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SECOND YEAR IEC FINAL COMPLETE
DETAILED CASE STUDY
Anex _____ in the NEC contains examples of load calculations for dwellings. - 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 - 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 - 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? - 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 - all of these
The NEC permits the insulation for an ungrounded conductor to be _____ in color.
- orange
-black
, -brown
-yellow - 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? - 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 ? - 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 ? - 3/0
The maximum number of 3-pole circuit breakers used as service disconnects permitted in a 3 phase
panelboard is ______. - 6
Which of the following are characteristics of THHN/THWN insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant - 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. - 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
SECOND YEAR IEC FINAL COMPLETE
DETAILED CASE STUDY
Anex _____ in the NEC contains examples of load calculations for dwellings. - 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 - 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 - 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? - 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 - all of these
The NEC permits the insulation for an ungrounded conductor to be _____ in color.
- orange
-black
, -brown
-yellow - 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? - 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 ? - 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 ? - 3/0
The maximum number of 3-pole circuit breakers used as service disconnects permitted in a 3 phase
panelboard is ______. - 6
Which of the following are characteristics of THHN/THWN insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant - 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. - 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
