Exam (elaborations)
IEC Year 2 Chapters 214 & 215 Questions and Answers 2024
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IEC Year 2 Chapters 214 & 215
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IEC Year 2 Chapters 214 & 215According to the NEC®, the smallest size permitted for branch circuit conductors
suitable for supplying other than cooking appliances is ___ AWG - answer14
Which of the following are permitted to be buried in a trench underground? The wiring
will be covered with stabilized sand to prevent physical damage. - answer Type MI
Cable
Conductor sizes are given in ___or ___. – answer AWG, Circular Mills
Conductors with thermoplastic and fibrous outer braid Type TBS insulation are used for
wiring ___. - answer Switchboards Only
Dual-rated THHN/THWN conductors have an insulation that permits installation in ___
locations. - answerDry, damp, wet 310.4 (A)
XHHW 500 kcmil conductors have an insulation that is ___ mm thick. - answer1.65,
310.4 (A)
The maximum temperature rating of a THHN conductor is ___°F in a dry location. -
answer194, 310.4 (A)
In a 480/277-volt, 3Ø, 4-W panel, a wire connected to breaker 41 is permitted by the
NEC® to be ___ in color. A 42-circuit panelboard is shown above. (Question 7 on
214.2) - answerYellow, Blue, Orange
Which of conductor insulation is oil resistant? - answerMTW
The minimum size conductor permitted in commercial buildings for branch circuits up to
and including 2000 volts is ___ AWG. - answer14
Type THW insulation has a ___ degree C rating for use in wiring through fixtures. -
answer90
What is the insulation temperature rating of type THWN wire in a wet location? -
answer75 C
Suffixes that designate the number of conductors within a cable include ___.
I. D - two insulated conductors laid parallel
II. M - two or more insulated conductors twisted spirally
, III. T - two or more insulated conductors twisted in parallel - answerI and II only, 310.8
(C)
Under certain conditions, the uninsulated conductor in nonmetallic-sheathed cable ___
permitted to be used as a current-carrying conductor ("hot" or neutral). Note: NM cable
is not permitted to be used as service-entrance cable. - answeris not
The ampacity of conductors is derated when the ambient temperature exceeds ___ºF. -
answer86, T310.16
What is the smallest conductor permitted to be connected in parallel - answer1/0 AWG,
310.10 (G) (1)
Which of the following about the equipment grounding conductor is true?
I. It does not count as a current-carrying conductor.
II. A bare, covered or insulated conductor shall be permitted.
III. For conduit fill, each grounding conductor counts as one conductor. - answerI, II, and
III 310.15 (F)
The parallel conductors in each phase or neutral shall ___.
I. have the same insulation type and conductor material
II. be the same size in cma
III. be the same length and be terminated in the same manner - answerI, II, and III
310.10 (G) (2)
When balancing a 3-wire circuit, from a single-phase 230/115-volt system, the neutral
conductor ___. - answershould carry the unbalanced current in each ungrounded
conductor 310.15 (E) (1)
For a raceway containing 30 current carrying conductors, the ampacity of each
conductor shall be reduced to ___ percent of that for a single conductor. - answer45,
310.15 (C) (1)
A 175-Amp breaker protects a feeder that originates in a 120/240-volt, 1-ph, 3-wire
service panel in a residence. Which of the following conductors is the smallest size
permitted for the feeder? - answer1/0, T310.16
Which of the following THHN/THWN copper conductors is the smallest size permitted
for a feeder where a 150 A breaker protects the feeder? The feeder originates in the
120/240-volt, 1-ph, 3-wire service panel in a bakery. - answer1/0, T310.16
When several AC, MC, or NMC cables are installed next to each other in a bundle, the
conductors in the cables are able to carry ___ current than if the cables were separated.
- answerless
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