age 1 of 55
The electrical NCCER Exam Questions All Solved
Correctly 2025/2026
Which Article of the NEC covers grounding?
......ANSWER........article 250
Which of the following is a 90 degree, explosion proof fitting?
......ANSWER........GUAL
What is a dropout plate? ......ANSWER........Metal plate with a
curved surface for cable to follow as it passes from the tray
All of the following are common service voltages in the United
States EXCEPT: ......ANSWER........372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? ......ANSWER........Opens a circuit
to prevent operation of an electrical device
,age 2 of 55
What will happen when one or more coils in a winding are
grounded? ......ANSWER........The motor will automatically blow
fuses
Eight incandescent lighting fixtures are to be installed. Each
fixture is 120- volts, with a 200-watt lamp. What is the total
connected load? ......ANSWER........13.3 amps
The must be grounded in a bussed gutter if used as the main
service equipment. ......ANSWER........Neutral busbar
When wall mounting cable tray, ensure that ......ANSWER........The
building structure is strong enough to support the tray system
The purpose of sealing cable ends when reels of cable are in
storage is ......ANSWER........To keep moisture from creeping in
,age 3 of 55
The outer covering on liguid-tight flexible metal conduit is used
for ......ANSWER........A moisture seal
A good electrical connection should ......ANSWER........Be
mechanically and electrically secure
The symbol normally used for duplex ......ANSWER........Circle
with two parallel lines drawb through it
Disconnecting means are covered in ......ANSWER........NEC
Section 110-22
In relation to switches, the term throw refers to the
......ANSWER........Number of internal operations that a switch can
perform
A 3-phase, 4-wire, 480v service requires ______ current
transformer(s) ......ANSWER........3
, age 4 of 55
Services conductors and equipment are covered in
......ANSWER........NEC Article 230
The NEC required that all receptacles installed on 25 amp and
20 amp branch circuits be ______ receptacles
......ANSWER........Grounding
A transformer with the primary of 400 turns and a secondary of
300 turns has a _____ ......ANSWER........Step-down turns ratio of
4:3
The circular mil is based on the ......ANSWER........Cross-sectional
area of the wire
Of the termination classes listed below, ____ is the only one that
provides a seal against external elements.
......ANSWER........Class 1
The electrical NCCER Exam Questions All Solved
Correctly 2025/2026
Which Article of the NEC covers grounding?
......ANSWER........article 250
Which of the following is a 90 degree, explosion proof fitting?
......ANSWER........GUAL
What is a dropout plate? ......ANSWER........Metal plate with a
curved surface for cable to follow as it passes from the tray
All of the following are common service voltages in the United
States EXCEPT: ......ANSWER........372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? ......ANSWER........Opens a circuit
to prevent operation of an electrical device
,age 2 of 55
What will happen when one or more coils in a winding are
grounded? ......ANSWER........The motor will automatically blow
fuses
Eight incandescent lighting fixtures are to be installed. Each
fixture is 120- volts, with a 200-watt lamp. What is the total
connected load? ......ANSWER........13.3 amps
The must be grounded in a bussed gutter if used as the main
service equipment. ......ANSWER........Neutral busbar
When wall mounting cable tray, ensure that ......ANSWER........The
building structure is strong enough to support the tray system
The purpose of sealing cable ends when reels of cable are in
storage is ......ANSWER........To keep moisture from creeping in
,age 3 of 55
The outer covering on liguid-tight flexible metal conduit is used
for ......ANSWER........A moisture seal
A good electrical connection should ......ANSWER........Be
mechanically and electrically secure
The symbol normally used for duplex ......ANSWER........Circle
with two parallel lines drawb through it
Disconnecting means are covered in ......ANSWER........NEC
Section 110-22
In relation to switches, the term throw refers to the
......ANSWER........Number of internal operations that a switch can
perform
A 3-phase, 4-wire, 480v service requires ______ current
transformer(s) ......ANSWER........3
, age 4 of 55
Services conductors and equipment are covered in
......ANSWER........NEC Article 230
The NEC required that all receptacles installed on 25 amp and
20 amp branch circuits be ______ receptacles
......ANSWER........Grounding
A transformer with the primary of 400 turns and a secondary of
300 turns has a _____ ......ANSWER........Step-down turns ratio of
4:3
The circular mil is based on the ......ANSWER........Cross-sectional
area of the wire
Of the termination classes listed below, ____ is the only one that
provides a seal against external elements.
......ANSWER........Class 1
