Practice Test Journeyman Electrician
Questions with All Solved Solutions
2025-2026 Set.
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
, 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 _____. - 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. - Answer
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? - Answer 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.
In dwelling units, receptacle outlets installed for countertop surfaces, must be located above,
but NOT more than _____ above the countertop or work surface. - Answer 20 inches
receptacle outlets installed for countertop or work surfaces in dwelling units may be located on
or above, but not more than 20 in. above the countertop or work surface. The intent of this rule
is to eliminate the use of unsightly extension cords (which reduces the amount of usable
countertop space) on the countertop or work surface to supply cord-and-plug connected
appliances. Also, receptacles located more than 20 inches above countertops or work surfaces
may interfere with the cabinetry to be installed.
Questions with All Solved Solutions
2025-2026 Set.
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
, 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 _____. - 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. - Answer
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? - Answer 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.
In dwelling units, receptacle outlets installed for countertop surfaces, must be located above,
but NOT more than _____ above the countertop or work surface. - Answer 20 inches
receptacle outlets installed for countertop or work surfaces in dwelling units may be located on
or above, but not more than 20 in. above the countertop or work surface. The intent of this rule
is to eliminate the use of unsightly extension cords (which reduces the amount of usable
countertop space) on the countertop or work surface to supply cord-and-plug connected
appliances. Also, receptacles located more than 20 inches above countertops or work surfaces
may interfere with the cabinetry to be installed.
