Study Guide Flashcards
The setting for an overload relay is found to be insufficient to start a motor. The motor is a 230-volt, single phase 1/2 horsepower, continuous duty with a service factor of 1 and a temperature rise of 50 degrees centigrade (motor is automatically started). In order to use higher size overloads, they must be sized at ______ percent of the motor’s nameplate full-load current.
A. 115
B. 125
C. 130
D. 140
C. 130
430.32(G)
One 10 kW range, one 15 kW range, and one 24 kW range are to be installed in a multifamily dwelling. The total line feeder demand for these ranges is ______ VA.
A. 14,000
B. 17,000
C. 17,500
D. 24,000
C. 17,500
T 220.55
The line feeder demand for one 10 kW, single-phase electric range installed in a dwelling unit is ______ VA.
A. 8,000
B. 9,000
C. 11,000
D. 12,000
A. 8,000
T 220.55
An apartment complex has a 10 kW range in each of 48 units. The total line feeder demand for these ranges is ______ watts.
A. 36,000
B. 46,000
C. 61,000
D. 63,000
C. 61,000
T 220.55
What is the service neutral load (VA) for the electric ranges installed in a 6 unit, multifamily dwelling when the ranges are rated 9 kW, 9 kW, 10 kW, 11 kW, 12 kW, and 12 kW?
A. 12,400 VA
B. 14,700 VA
C. 15,400 VA
D. 16,100 VA
B. 14,700 VA
T 220.55
220.61
Where motor overload protection is external to the appliance, the appliance shall be required to be ______.
A. Approved
B. Identified
C. Listed
d. Marked
d. Marked
422.11(G)
A unit switch or switches with a marked “off” position that is part of an appliance and that disconnects all ____ conductors shall be permitted as the disconnecting means where other means for disconnection are provided.
A. Current carrying
B. Grounded
C. Grounding
D. Ungrounded
D. Ungrounded
422.34
Requirements for installing cord-and-plug connected built-in dishwashers and trash compactors state that the receptacle shall be located in the space occupied by the appliance, that the receptacle be accessible and that the cord shall be _____ long, measured from the face of the attachment plug to the plane of the rear of the appliance.
A. 2 to 3
B. 3 to 4
C. 3 to 5
D. 4 to 6
B. 3 to 4
422.16(B)(1)
What is the minimum size THHN copper branch-circuit conductors required to be installed to supply a 50 gallon water heater with a. Nameplate rating of 24 amperes?
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
B. 10 AWG
422.13
(120 gal or less is considered continuous)
The branch of circuit rating of a water heater (appliance) that is continuously loaded shall not be less than ______ percent of the marked rating.
A. 80
B. 125
C. 140
D. 175
B. 125
422.10(A)(3)
What size overcurrent protective device is required to protect an 80 gallon water heater whose nameplate ampacity rating is marked 28 amperes?
A. 20 ampere
B. 30 ampere
C. 35 ampere
D. 40 ampere
C. 35 ampere
Code Ref?
In other than fixed electric space-heating equipment, a(n) ______ shall supply central heating equipment.
A. Cord-and-plug attached branch circuit
B. Individual branch-circuit
C. Small appliance branch-circuit
D. Ungrounded branch-circuit
B. Individual branch-circuit
424.4(A)
Overcurrent protection for the branch-circuit supplying an electric furnace shall comply with the provisions of Section ______.
A. 210.20
B. 422.11
C. 426.52
D. 665.11
B. 422.11
One of the conditions which must be met for a room air conditioner to be considered a single motor unit requires the rating to be not more than ______ amperes and 250 volts, single-phase.
A. 30
B. 35
C. 40
D. 50
C. 40
440.62(A)(2)
Single-phase, cord-and-plug connected room air conditioners shall be provided with factory installed LCDI, HDCI, or ______ protection
A. AFCI
B. GFCI
C. IDCI
D. LIDI
A. AFCI
440.65
A(n) ______ is defined as operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating.
A. ground-fault
B. Overcurrrent
C. Overload
D. Short-circuit
C. Overload
100
A _____ fault condition represents a “solid” connection of relatively low or assumed “zero” impedance.
A. Arcing
B. Bolted
C. Grounding
D. Shorting
B. Bolted
OCPD ratings include all of the following EXCEPT ______.
A. Ampere
B. Impedence
C. Interrupting rating
D. Voltage
B. Impedence
The ampere rating of a fuse or a circuit breaker normally should not exceed the current carrying capacity of the ______.
A. Buildings
B. Conductors
C. Equipment
D. Panelboard
B. Conductors
The rating which defines the capacity of an OCPD to maintain its integrity when reacting to fault currents is referred to as its ______.
A. Continuous-ampere rating
B. Ground-fault rating
C. Interrupting rating
D. Voltage rating
C. Interrupting rating
The types of molded case circuit breakers include all of the following EXCEPT ______.
A. Electronic
B. Magnetic-only trips
C. Thermal magnetic
D. Thermal-only trips
D. Thermal-only trips
For a circuit breaker to trip, due to an overcurent, the ______ must sense the overcurrent and release (unlatch) the contacts.
A. Arc chutes
B. Release relay
C. Terminals
D. Trip unit
D. Trip unit
With electronic trip molded case circuit breakers, a ______ is used in each current phase to monitor and reduce the current to the proper input level required by the electronic trip unit.
A. Current transformer
B. Potentiometer
C. T-coil
D. Trip unit element
A. Current transformer
Under normal operation, when a fuse is operating at or near its ampere rating, it simply functions as a ______.
A. Appliance
B. Conductor
C. Heat sink
D. Load
B. Conductor
The basic functional component of a fuse is the ______.
A. Barrel
B. Blade
C. Ferrell
D. Link
D. Link
A ______ protective device is one which cuts off a fault current in les than one half cycle.
A. Class H
B. Current-limiting
C. Fast-acting
D. Voltage-sensitive
B. Current-limiting
Calculate the lighting load for a three-story, single family dwelling that has 975 sq. ft. of space for each floor.
A. 1,463 VA
B. 2,925 VA
C. 7,620 VA
D. 8,775 VA
D. 8,775 VA
220.41
Which voltage listed below cannot be used for the purposes of computing branch-circuit and feeder loads?
A. 208Y/120
B. 480Y/208
C. 480Y/277
D. 600Y/347
B. 480Y/208
220.5(A)
A continuous load is a load where the maximum current is expected to continue for ______ hours or more.
A. One
B. Two
C. Three
D. Four
C. Three
The minimum rating of an overcurrent protective device required to serve a fixed electric space heating load of 16 amperes is ______ amperes.
A. 15
B. 20
C. 25
D. 30
B. 20
424.4(B)
What is the computed load for the general lighting of a 2,000 square foot single-family dwelling?
A. 2,000 VA
B. 3,500 VA
C. 4,200 VA
D. 6,000 VA
D. 6,000 VA
Code Ref?
It shall be permissible to apply a demand factor of ______ 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 factor in a one-family, two-family, or multifamily dwelling.
A. 70
B. 75
C. 80
D. 125
B. 75
229.53
How many 120 volt, 15 ampere lighting circuits are required for a dwelling unit with a computed lighting load of 27,000 VA?
A. 5
B. 10
C. 15
D. 20
C. 15
Code Ref?
How many 120 volt, 15 ampere lighting circuits are required for a dwelling unit with a computed lighting load of 25,000 VA?
A. 8
B. 10
C. 12
D. 14
D. 14
Code Ref?
The minimum number of 120 Volt, 15 ampere lighting circuits required for a dwelling unit with a computed load of 18,000 VA is ______.
A. 6
B. 7
C. 8
D. 10
D. 10
The total lighting feeder demand (line and neutral) for a 3000 square foot dwelling unit, including two small appliance circuits and one laundry branch circuit, is ______ VA. Apply the demand factors of Section 220.42
A. 5415
B. 6,675
C. 12,500
D. 13,500
B. 6,675
In each dwelling unit, the feeder load shall be computed at ______ volt-amperes for each 2-wire small appliance branch circuit required by Section 220.18(B) for small appliances supplied by 15 or 20 ampere receptacles on 20 ampere branch circuits in the kitchen, pantry, dining room, and breakfast room.
A. 1,000
B. 1,200
C. 1,500
D. 2,400
C. 1,500
Each unit of a twelve-unit multifamily dwelling is 1,475 square feet and is supplied by a 120/240 volt, three-wire system. The minimum number of 15 ampere lighting branch circuits required for each unit is ______.
A. One
B. Two
C. Three
D. Four
C. Three
For a feeder supplying household electric ranges, wall-mounted ovens, counter-mounted cooking units, and electric dryers, the maximum unbalanced load shall be considered as ______ percent of the load on the ungrounded conductors, as determined in accordance with Table 220.55 for ranges and Table 220.54 for dryers.
A. 70
B. 75
C. 80
D. 125
A. 70
A multifamily dwelling complex consists of 24 units. Each of the units has a 120/240 volt, 6 kW dryer. The dryer load feeder demand for the line is ______ VA.
A. 48,000
B. 49,680
C. 120,000
D. 144,000
B. 49,680
Determine the line feeder demand for six 5 kW household dryers installed in a multifamily dwelling.
A. 5,000 VA
B. 15,000 VA
C. 22,500 VA
D. 30,000 VA
C. 22,500 VA
220.54
A maintenance disconnecting means shall be provided and be accessible, located within ______ from all pools, spas, and hot tub equipment.
A. 10 feet
B. 12 feet
C. 45 feet
D. sight
D. sight
680.13
All 125V, single-phase receptacles within ______ feet measured horizontally of the inside walls of a hydromassage tub shall be protected by a ground fault circuit interrupter.
A. 6
B. 8
C. 10
D. 12
A. 6
Where a permanently installed pool is installed at a dwelling unit(s), at least one 125V, 15 or 20 ampere receptacle on a general-purpose branch circuit shall be located a minimum of ______ feet from and not more than ______ feet from the inside wall of the pool.
A. 6 / 20
B. 6 / 25
C. 10 / 10
D. 10 / 15
A. 6 / 20
680.22(A)(1)
