Construction wiring test 2
A 4-way switch does not have "ON" and "OFF" markings. Four-way switches are connected to the __________ between two 3-way switches. One 3-way switch is fed by the _________: the other 3-way switch is connected to the load.
travelers, source
The smallest wire size for which overcurrent protection is specified in the Code is
14 AWG
Nonmetallic-sheathed cable is manufactured with copper conductors ranging in size from ________ AWG to _______ AWG and with aluminum or copper-clad aluminum conductors ranging in size _______ AWG to ________ AWG.
14 to 2, 12 to 2
Alternating current, general-use snap switches are UL-listed to control motors rated up to _____ horsepower.
2
When fire stopping material is used where more than ______ nonmetallic sheathed cables pass through wood framing members, their ampacities must be adjusted, according to 310.15(B)(3)(a)
2
The total rating of utilization equipment fastened in place, other than luminaires (lighting fixtures), shall not exceed ____ percent of the branch-circuit ampere rating, where lighting units, cord and plug connected utilization equipment not fastened in place, or both, are also supplied
50
Lengths of flexible metal conduit longer than _______ feet are not acceptable as an equipment grounding conductor. In such cases a separate bonding jumper is required to run outside of the flexible conduit to maintain the continuity of the grounding path.
6
A dual-rated conductor marked THHN/THWN is rated _______ when used in dry locations
90 C(194 F)
The suffix "B" in Type NM-B nonmetallic cable means that the conductors have an insulation temperature rated _______
90 C(194 F)
Connectors marked _____are suitable for use with aluminum, copper, or copper-clad conductors. Connectors not so marked are for use with copper conductors only.
AL/CU
GFCI protection is not required for ____.
a built in dishwasher
The NEC specifies that 60C ampacity be used for circuits rated 100 amperes or less, except when the equipment terminals are marked for use with higher temperature wire. What is one potential problem with using higher-temperature, higher ampacity wire?
a higher temperature rating can equal smaller ampacity rating
To avoid inductive heating in metallic raceways, the NEC requires that ____.
all circuit conductors be run in the same raceway
Low voltage (high voltage drop) in a home can be caused by ________ a. a conductor that is to small for the load b. a circuit that is too long c. poor connections at the terminals d. all of these
all of these
The grounded (identified) conductor of 6 AWG or smaller must have an outer finish that is _______ a.white b.gray c.three continuous white stripes d.any of the above
any of the above
Under certain circumstances, the grounded (neutral) conductors of a residential service _______ permitted to be sized smaller than the phase conductors.
are
Phase conductors 6 AWG and smaller ____ permitted to be re-identified as equipment ground conductors using green paint, tape, or other effective means.
are not
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. both of these
both of these
GFCI protection is for which of the following? a. outdoor receptacles installed at eaves for snow melting equipment b.a kitchen receptacle installed inside a cabinet to supply a microwave oven c. a receptacle installed within 6 feet of a wet-bar sink d. a receptacle installed for a kitchen clock
c. a receptacle installed within 6 feet of a wet-bar sink
For given conductor size, which material has the greatest ampacity?
copper
Table 310.15(B)(2)(a) gives allowable ampacities of copper conductors with various types of insulation. When conductors will be used in ambient temperatures exceeding 30 C(86 F), the ______ for the table must be applied.
correction factors
Type NM cable can be run in all of the following locations, except for
damp and moist locations and exterior masonry block or tile walls
A single receptacle for one appliance or a duplex receptacle for two appliances that are located within dedicated space for each appliance that in normal use is not easily moved from one place to another and that is cord-and-plug connected _________ require tamper-resistant receptacles.
do
Explain what flexible metallic and nonetallic conduits are typically used for in residential construction.
easier installation
When using individual conductors in raceway, all of the following colors of insulation are permitted for the grounded conductor (neutral), except for _______
green with three white strips
When type NM cable is run through holes in metal framing members, _________ must be provided to protect the cable from sharp metal edges
grommet
The long slot on a 15-ampere, 125-volt, receptacle is the _______ conductor
grounded
"T"-rated snap switches are intended for what application?
incandescent lighting (switches for lighting purposes)
Type AC cable is manufactured with ________ phase conductors.
two three and four
NEC 406.3(D)(3) permits existing two-wire, nongrounded-type receptacles to be placed with a ________ where no equipment grounding conductor exists.
two-wire nongrounding-type receptacle
If the 1-1/4 in. (32mm) distance from the edge of the black hole to the edge of the framing member cannot be maintained, what thickness of steel plate must be used to protect the cable?
1/16 inch (1.6mm)
The NEC recommends voltage drop no greater than _______ perent for feeders and no greater than _______ percent total for feeders and branch circuits together.
3 & 5
A GFCI for personal protection operates when it senses a current imbalance between _______ mA and _________ mA
4 & 6
Class A GFCI devices trip (open) when a ground-fault in the range of ______ milliamperes occurs.
4 to 6
The ampacity of Type NM cable shall be in accordance with ____ conductor temperature rating
60 C (140 F)
When an existing two-wire, nongrounding-type receptacle is replaced in a location where the code requires a GFCI receptacle, it is permitted to be replaced by a ______
GFCI receptacle
What would happen if fire and smoke alarms were connected to a circuit that is protected by a GFCI breaker?
Nuisance tripping
Although the National Electric Code contains requirements for making holes and notches in framing members, in order to protect the cables installed in them, electricians must also be aware that _________ also have requirements for holes and notches in framing members, in order to not weaken the structure of the building.
building codes
On isolated ground receptacles, the metal yoke _____ integrally bonded to the equipment grounding terminal of the receptacle.
is not
When a 4 ft. piece of nonmetallic-sheathed cable is used as a fixture whip above an accessible ceiling, it ________
is not required to be secured
Conductor sizes up through 4/0 AWG are expressed in American Wire Gauge (AWG). Conductor sizes larger than 4/0 AWG are expressed in
kcmil
Older electrical books and plans sometimes use the term "MCM", which means the same thing as ______
kcmil
AFCI protection is required for all outlets in
living rooms
Snap switches with nonmetallic yokes (straps) have a terminal for the equipment grounding conductor. Using this type of switch provides a means for grounding _______ faceplates when nonmetallic boxes are used.
metal
Branch circuit conductors shall have an ampacity ______ the maximum to be served.
not less than
The rating of a branch circuit is determined by its ____.
overcurrent protective device (fuse or circuit breaker)
Explain why particular care has to be taken when making aluminum wiring connections.
put a oxidizing agent on the wire itself, makes connections a lot better
When receptacle 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.
removed
When a conductor that is carrying current breaks or when a loose connection occurs, it is a _________ arcing fault because the current is trying to travel in its intended path
series
When terminating a receptacle, the white (grounded) conductor is always connected to the _________-colored terminal, and the phase (hot) conductor is always connected to the ________-colored terminal
silver, gold
Name at least four kinds of light switches
single-pole, three way, four way, dimmer switch
The common point on a wye-connected polyphase system or the mid-point on a single-phase system is the __________
star or neutral point
The NEC requires that conductors 8 AWG and larger must be _______ when installed
stranded
The National Electrical Code allows rigid PVC conduit to do all of the following except for ________
support lighting fixtures
The conductors that run between a switched outlet and the switch controlling the outlet are called a(n)
switch loop
All 125-volt, 15- and 20-ampere receptacles installed to serve a kitchen countertop are required to be ____.
tamper resistant