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Residential Wiring 1 Final Exam with complete solutions
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Residential Wiring 1 Final Exam withcomplete solutions
For a given conductor size, which material has the greatest ampacity? - Answer -copper
only
Conductor sizes up through 4/0 AWG are expressed in American Wire Gauge (AWG).
Conductor sizes larger than 4/0 AWG are expressed in ____. - Answer -kcmil
The ampacity of the conductors in nonmetallic-sheathed cable is based on that of ____
conductors. - Answer -60°C (140°F)
How is track lighting load in residences calculated? - Answer -It is considered to be part
of the general lighting load of 3 volt-amperes per square foot.
In which location(s) is Type NM cable NOT allowed to be run? - Answer -Both damp
and moist locations and when concealed in dry locations.
The NEC defines a ____ as "the circuit conductors between the final overcurrent device
protecting the circuit and the outlet(s)." - Answer -branch circuit
Which of the following is NOT included when calculating the usable area of a dwelling to
compute the required lighting load? - Answer -crawl space
Where noncombustible surface material is used on walls or ceilings, outlet boxes must
be mounted so that they will be set back not more than ____ from the face of the
surface material. - Answer -1/4 in. (6 mm)
Continuous loads are not permitted to exceed ____ of the rating of the branch circuit. -
Answer -80 %
The National Electrical Code requires outdoor receptacles to be ____. - Answer -GFCI
protected
In the international system of units, the prefix milli- means ____. - Answer -one
thousandth
,Connectors marked ____ are suitable for use with aluminum, copper, or copper-clad
conductors. - Answer -AL/CU only
The rating of a branch circuit is determined by its ____. - Answer -overcurrent protective
device (fuse or circuit-breaker)
A device's primary function is to ____. - Answer -control electric energy
Liquidtight flexible nonmetallic conduit is subject to which of the following limitations? -
Answer -Both of these choices are limitations.
Under certain circumstances, the grounded (neutral) conductors of a residential service
____ permitted to be sized smaller than the phase conductors. - Answer -are
Device faceplates must be mounted so as to ____. - Answer -cover the opening in the
wall and to seat against the wall surface
Type AC cable is manufactured with ____ conductors. - Answer -all of these types of
The general lighting load for a dwelling is based on the ____. - Answer -square footage
of the dwelling
Type ____ is the most common building wire used today. - Answer -THHN/THWN
Wall receptacles must be placed so that no point measured horizontally along the floor
line in any wall space is more than ____ feet from a receptacle outlet. - Answer -6
For safety, it is very important that electrical equipment be "listed" by the ____. - Answer
-NRTL
Branch circuit conductors must have an ampacity ____ the maximum to be served. -
Answer -not less than
The term approved means to be ____. - Answer -acceptable to the authority having
jurisdiction.
In construction of one- and two-family dwellings, the electrical circuits are usually
designed by the ____. - Answer -electrician
Most public service commissions require that the voltage for residential services be held
to ± ____ percent of the nominal voltage as measured at the service point. - Answer -5
Which piece of electrical equipment is NOT considered a device? - Answer -lamp
, A receptacle outlet is a(n) ____. - Answer -outlet where one or more receptacles are
installed
What determines the rating of a branch circuit? - Answer -Rating of the overcurrent
device
An arc flash can produce temperatures of ____°F. - Answer -35,000
The total rating of utilization equipment fastened in place, other than luminaires, is not
permitted to exceed ____ of the branch-circuit rating if the branch circuit also supplies
lighting, other cord-and-plug-connected equipment, or both types of loads. - Answer -50
%
According to ____, unused knockouts and other openings in electrical boxes and
cabinets are required to be closed. - Answer -NEC 110.12(A)
Footwear suitable for electrical work is marked with the letters ____ - Answer -EH
The minimum lighting load requirement for dwellings is ____ volt-amperes per square
foot. - Answer -3
Low voltage (high voltage drop) in a home can be caused by ____. - Answer -All of
these choices
Electrical wall boxes should not be mounted back-to-back in walls because ____. -
Answer -All of these choice
The NEC in Table 210.24 shows that the minimum conductor size for branch-circuit
wiring is ____. - Answer -14 AWG
A dual-rated conductor marked THHN/THWN is rated ____ when used in dry locations.
- Answer -90°C (194°F)
In the international system of units, the prefix kilo- means ____. - Answer -thousand
When a 4 ft. piece of nonmetallic-sheathed cable is used as a fixture whip above an
accessible ceiling, it ____. - Answer -is not required to be secured
As defined in Article 100, a dwelling unit has the following feature(s): ____. - Answer -
permanent provisions for living, sleeping, cooking, and sanitation
For continuous loads, the branch-circuit rating, the conductors, and the overcurrent
device are required to be not less than ____ of the rating of the equipment. - Answer -
125 %
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