1|Page
Journeyman Electrician Practice Test Questions
and Answers 100% Pass
Conductors with _____ marked on the insulation are NOT approved for use in a wet location. -
✔✔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? - ✔✔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 _____. - ✔✔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? - ✔✔75 amperes
Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE
, 2|Page
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 _____ . - ✔✔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.
In general, overhead service-drop conductors shall NOT be smaller than _____. - ✔✔8 AWG copper
overhead service-drop conductors to be not smaller than 8 AWG copper or 6 AWG aluminum or copper-
clad aluminum. Do not get service-drop conductors, the overhead conductors between the utility electric
supply system and the service point, confused with the service-entrance conductors, the conductors from
the service point from the utility company to the service disconnecting means.
When a galvanized eye-bolt is to be used as the point of attachment for an electrical service, the NEC
requires the eye-bolt to be installed NOT less than _____ above finished grade. - ✔✔10 ft.
provide adequate vertical clearance of the conductors and prevent physical damage to the conductors
and prevent persons from making accidental contact with the conductors which may create a shock
hazard or electrocution. In no case shall the point of attachment of the service-drop conductors to be less
than 10 ft. above finished grade.
Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE
Journeyman Electrician Practice Test Questions
and Answers 100% Pass
Conductors with _____ marked on the insulation are NOT approved for use in a wet location. -
✔✔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? - ✔✔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 _____. - ✔✔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? - ✔✔75 amperes
Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE
, 2|Page
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 _____ . - ✔✔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.
In general, overhead service-drop conductors shall NOT be smaller than _____. - ✔✔8 AWG copper
overhead service-drop conductors to be not smaller than 8 AWG copper or 6 AWG aluminum or copper-
clad aluminum. Do not get service-drop conductors, the overhead conductors between the utility electric
supply system and the service point, confused with the service-entrance conductors, the conductors from
the service point from the utility company to the service disconnecting means.
When a galvanized eye-bolt is to be used as the point of attachment for an electrical service, the NEC
requires the eye-bolt to be installed NOT less than _____ above finished grade. - ✔✔10 ft.
provide adequate vertical clearance of the conductors and prevent physical damage to the conductors
and prevent persons from making accidental contact with the conductors which may create a shock
hazard or electrocution. In no case shall the point of attachment of the service-drop conductors to be less
than 10 ft. above finished grade.
Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE
