightining Systems operating at 30 Volts or less shall be supplied from a maximim _____ amp branch circuit.

A

20 ampere branch ckt.

411

Lighting systems operating at 30 volts or less

411.6 Branch Circuit

Lighting systems operating at 30 volts or less shall be supplied from a maximum 20- ampere branch circuit.

87
Q

Rigid metal conduit that is directly buried outdoors shall have at least _____ of cover.

A

6 Inches

300 Wiring Methods

  1. 5 Underground Installations
  2. 5, Table Column 2
88
Q

What is the maximum run length of 18 AWG fixture wire that is tapped on to a 20 amp branch circuit?

A

50 Feet

240

Overcurrent Protection

  1. 5(B)(2)(1)
  2. 5 Protection of Flexible Cords, Flexible Cables, and Fixture Wires

(B) Branch-Circuit Overcurrent Device

(2) Fixture Wires
(1) 20-ampere circuits- 18AWG, up to 50 feet of run length.

89
Q

Temporary electrical power and lighting insstallations shall be permitted for a period not exceeding ___ days for Christmas decorative lighting and similar purposes.

A

90 days

590 Temporary Installations

  1. 3(B)
  2. 3 Time Constraints

(B) 90 Days.

Temporary electric power and lighting installations shall be permitted for a period not to exceed 90 Days for holiday decorative lighting and similar puposes.

90
Q

The number of receptacle outlets for guest rooms in hotels and motels shall not be less than that required for a dwelling unit. These receptacles can be located to be onvenient for permanent furniture layout but at least __ receptacle outlets shall be readily accesible.

A

2

210

Branch Circuits

  1. 60 (B)
  2. 60

Guest Rooms, Guest Suites, Dormitories, and Similar Occupancies

(B) Receptacle Placement.

….. At least two receptacle outlets shall be readily accesible.

91
Q

A load demand factor of 75 percent is permitted for ____ or more appliances fastened in place such as waste disposal, diswashers, trash compactors, water heaters, etc…

A

Four

220 Branch Circuits

220.53

Appliance Load - Dwelling Unit(s)

It shall be permissible to apply a demand factor of 75 percent 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.

NEC 2008 (7 decks)

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