Journeyman Electrician Practice Test
2023
Conductors with _____ marked on the insulation are NOT approved for use in a wet
location. -
... [Show More] ANS-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? - ANS-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 _____. - ANS-625 amperes
To find the full-load current rating of the single-phase transformer apply the singlephase 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? -
ANS-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 _____ . -
ANS-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... [Show Less]