Second Year IEC Final
Second Year IEC Final Exam Questions
and Answers 2024
Anex _____ in the NEC contains examples of load calculations for dwellings. -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 -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 -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? -answer- ✔it can share a neutral with another
circuit
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 -answer- ✔all of these
The NEC permits the insulation for an ungrounded conductor to be _____ in color.
- orange
-black
-brown
-yellow -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? -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. Which of the following conductors is the smallest size
permitted for the feeder ? -answer- ✔2/0
Second Year IEC Final
, Second Year IEC Final
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 ? -answer- ✔3/0
The maximum number of 3-pole circuit breakers used as service disconnects permitted
in a 3 phase panelboard is ______. -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 -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. Each of the two
circuits carries 16 amps and serves resistive (linear) loads. -answer- ✔is not
Where a 120/240 volt, 1 phase, 3 wire multiwire branch circuit is connected to a "split-
wired" duplex receptacle in a barber shop, the branch-circuit OCPD/disconnect is
permitted to be ______
i. two single-pole circuit breakers without handle ties
ii. two single-pole circuit breakers with identified handle ties
iii. a 2-pole circuit breaker -answer- ✔ii or iii only
Which of the following is a type of circuit condition?
i.short circuit
ii. overload -answer- ✔i and ii
A 20-amp multiwire branch circuit is connected to breakers 1 and 3 in a 120/208 volt 3
phase 4 wire panelboard. _____ if the "hot" from breaker 3 and the neutral are
connected to a 2000-watt lighting fixture load. -answer- ✔The load will operate normally
and the breaker will not trip
When ____ touch together this is a short circuit.
-i. two ungrounded circuit conductors
- ii.an ungrounded and a grounded circuit conductor
- iii. an ungrounded circuit conductor and the metal conduit. -answer- ✔i or ii only
You are going to pull in three dedicated (individual) branch circuits into one conduit.
Each circuit supplies power to a 120-volt load. The ungrounded conductors will be
connected to breakers 2,4 and 6 in a 120/240 volt single phase 3- wire panel board. Per
the NEC, the fewest number of neutral conductors you can install for the branch circuit
is _______. -answer- ✔2
Second Year IEC Final
Second Year IEC Final Exam Questions
and Answers 2024
Anex _____ in the NEC contains examples of load calculations for dwellings. -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 -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 -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? -answer- ✔it can share a neutral with another
circuit
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 -answer- ✔all of these
The NEC permits the insulation for an ungrounded conductor to be _____ in color.
- orange
-black
-brown
-yellow -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? -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. Which of the following conductors is the smallest size
permitted for the feeder ? -answer- ✔2/0
Second Year IEC Final
, Second Year IEC Final
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 ? -answer- ✔3/0
The maximum number of 3-pole circuit breakers used as service disconnects permitted
in a 3 phase panelboard is ______. -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 -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. Each of the two
circuits carries 16 amps and serves resistive (linear) loads. -answer- ✔is not
Where a 120/240 volt, 1 phase, 3 wire multiwire branch circuit is connected to a "split-
wired" duplex receptacle in a barber shop, the branch-circuit OCPD/disconnect is
permitted to be ______
i. two single-pole circuit breakers without handle ties
ii. two single-pole circuit breakers with identified handle ties
iii. a 2-pole circuit breaker -answer- ✔ii or iii only
Which of the following is a type of circuit condition?
i.short circuit
ii. overload -answer- ✔i and ii
A 20-amp multiwire branch circuit is connected to breakers 1 and 3 in a 120/208 volt 3
phase 4 wire panelboard. _____ if the "hot" from breaker 3 and the neutral are
connected to a 2000-watt lighting fixture load. -answer- ✔The load will operate normally
and the breaker will not trip
When ____ touch together this is a short circuit.
-i. two ungrounded circuit conductors
- ii.an ungrounded and a grounded circuit conductor
- iii. an ungrounded circuit conductor and the metal conduit. -answer- ✔i or ii only
You are going to pull in three dedicated (individual) branch circuits into one conduit.
Each circuit supplies power to a 120-volt load. The ungrounded conductors will be
connected to breakers 2,4 and 6 in a 120/240 volt single phase 3- wire panel board. Per
the NEC, the fewest number of neutral conductors you can install for the branch circuit
is _______. -answer- ✔2
Second Year IEC Final
