Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The meaning of approved is ____.
a. | listed by a Nationally Recognized Testing Laboratory (NRTL) | b. | acceptable to the
National Electrical Code® | c. | acceptable to the architect or engineer
designing the job | d. | acceptable to the authority having
jurisdiction |
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2.
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In the international system of units, the prefix milli- means
____.
a. | one hundredth | b. | one thousandth | c. | one
millionth | d. | one billionth |
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3.
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Nationally Recognized Testing Laboratories (NRTL) ____ electrical products to
provide a basis for approval by inspectors in the field.
a. | approve | b. | test and list | c. | rate | d. | none of these |
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4.
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Branch-circuit conductors at outlet boxes are required to have at least ____
inches of free length for making splices and connections. The length of conductor is measured is from
where the conductors enter the box.
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5.
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NEC® 300.15 requires that a ____ be installed at each conductor splice or
connection point.
a. | insulated wire connector | b. | outlet box | c. | grounding electrode
conductor | d. | none of these |
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6.
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Ceiling-suspended (paddle) fans are required to be installed on ____.
a. | metallic boxes only | b. | boxes listed for supporting fixtures weighing
fifty pounds or more | c. | boxes marked "acceptable for fan
support" | d. | boxes secured directly to a ceiling joist or other structural
element |
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7.
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According to the NEC®, unless “listed” for the purpose,
electrical wall boxes shall not be mounted back-to-back in walls because ____.
a. | sound may be transmitted from room to room. | b. | it reduces the fire
resistance of the wall. | c. | there is not sufficient room in the wall cavity
to mount electrical wall boxes back-to-back. | d. | all of these. |
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8.
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According to ____, unused knockouts and other openings in electrical boxes and
cabinets are required to be closed.
a. | Article 250 | b. | NEC® 110.12(A) | c. | NEC® 314.17
(D), Fine Print Note | d. | both b and c |
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9.
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NEC® 210.52 on receptacles in residences deals with ____.
a. | the "6-foot rule" | b. | GFCI protection of outdoor
receptacles | c. | mounting height | d. | ganged
receptacles |
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10.
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In construction of one- and two-family dwellings, the electrical circuits are
usually designed by the ____.
a. | electrician | b. | architect | c. | consulting
engineer |
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11.
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A 20-ampere branch circuit requires ____ conductors, ignoring the effects of
voltage drop.
a. | 14 AWG copper | b. | 14 AWG aluminum | c. | 12 AWG
copper | d. | 12 AWG aluminum |
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12.
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Where fixed glass panels (i.e., windows or non-sliding parts of door) do not
permit installation of wall-mounted receptacles, ____ are typically used to satisfy the receptacle
spacing requirements of NEC® 210.52(A)(1).
a. | extension cords | b. | floor-mounted receptacles | c. | quad
receptacles | d. | outdoor GFCI-protected receptacles |
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13.
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Is a receptacle required on a 3 ft (900 mm) wall space behind a door that is
normally left open?
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14.
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Small appliance receptacle outlets ____ required to be included in the 3
volt-ampere per square foot load calculation.
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15.
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Wire sizes up through No. 4/0 are expressed in American Wire Gauge (AWG).
Wire sizes larger than 4/0 AWG are expressed in ____.
a. | metric units | b. | kcmil | c. | diameter | d. | radians |
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16.
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Section 310.3 requires that conductors 8 AWG and larger must be ____ when
installed in a raceway.
a. | grounded | b. | bonded | c. | stranded | d. | none of these |
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17.
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Multiple receptacles connected to a 20-ampere branch circuit are required to be
rated ____.
a. | 15 amperes | b. | 20 amperes | c. | 125
volts | d. | either a or b |
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18.
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Older electrical books and plans sometimes use the term "MCM," which
means the same thing as ____.
a. | metric | b. | kcmil | c. | A.I.C. | d. | GFCI |
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19.
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Connectors marked ____ are suitable for use with aluminum, copper, or
copper-clad conductors. Connectors not so marked are for use with copper conductors
only.
a. | CO-ALR | b. | AL/CU | c. | UL
9 | d. | both a and b |
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20.
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Under certain circumstances, the grounded conductors of a residential service
____ permitted to be sized smaller than the phase conductors.
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21.
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Closed-loop and programmed power systems for residences are covered in
Article ____.
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22.
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Type NM cable can be run in all the following locations, except for
____.
a. | concealed in dry locations | b. | concealed in damp and moist
locations | c. | exterior masonry block or tile walls | d. | both b and c |
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23.
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When nonmetallic-sheathed cable is used as a fixture whip above an accessible
ceiling, it ____.
a. | is not required to be secured | b. | may be up to 6 ft (1.8 m) in
length | c. | is required to be plenum-rated | d. | all of these |
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24.
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Armored cable includes a(n) ____ to insure a low-impedance grounding
path.
a. | insulated equipment grounding conductor (green ground) | b. | bare equipment
grounding conductor | c. | internal bonding strip | d. | interlocking
armor |
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25.
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Type AC cable is manufactured with ____ phase conductors.
a. | two | b. | three | c. | four | d. | all of these |
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26.
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Residential wiring must be installed in raceways under which of the following
condition(s)?
a. | cement of cinder block construction | b. | poured concrete
construction | c. | where required by local electrical codes | d. | all of
these |
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27.
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As covered by Article 352, rigid nonmetallic conduit is permitted to do
all of the following, except for ____.
a. | be installed concealed | b. | support lighting fixtures | c. | support conduit
bodies | d. | be used in damp and wet locations |
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28.
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Liquidtight flexible nonmetallic conduit is subject to which of the following
limitations?
a. | cannot be used in direct sunlight, unless marked for this
application | b. | can become brittle in extremely cold temperatures | c. | cannot be
direct-buried, except when marked for this application | d. | all of these |
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29.
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When using individual conductors smaller than 6 AWG in a raceway, which of the
following colors of insulation are not permitted for the grounded conductor (neutral),
____.
a. | green with yellow stripe | b. | white | c. | green with three
white stripes | d. | gray |
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30.
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When using conduit wiring methods, which of the following colors of insulation
or marking are permitted to identify "hot" phase conductors?
a. | black, red, and blue for 120/208-volt systems | b. | yellow, orange, and
brown for 277/480-volt systems | c. | any colors except white, gray, or
green | d. | all of these |
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31.
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Wiring devices for use on nominal 120-volt circuits are marked ____.
a. | 110 volts | b. | 115 volts | c. | 120
volts | d. | 125 volts |
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32.
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Alternating current, general-use snap switches are UL-listed to control motors
rated up to ____ horsepower.
a. | 1/2 | b. | 3/4 | c. | 2 | d. | as marked on the
switch |
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33.
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NEC® 404.2(A) requires that switching be done only in the ____
conductor.
a. | ungrounded | b. | designated | c. | black | d. | red |
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34.
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When receptacles or switches have No. 6-32 screws secured to them with small
pieces of cardboard, these pieces of cardboard must be ____ when the wiring device is installed in a
metal outlet box.
a. | left in place | b. | removed | c. | replaced with metal
lock washers | d. | none of these |
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35.
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To avoid inductive heating in metallic raceways, NEC® 300.20
requires that ____.
a. | all circuit conductors be run in the same raceway | b. | the grounded
(neutral) conductor be oversized | c. | the equipment grounding conductor be bonded to
the raceway | d. | none of these |
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36.
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Which of the following underground feeder installations to a remote building
"meets Code"?
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37.
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NEC® 406.3(D)(3) permits existing two-wire, nongrounded-type
receptacles to be replaced with a ____ where no equipment grounding conductor exists.
a. | GFCI receptacle…and marked “No Equipment Ground”. | b. | two-wire
nongrounding-type receptacle. | c. | three-wire grounding-type receptacle if fed
from an upstream GFCI…and marked “GFCI Protected” and “No Equipment
Ground.” | d. | all of these. |
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38.
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Fixture whips used with fixtures in suspended ceilings are permitted to be of
various types of cables or conductors in flexible raceways. Regardless of the wiring method
used, fixture whips are permitted to be a maximum of ____ long between outlet box and fixture.
a. | 3 feet (900 mm) | b. | 4 1/2 feet (1.4 m) | c. | 6 feet (1.8
m) | d. | 6 feet 7 inches (2 m) |
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39.
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Leaving lamps on for long periods of time ____ lamp life.
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40.
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Residential wiring plans generally show lighting and receptacle outlet locations
but not circuits. The electrician should design the installation with which of the following in mind:
____.
a. | economy - minimizing the number and length of circuits | b. | convenience for the
homeowner or other user | c. | National Electrical Code®
requirements | d. | all of these |
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41.
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Which of the following switch types is rarely used in residential wiring?
a. | single-pole | b. | double-pole | c. | three-way | d. | four-way |
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42.
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A rotary light dimmer ____ suitable for use as a ceiling-suspended (paddle)fan
speed control.
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43.
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Ceiling-suspended (paddle) fans must be specially supported for all of the
following reasons, except for ____.
a. | weight | b. | torque (twisting motion, particularly when
first starting) | c. | safe grounding | d. | vibration |
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44.
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Ceiling-suspended (paddle) fans weighing more than ____ pounds are required to
be supported independently of the outlet box.
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45.
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Ceiling-suspended (paddle) fan speed can be controlled by ____.
a. | pull chain on the fan | b. | speed control mounted in a wall
box | c. | remote-control similar to TV/VCR type | d. | any of these |
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46.
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NEC® 210.12 requires that ____ protection be provided for all
electrical outlets in residential bedrooms.
a. | ground-fault circuit interrupter (GFCI) | b. | arc-fault circuit
interrupter (AFCI) | c. | both a and b |
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47.
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Branch circuits are rated according to their ____.
a. | overcurrent protective device rating | b. | conductor size | c. | length | d. | impedance |
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48.
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Cord-connected luminaires (fixtures), hanging luminaires (fixtures), track
lighting, or ceilings-suspended (paddle) fans ____ permitted to be installed within the "tub
zone" extending 3 feet (900 mm) horizontally and 8 feet (2.5 m) vertically from the top of the
tub rim.
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49.
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Which of he following kitchen equipment is permitted to be connected to the two
20-ampere small-appliance circuits required for the kitchen and dining room area?
a. | lighting | b. | fan | c. | clock
outlet | d. | none of these |
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50.
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Split-wiring of receptacles in kitchens and other locations where high-load
appliances are used is not always practical when ____.
a. | decorator-type receptacles are used | b. | GFCI receptacles are used | c. | Type NM cable is
used | d. | plastic boxes are used |
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51.
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Duplex receptacles connected to a 20-ampere, small-appliance branch circuit in
kitchens and dining rooms ____.
a. | may be rated 15 amperes | b. | may be rated 15- or
20-amperes | c. | may be rated 20 amperes | d. | all of the
above |
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52.
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The load for each small-appliance, branch circuit load is required to be
calculated at ____.
a. | 1,440 watts | b. | 1,500 volt-amperes | c. | 1,920
watts | d. | 2,400 volt-amperes |
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53.
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The 125-volt, 20-ampere receptacles installed to serve kitchen countertops are
required to have GFCI protection ____.
a. | when they are within 6 feet (1.8 m)of the sink | b. | under all
circumstances | c. | unless provided with assured grounding conductor protection | d. | none of
these |
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54.
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An electric circuit consists of the ____.
a. | power source | b. | conductors | c. | load | d. | all of the
above |
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55.
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Track lighting is not permitted to be installed less than ____ above the floor
unless it has an open-circuit voltage of less that 30 volts RMS.
a. | 5 feet (1.5 m) | b. | 6 feet (1.8 m) | c. | 6 feet 7 inches (2.0
m) | d. | 7.5 feet (2.3 m) |
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56.
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Which of the following is required in order to dim fluorescent fixtures?
a. | fluorescent dimmer | b. | dimming ballasts | c. | oversized neutral in
the branch-circuit | d. | both a and b |
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57.
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When laying out the wall receptacle locations in a bedroom, make sure that a
receptacle is installed so that no point along the floor line is more than ____ from a
receptacle.
a. | 6 feet (1.8m) | b. | 9 feet (2.7m) | c. | 12 feet
(3.7m) |
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58.
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When an existing dryer or electric range is replaced, NEC®
250.140 ____ the grounded conductor of an existing individual branch circuit to be used for
grounding the appliance frame.
a. | permits | b. | does not permit |
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59.
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Cord sets rated 40, 45, or 50 amperes are usually called ____ cords, and cord
sets rated 30 amperes are called ____ cords.
a. | SJT, SJ | b. | range, dryer | c. | heavy-duty, extra
heavy-duty | d. | washer, dryer |
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60.
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Household cooking device demand factors shown in Table 220.19 are
normally ____ than the appliance nameplate rating.
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61.
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A porcelain lampholder with a pull-chain ____ permitted to serve as the lighting
outlet required by NEC® 210.70(A)(3).
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62.
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To provide shock protection, low-voltage wiring systems are required by
Article 411 to be ____.
a. | double-insulated | b. | grounded | c. | supplied though
isolating transformers | d. | all of these |
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63.
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When a single receptacle of any rating is installed on an individual branch
circuit, the receptacle rating must not be ____ than the rating of the branch circuit.
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64.
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In unfinished basements, Type NM cable with conductors smaller than two 6 AWG or
three 8 AWG installed perpendicular to joists is required to be run ____.
a. | through holes bored in the joists | b. | on running boards | c. | behind nailing
strips | d. | both a and b |
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65.
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Metallic raceways and metallic cable installations ____ generally considered to
be adequate equipment grounding conductors.
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66.
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Switch and outlet boxes are available with all the following size knockouts,
except for ____.
a. | Trade size 3/8 | b. | Trade size 1/2 | c. | Trade size
3/4 | d. | Trade size 1 |
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67.
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A short length of EMT is run between two panels. The ampacity values for the
conductors in this EMT need not be derated as long as the length of the EMT does not exceed
____.
a. | 12 in., 300 | b. | 18 in., 450 | c. | 24 in.,
600 |
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68.
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Motor-circuit conductors are sized at 125% of the motor’s nameplate ampere
rating, in conformance to ____.
a. | Table 310-16 | b. | Table 310-19 | c. | NEC®
430-6(A)(1) and 430.22. | d. | Chapter 9, Table
8 |
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69.
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NEC® 430.6(A)(1) requires that the motor full-load amperes
listed in Tables 430.147 through 430.150 be used to size all of the following,
except for ____.
a. | circuit conductors | b. | overload protectors | c. | ground-fault
protection | d. | fuse size |
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70.
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NEC® 110.14(C) states that for circuits rated 100 amperes and
less, or for conductor sizes 14 AWG through 1 AWG, conductor ampacity shall be selected from the ____
column of Tables 310.16 through 310.19.
a. | 60°C | b. | 75°C | c. | 90°C | d. | depends on derating
factors |
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71.
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In general, motor-overload protection is required not to exceed ____ percent of
a motor's full-load current.
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72.
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NEC® ____ covers selection of time-delay fuses for motor
branch-circuit short-circuit and ground-fault protection.
a. | NEC® 430.32(A)(1) and NEC® 430.52(C)(1) | b. | Table 430.52 and
NEC® 430.32(A)(1) | c. | Table 430.52 and NEC®
430.52(C)(1) | d. | all of these |
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73.
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When direct-burial Type UF or USE cables are installed beneath sidewalks or
other paved areas in residential occupancies, they are required to be ____.
a. | installed in raceways | b. | connected to pole lighting standard grounding
lugs | c. | installed a minimum of 18 in. (450 mm) deep | d. | both a and
c |
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74.
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"Submersible pump cable" supplied with well pump assemblies ____
suitable for directly burial when marked Type USE or Type UF.
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75.
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Since the grounded (neutral) conductor is not permitted to be used for grounding
the frames of electric ranges, ovens, or cooktops in new installations, these appliances require ____
power cords.
a. | three-wire | b. | double-insulated | c. | four-wire | d. | Listed |
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76.
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The grounded conductor of a branch circuit is permitted to serve as the
equipment grounding conductor for a replacement range or cooktop when all the following conditions
are met, except for ____.
a. | the grounded conductor is not smaller than 10 AWG copper or 8 AWG
aluminum | b. | the individual branch circuit is existing | c. | the grounded
conductor is insulated, unless it is part of Type SE cable | d. | the branch circuit
uses listed wire connectors |
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77.
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Cord sets rated 30 amperes are usually called ____, and cord sets rated 40, 45,
or 50 amperes are called ____.
a. | SJT, SJ | b. | dryer, range | c. | heavy-duty, extra
heavy-duty | d. | washer, dryer |
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78.
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NEC® 422.60(A) requires that an appliance nameplate show
____.
a. | the appliance rating in volts and amperes | b. | the appliance
connected load in volts and watts | c. | the appliance branch circuit conductor
size | d. | either a or b |
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79.
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When an appliance is not marked with its maximum overcurrent protection, the
branch circuit protection device is sized according to ____.
a. | Table 220-19 | b. | the ampacity of the branch circuit conductors
supplying the appliance | c. | 30 amperes maximum | d. | none of
these |
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80.
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A "unit switch" used as a disconnecting means for an appliance shall
____.
a. | be horsepower-rated | b. | interrupt all ungrounded circuit
conductors | c. | have a NEMA 3R enclosure when installed outdoors | d. | both a and
b |
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81.
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On all types and ratings of receptacles, the grounding blade is ____ than the
others to insure that it makes its connection before the grounded conductors do and breaks its
connection after they do (first make-last break).
a. | larger | b. | more durable | c. | longer | d. | tarnish-resistant |
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82.
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Food-waste disposers include a small manual reset button to restart the motor if
it overheats and goes off-line due to prolonged use, or something falling into the unit and jamming
it. This manual reset provides the ____ protection required by Code for this type of
appliance.
a. | short-circuit | b. | ground-fault | c. | overload | d. | all of these |
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83.
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The two 20-ampere small-appliance branch circuits required for the kitchen and
dining room area are intended to supply ____ appliances.
a. | under 1/3 horsepower | b. | portable | c. | fixed-in-place | d. | all |
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84.
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Thermostats and humidistats used in residential occupancies come in ____
models.
a. | line-voltage | b. | low-voltage | c. | solid-state | d. | all of these |
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85.
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When a central air-conditioning unit label states "Maximum size time-delay
fuse 50 amperes," what type of circuit-breaker is permitted to provide running overload
protection?
a. | 50-ampere circuit-breaker | b. | 50-ampere HACR
circuit-breaker | c. | 65-ampere circuit-breaker | d. | circuit-breakers are not permitted for this
application |
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86.
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On circuits supplying cord-and-plug connected air conditioners, the branch
circuit overcurrent protective device rating is not permitted to exceed ____.
a. | the ampacity of the branch circuit conductors | b. | the rating of the
receptacle to which the air conditioner is connected | c. | 50 percent of the total load of the air
conditioner plus other loads on the same circuit | d. | either a or b, whichever is
greater |
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87.
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Residential thermostats should be located where they will not be influenced by
____.
a. | drafts or currents from air registers | b. | radiated heat from appliances, lamps,
etc. | c. | direct rays of the sun | d. | all of these |
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88.
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Motor-control circuit conductors must have overcurrent protection in accordance
with ____.
a. | NEC® 240-1 | b. | NEC® 430-72 | c. | NEC®
440-18(d) | d. | Article 725 |
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89.
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Internal control circuitry of motorized equipment, such as heating, ventilating,
and air-conditioning, is generally covered by ____.
a. | Article 430 | b. | Article 440 | c. | listing agency
standards such as Underwriters’ Laboratories | d. | none of these |
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90.
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External control circuitry of motorized equipment such as heating, ventilating,
and air-conditioning is generally covered by ____.
a. | Article 430 | b. | Article 440 | c. | Article
725 | d. | both a and c |
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91.
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Because they have internal overload protection, listed Class 2 and Class 3
transformers are permitted to be supplied by branch circuits having overcurrent protection not
exceeding ____ amperes.
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92.
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Class 2 and Class 3 power source voltage limitations, current limitations, and
overcurrent protection requirements are found in ____.
a. | Article 220 | b. | Article 240 | c. | Article
725 | d. | Chapter 9, Tables 11(A), 11(B) |
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93.
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It ____ permitted to install Class 2 wiring in the same raceway or enclosure as
electric light and power wiring.
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94.
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Signaling circuit is defined in ____.
a. | Article 100 | b. | NEC® 725.1 | c. | NEC®
725.10(C) | d. | NEC® 800.3(B)(2) |
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95.
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Which of the following types of conduit is (are) permitted to be used for
service masts?
a. | rigid nonmetallic conduit | b. | intermediate metal conduit | c. | rigid metal
conduit | d. | both b and c |
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96.
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A mast service is installed on a residence. The minimum clearance above the roof
for the service conductors is ____ provided the conductors pass over not more than 4 ft (1.2 m) of
the overhanging portion of the roof.
a. | 18 in. (450 mm) | b. | 24 in. (600 mm) | c. | 36 in. 900
mm) |
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97.
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GFCI protection for personnel ____ protect a person against the sensation of
feeling a shock.
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98.
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So-called "structured premises wiring systems" are defined in
standards published by ____.
a. | National Electrical Manufacturer's Association (NEMA) | b. | Underwriters
Laboratories Inc. (UL) | c. | Institute of Electrical and Electronics
Engineers (IEEE) | d. | Electronic Industries Association/Telecommunications Industry Association
(EIA/TIA) |
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99.
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You are installing individual cables from a central distribution panel to all
locations in your home where you plan on using computers, TV, cable modems, and similar electronic
equipment. In addition to installing 125-volt receptacles, which of the following cables should be
installed.
a. | Two 2-conductor bell wire cables | b. | At least one RG-6 (75-ohm) coaxial
cable | c. | At least one four-pair Category 5 or 5e cable | d. | Two 2-conductor
thermostat wire that has an outer jacket | e. | Both b and c |
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100.
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The conductors between a standby generator and the panel that serves the
critical loads shall be sized at not less than ____ percent of the generators nameplate current
rating.
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