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Holt, Electricians Exam Prep, Unit 6(Latest Exam 2024)
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Holt, Electricians Exam Prep, Unit6(Latest Exam 2024)
Conductor Insulation Properties: Table _____ of the NEC
provides information on conductor properties such as
permitted use, maximum operating temperature and
other insulation details. - correct answers✅310.104(a)
TW can be described as thermoplastic insulation, suitable
for dry or wet locations with a maximum operating
temperature of 60 degrees C(True/False) - correct
answers✅True
TFFN can be described as stranded fixture wire with
thermoplastic insulation, nylon cover. (True/False) -
correct answers✅True
The ampacity of a conductor is listed in table _____ under
the condition of no more than three current carrying
conductors bundled together in raceway, cable or earth
an ambient temperature of 86 degrees F. - correct
answers✅310.15(b)(16)
The ampacities listed in Table 310.15(b)(16) are based on
temperature alone and do not take _____ into account. -
correct answers✅Voltage drop
Voltage drop considerations are for ________ and not for
safety; therefore, sizing conductors for voltage drop is not
,Holt, Electricians Exam Prep, Unit
6(Latest Exam 2024)
a Code requirement. - correct answers✅Efficiency of
operation
The smallest size conductor permitted by the NEC for
branch circuits, feeders or services is _____ copper or
_____ aluminum. - correct answers✅No. 14, No. 12
When selecting a conductor for a circuit, always select
the conductors not smaller than the _______ of the
equipment. - correct answers✅Terminal ratings
(110-14(c)(1) ) Equipment rated at 100 ampere or less
shall have the conductor sized no smaller than _____
degrees C unless the terminals are marked otherwise. -
correct answers✅60
(110-14(c)(1) )What size THHN conductor is required for a
50 ampere circuit, listed for use at 60 degrees C? -
correct answers✅No. 6
What size THHN conductor is required for a 50 ampere
circuit, listed for use at 75 degrees C? - correct
answers✅No. 8
,Holt, Electricians Exam Prep, Unit
6(Latest Exam 2024)
(110-14(c)(2) )Terminals for equipment rated over 100
ampere and pressure connector terminals for conductors
larger than No. 1 shall have the conductor sized
according to the _____ temperature rating listed in Table
310.15(B)(16) - correct answers✅75 degree
What size THHN conductor is required to supply a 225
ampere feeder? - correct answers✅4/0
Parallel conductors (electrically joined at both ends)
permit a smaller ________ per ampere. This can result in a
significant cost savings for circuits over 300 amperes. -
correct answers✅Cross-sectional area
What size 75 degree C conductors are required for a 600
ampere service that has a calculated demand load of 550
amperre? - correct answers✅1250 kcmil
What size conductors(2) would be required in one
raceway (nipple) for a 600 ampere service? The
calculated demand load is 550 ampere. - correct
answers✅300 kcmil
When equipment grounding conductors are installed with
circuit conductors that are run in parallel, each raceway
must have an equipment grounding conductor sized
, Holt, Electricians Exam Prep, Unit
6(Latest Exam 2024)
according to the overcurrent protection device protecting
the circuit.(True/False) - correct answers✅True
What size equipment grounding conductor is required in
each of two raceways for a 600 ampere feeder?(Table
250.122) - correct answers✅No. 1
Overcurrent protection devices have two ratings,
overcurrent and _________. - correct answers✅Ampere
interrupting current(AIC)
Ampere interrupting current (AIC) is for short circuit
faults. They are meant to protect a device from _______
while trying to clear a fault. - correct
answers✅Exploding
The minimum interruption rating is _____ ampere for
circuit breakers and _____ ampere for fuses. - correct
answers✅5000, 10000
Continuous Load Protection: Overcurrent protections
devices are sized at no less than ____ percent of the
continuous load, plus _____ percent of the noncontinuous
load. - correct answers✅125, 100
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