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Type AC cable is manufactured with ____ phase conductors.


A) two
B) three
C) four
D) all of these

E) All of the above
F) A) and B)

Correct Answer

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In which location(s) is Type NM cable NOT allowed to be run?


A) Concealed in dry locations
B) Damp and moist locations
C) Exterior masonry block or tile walls
D) Both b and c

E) None of the above
F) A) and B)

Correct Answer

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Under certain circumstances, the grounded (neutral) conductors of a residential service ____ permitted to be sized smaller than the phase conductors.


A) are
B) are not

C) A) and B)
D) undefined

Correct Answer

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Match the following conductor insulations with their temperature rating. -Type TW


A) 60°C
B) 75°C
C) 90°C

D) All of the above
E) A) and B)

Correct Answer

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The ampacity of Type NM cable shall be in accordance with ____ conductor temperature rating.


A) 60°C (140°F)
B) 75°C (167°F)
C) 90°C (194°F)
D) None of the above

E) A) and D)
F) B) and C)

Correct Answer

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Conductor sizes up through 4/0 AWG are expressed in American Wire Gauge (AWG) . Conductor sizes larger than 4/0 AWG are expressed in ____.


A) metric units
B) kcmil
C) diameter
D) radians

E) A) and D)
F) A) and C)

Correct Answer

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Article 210 applies to branch circuits, but branch-circuit calculations are covered in ____.


A) Article 220
B) Article 230
C) Article 240
D) Article 250

E) B) and D)
F) A) and C)

Correct Answer

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What is the difference between Type NM-B and Type NMC-B cable?

Correct Answer

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NM-B has a flame-retardant, mo...

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Although the National Electrical Code contains requirements for making holes and notches in framing members, in order to protect the cables installed in them, electricians must also be aware that ____________________ also have requirements for holes and notches in framing members, in order not to weaken the structure of the building.

Correct Answer

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Match the following conductor insulations with their temperature rating. -Type THHN


A) 60°C
B) 75°C
C) 90°C

D) A) and B)
E) None of the above

Correct Answer

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The total rating of utilization equipment fastened in place, other than luminaires (lighting fixtures) , shall not exceed ____ 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.


A) 30
B) 50
C) 75
D) 90

E) A) and B)
F) B) and C)

Correct Answer

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Explain what flexible metallic and nonmetallic conduits are typically used for in residential construction.

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These are used for connections...

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The rating of a branch circuit is determined by its ____.


A) overcurrent protective device (fuse or circuit-breaker)
B) wire size
C) demand factor
D) connected load

E) A) and C)
F) All of the above

Correct Answer

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Low voltage (high voltage drop) in a home can be caused by ____.


A) a conductor that is too small for the load
B) a circuit that is too long
C) poor connections at the terminals
D) all of these

E) B) and C)
F) B) and D)

Correct Answer

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A dual-rated conductor marked THHN/THWN is rated ____ when used in dry locations.


A) 90°C (194°F)
B) 75°C (167°F)
C) 60°C (140°F)
D) 30°C (86°F)

E) A) and C)
F) B) and C)

Correct Answer

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Explain what must be done when cables are bundled together for more than 24 inches.

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The heat generated by the bund...

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Type ____ is the most common building wire used today.


A) THW
B) THHN/THWN
C) RUW
D) RUH

E) C) and D)
F) B) and D)

Correct Answer

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The NEC recommends a voltage drop no greater than ____________________ percent for feeders and no greater than ____________________ percent total for feeders and branch circuits together.

Correct Answer

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3, 5
three...

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Explain what must be done if cable holes through studs cannot be bored to meet the requirements of the NEC or if cables are to be laid in notches or grooves cut into the face of the stud.

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A steel plate, sleeve, or clip...

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Showing 21 - 39 of 39

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