Residential Wiring Review

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

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


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