Journeyman Electrician Practice Test
Exam Questions & Answers (Grade
A+)
Conductors with _____ marked on the insulation are NOT approved
for use in a wet location. -
correct 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? -
correct 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.
,Journeyman Electrician Practice Test
Exam Questions & Answers (Grade
A+)
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 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? -
correct 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 _____ . -
correct answer ✅6 inches
, Journeyman Electrician Practice Test
Exam Questions & Answers (Grade
A+)
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 answer ✅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. -
correct answer ✅10 ft.
Exam Questions & Answers (Grade
A+)
Conductors with _____ marked on the insulation are NOT approved
for use in a wet location. -
correct 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? -
correct 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.
,Journeyman Electrician Practice Test
Exam Questions & Answers (Grade
A+)
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 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? -
correct 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 _____ . -
correct answer ✅6 inches
, Journeyman Electrician Practice Test
Exam Questions & Answers (Grade
A+)
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 answer ✅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. -
correct answer ✅10 ft.
