Journeyman Electrician Practice Test
Exam Question & Answers ( Latest 2025)
Conductors with _____ marked on the insulation are NOT approved for
use in a wet location. - CORRECT ANSWERS ✔✔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? - CORRECT ANSWERS ✔✔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 _____. - CORRECT ANSWERS
✔✔625 amperes
,Journeyman Electrician Practice Test
Exam Question & Answers ( Latest 2025)
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? - CORRECT ANSWERS ✔✔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 _____ . - CORRECT ANSWERS ✔✔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
_____. - CORRECT ANSWERS ✔✔8 AWG copper
, Journeyman Electrician Practice Test
Exam Question & Answers ( Latest 2025)
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. - CORRECT ANSWERS ✔✔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.
Why is electrical continuity required for metallic conduit? - CORRECT
ANSWERS ✔✔To establish an effective ground-fault path and
facilitate the operation of the over-current protective device.
Electrical continuity is required for metallic conduit to establish an
effective ground-fault path and facilitate the operation of the
overcurrent protective device.
Exam Question & Answers ( Latest 2025)
Conductors with _____ marked on the insulation are NOT approved for
use in a wet location. - CORRECT ANSWERS ✔✔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? - CORRECT ANSWERS ✔✔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 _____. - CORRECT ANSWERS
✔✔625 amperes
,Journeyman Electrician Practice Test
Exam Question & Answers ( Latest 2025)
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? - CORRECT ANSWERS ✔✔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 _____ . - CORRECT ANSWERS ✔✔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
_____. - CORRECT ANSWERS ✔✔8 AWG copper
, Journeyman Electrician Practice Test
Exam Question & Answers ( Latest 2025)
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. - CORRECT ANSWERS ✔✔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.
Why is electrical continuity required for metallic conduit? - CORRECT
ANSWERS ✔✔To establish an effective ground-fault path and
facilitate the operation of the over-current protective device.
Electrical continuity is required for metallic conduit to establish an
effective ground-fault path and facilitate the operation of the
overcurrent protective device.
