Journeyman Electrician Practice Test QUESTIONS & ANSWERS(RATED A)
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Course
Journeyman Electrician
Institution
Journeyman Electrician
Conductors with _____ marked on the insulation are NOT approved for use in a wet location. - ANSWER THHN
conductors with THHN insulation are approved for use in dry and damp locations only and conductors with THWN, THHW, and THW insulation are recognized for use in dry and wet locations.
Give...
Journeyman
Electrician
Practice Test
QUESTIONS &
ANSWERS(RAT
ED A)
Conductors with _____ marked on the insulation are NOT approved for use in a wet location. - ANSWER
THHN
, conductors with THHN insulation are approved for use in dry and damp locations only and conductors
with THWN, THHW, and THW insulation are recognized for use in dry and wet locations.
Given: A one-family dwelling unit with a demand load of 200 amperes is supplied with a 120/240 volt,
single-phase, electrical system from the local utility company. What is the MINIMUM size aluminum
THW conductors required for use as service-entrance conductors for this residence? - ANSWER 4/0 AWG
one-family dwelling 120/240 volt, single-phase, service-entrance conductors to be sized at an ampacity
of not less than 83% of the service rating. Therefore, 200 amperes x 83% = 166 amperes; size 4/0 AWG
THW aluminum conductors with an allowable ampacity of 180 amperes should be selected for this
dwelling.
Where a 150 kVA, single-phase transformer having a secondary voltage of 120/240 is installed at a multi-
family dwelling, the full-load current rating, in amperes, of the secondary is _____. - ANSWER 625
amperes
To find the full-load current rating of the single-phase transformer apply the single-phase current
formula as shown:I = (150 kVA x 1000) / 240 volts = 15,000/240 = 625 amperes
Which one of the following listed circuit breakers is NOT a standard ampere rating? - ANSWER 75
amperes
the standard ampere ratings for fuses and circuit breakers. A circuit breaker with an ampere rating of 75
amperes is not a standard ampere rating.
The MINIMUM length of free conductor to be left at each junction box for the purpose of splicing
conductors, or making connections to illuminares or devices shall be _____ . - ANSWER 6 inches
free conductor is to be left at each junction box for splices or the connection of luminaires or devices.
The intent of this rule is to ensure enough conductor slack for the terminal connections or splices to be
made easily.
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