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IEC YEAR 2 FINAL EXAM QUESTIONS
AND ANSWERS 2025
Anex _____ in the NEC contains examples of load calculations
for dwellings. - correct answer- D
Which of the installations listed below would be a wet location?
-a receptacle installed on the exterior wall of a building
- a run of PVC conduit installed on a fishing pier
-a luminaire installed on a parking lot pole - correct answer- all
of these
Which of the following is an example of a bare conductor?
- a 12 awg THHN copper wire
- the bare ground wire contained within romex (NM cable)
sheathing
-the bare aluminum wire twisted with triplex - correct answer-
the bare aluminum wire twisted with triplex
Which of the following statements is TRUE for an individual (or
dedicated) branch circuit that is run in a conduit with other
circuits? - correct answer- it can share a neutral with another
circuit
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Equipment designed to open circuits under ____ shall have an
interrupting rating not less than the nominal circuit voltage and
the current that is available at the line side of the equipment.
- short circuit
-overload
-ground fault - correct answer- all of these
The NEC permits the insulation for an ungrounded conductor to
be _____ in color.
- orange
-black
-brown
-yellow - correct answer- any of these
Which of the following locations requires that a three-way
switch be installed at the lower landing and another three-way
switch be installed at the upper landing to control the stair way
lighting between the 1st and 2nd floors? - correct answer- a
townhome
A 175- amp breaker protects a feeder that originates in a
277/480-volt, 3-ph, 4 wire service panel in an office building.
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Which of the following conductors is the smallest size permitted
for the feeder ? - correct answer- 2/0
A 200-amp breaker protects a feeder that originates in a
120/240 volt, 3 ph, 4 wire service panel in a movie theatre.
Which of the following THHN/THWN conductors is the smallest
size permitted for the feeder ? - correct answer- 3/0
The maximum number of 3-pole circuit breakers used as
service disconnects permitted in a 3 phase panelboard is
______. - correct answer- 6
Which of the following are characteristics of THHN/THWN
insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant - correct answer- all of these
For the purpose of determining the number of current-carrying
conductors in a cable or conduit, the neutral _____ counted
when the branch circuit is 120/240-volt, 1 phase, 3 wire
connected to a 120/240-volt, 3 phase delta, 4 wire panelboard.
IEC YEAR 2 FINAL EXAM QUESTIONS
AND ANSWERS 2025
Anex _____ in the NEC contains examples of load calculations
for dwellings. - correct answer- D
Which of the installations listed below would be a wet location?
-a receptacle installed on the exterior wall of a building
- a run of PVC conduit installed on a fishing pier
-a luminaire installed on a parking lot pole - correct answer- all
of these
Which of the following is an example of a bare conductor?
- a 12 awg THHN copper wire
- the bare ground wire contained within romex (NM cable)
sheathing
-the bare aluminum wire twisted with triplex - correct answer-
the bare aluminum wire twisted with triplex
Which of the following statements is TRUE for an individual (or
dedicated) branch circuit that is run in a conduit with other
circuits? - correct answer- it can share a neutral with another
circuit
,2 | Page
Equipment designed to open circuits under ____ shall have an
interrupting rating not less than the nominal circuit voltage and
the current that is available at the line side of the equipment.
- short circuit
-overload
-ground fault - correct answer- all of these
The NEC permits the insulation for an ungrounded conductor to
be _____ in color.
- orange
-black
-brown
-yellow - correct answer- any of these
Which of the following locations requires that a three-way
switch be installed at the lower landing and another three-way
switch be installed at the upper landing to control the stair way
lighting between the 1st and 2nd floors? - correct answer- a
townhome
A 175- amp breaker protects a feeder that originates in a
277/480-volt, 3-ph, 4 wire service panel in an office building.
, 3 | Page
Which of the following conductors is the smallest size permitted
for the feeder ? - correct answer- 2/0
A 200-amp breaker protects a feeder that originates in a
120/240 volt, 3 ph, 4 wire service panel in a movie theatre.
Which of the following THHN/THWN conductors is the smallest
size permitted for the feeder ? - correct answer- 3/0
The maximum number of 3-pole circuit breakers used as
service disconnects permitted in a 3 phase panelboard is
______. - correct answer- 6
Which of the following are characteristics of THHN/THWN
insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant - correct answer- all of these
For the purpose of determining the number of current-carrying
conductors in a cable or conduit, the neutral _____ counted
when the branch circuit is 120/240-volt, 1 phase, 3 wire
connected to a 120/240-volt, 3 phase delta, 4 wire panelboard.
