Residential Wiring Review
GFCI protection is not required for _________.
a built in dishwasher
GFCI protection is required for which of the following?
a receptacle installed within 6 feet of a wet bar sink
to avoid inductive heating in metallic raceways, the NEC requires that _________.
all circuit conductors be run in the same raceway
a receptacle outlet is...
an outlet where one or more receptacles are installed
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
sliding glass panels ____________ considered to be wall space, the same as any other interior or exterior door.
are not
small appliance receptacle outlets __________ included in the 3 volt ampere per square foot load calculation.
are not
article 210 applies to branch circuits, but branch circuit calculations are covered in __________.
article 220
The "12 foot rule" for spacing receptacles applies to all the following ares of a house except for..
attics
All measurements in the national electrical code are shown in which system of units?
both inch pound and metric values
all of the following are types of fluorescant ballasts, except for _________.
capacitor boost
The selection of outlet boxes and switch boxes is made by the electrician. these decisions are based on code requirements, space allowances, good wiring practices, and ________.
common sense
For a 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 temperature exceeding 30 degrees C (86 degrees F), the ___________ for the table must be applied
correction factors
all of the following are included when calculating the usable are of a dwelling to compute the required lighting load, except for____________
crawl space
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 not
which of the following switch types is rarely used in residential wiring?
double-pole
during the winter. it is suggested that a paddle fan should ________________ .
draw air up
in construction of one and two family dwellings, the electrical circuits are usually designed by the....
electrician
leaving fluorescent lamps on for long periods of time ______ lamp life.
extends
to be effective, accent lighting should be at least ________ times that of the surrounding general lighting.
five
The NEC requires that a __________ be installed at each conductor splice connection point.
flexible conduit
where fixed glass panels windows or non sliding parts of doors do not permit installation of wall mounted receptacles, _____________ are typically used to satisfy the receptacle spacing requirements of the NEC
floor mounted receptacles
which of the following lamp types generally performs badly in low temps?
fluorescent
some ceiling fan/light units have one lamp socket, wheras other have _________ lamp sockets.
four or five
when using nonmetallic boxes, the equipment grounding conductor in nonmetallic sheathed cable is connected to the _______ -shaped equipment grounding screw found on all switches and receptacles.
green hexagon
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 stripes
The long slot on a 15 ampere 125volt, receptacle is the ________ conductor.
grounded
receptacles installed on 15 and 20 ampere branch circuits must be of the _______ type.
grounding
when making up cord connectors on a chain hung fixture, the conductor with the grooved or raised insulation is the ________ conductor.
identified
The NEC requires that a ____________ be installed at each conductor splice connection point.
insulated wire connector
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
how is track lighting load in residences calculated?
it is considered to be part of the general lighting load of 3 volt amperes per square foot
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
All of the following items of electrical equipment are devices, except for a....
lamp
when installing a ceiling fan , the outlet box must be _________________________________.
listed and marked as acceptable for fan support
AFCI protection is rquired for all outlets in __________ .
living rooms
fluorescant lamps are color rated in terms of degrees kelvin, which expresses temp. above absolute zero. the _______ the degrees kelvin, the ________ the color tone
lower, warmer
NEC article 210 provides __________ guidelines for locating receptacles outlets in residences.
mandatory
A raised plaster cover often called a plaster ring or mud ring is permitted to increase the maximmum number of conductors permitted in an outlet box when it is __________________________.
marked with its cubic inch volume
snap switches wiht nonmetallic yokes (straps) have a terminal for th equipment grounding conductor. using this type of switch provides a means for grounding ___________ faceplates when nonmetallic boxes are used.
metal
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?
national electrical code requirements
how many lighting outlets are permitted on one branch circuit?
no limit
branch circuit conductors shall have an ampacity _________ the maximum to be served
not less than
many electricians wire the lights and receptacles in a room on different circuits because this __________
offers the advantage that all power in a room will not go out if the over-current protective device trips
In the international system of units, the prefix milli- means?
one thousandth
The rating of a branch circuit is determined by its....
overcurrent protective device (fuse or circuit breaker)
as defined in article 100, a dwelling unit has the following feature
permanent provisions for living, sleeping, cooking, and sanitation
when receptacles or switches have no. 6-32 screws secured to them with small pieces of coardboard, these pieces of cardboard must be _________ when the wiring device is installed in a metal outlet box.
removed
ceiling fans must be specially supported for all of the following reasons, except for _____________.
safe grounding
a light dimmer ________________ be used as a speed control for a ceiling fan or other motor
should not
The NEC requires the conductors 8 AWG and larger must be _______ when installed in a raceway.
stranded
the national electric code allows rigid PVC conduit to do all of the following except for__________.
support lighting fixtures
all 125 volt 15 ampere receptacles in a dwelling are required to be ___________.
tamper resistant
a light above a workbench is an example of ________.
task lighting
Nationally recognized testing laboratories (NRTL) ___________ electrical products to provide a basis for approval by inspectors in the field
test and list
in the international system of units, the prefix kilo- means?
thousand
The purpose of electrical symbols on plans is
to graphically represent electrical products and systems
NEC 406.3(D)(3) permits existing two-wire, nongrounded type receptacles to be replaced with a _______ where no equipment grounding conductor exists.
two wire nongrounding type receptacle
recessed lighting fixtures constructed for installation in thermal insulation are rated as __________.
type IC
the NEC requires that switching be done only in _______ conductors.
ungrounded
The NEC allows what maximum number of receptacle outlets to be connected on a 120 volt residential lighting or small appliance branch circuit?
unlimited
Devices are equipment whose primary function is to carry current, not to
utilize electric energy
the maximum volt ampere loading permitted on a 20 ampere branch circuit with a continuous load is __________.
1,920 VA
fluorescant fixtures mounted on low density cellulose fiberboard must generally be mounted _______ the fiberboard surface.
1-1/2 in. (38mm) from
the "T" in fluorescent lamp ratings refers to the lamp diameter, in 1/8 inch increments. thus, a T12 lamp is __________ inch(es) in diameter and an T8 is _________. inches
1-1/2, 1
where noncombustible surface mmaterial 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
1/4 in. (6mm)
a 20 ampere branch circuit requires __________ AWG conductors, ignoring the effects of voltage drop.
12 copper
The open circuit voltage between the two terminals of a single pole switch on a lighting circuit when the switch is in the off position is?
120 volts
the smallest wire sizes for which overcurrent protection is specified in the code is _______.
14 AWG
alternating current, general use snap switches are UL-listed to control motors rated up to _________ horsepower.
2
recceptacle outlets must be installed in any wall space ________________ or more in width.
24in. (600mm)
the minimum lighting load requirement for dwelling units is _______ volt amperes per square ft
3
an arc flash can produce temps of
35,000
class A GFCI devices trip when a ground fault in the range of _________ milliamperes occurs.
4 to 6
The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed _________ percent
50
wall receptacles in a habitable room must be placed so they are no further than _________ feet from any point along the wall.
6
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.
6 feet
the ampacity of type NM cable shall be in accordance with _______________ conductor temp rating.
60 degrees C (140 degrees F)
LEDs have a life expectancy of _______ hours.
60,000-100,000
ceiling fan boxes designed to support more than _______ lbs must have the maximum weight the are designed to support included in the marking.
70
a continuous load shall not exceed ______ of the rating of the branch circuit.
80%
a dual rated conductor marked THHN/THWN is rated _______ when used in dry locations.
90 degrees C (194 degrees F)
the suffiz B in type NM-B nonmetallic cable means that the conductors have an insulation temp. rated ___________.
90 degrees C (194 degrees 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
the meaning of approved is
Acceptable to the authority having jurisdiction
The national electric code requires receptacles installed in a garage to be....
GFCI protected
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
listing or labeling of electrical equipment is done by a
Recognized testing laboratory
The national electrical code is a minimum standard of
Safety
