Midterm Review

A surface-mounted incandescent luminaire (light fixture) mounted in a clothes closet must maintain a clearance of at least ______ inches to the storage area.

12 in

all fixed storage water heaters of 120 gallons or less are required to have a branch circuit rating of not less than____ percent of the name plate rating of the water heater.

125

ignoring the affects of voltage drop, a 20 amp breaker requires ____conductors

12AWG copper

Before corrections, the maximum allowable ampacity of a 2/0 AWG copper thhn/thwn conductor is____.

145

The NEC requires that the ___ column of table 310.15(B)(16) be used to determine amps when Type NM cable is used for premises wiring

60 C

incandescent dimmers can be used to control fluorescent luminaries

false

A GFCI receptacle or circuit breaker will "trip" when is senses a difference in the amount of current flowing in the ungrounded conductor versus the amount of current flowing in the ________.

grounded conductor (hot and neutral)

an____ consist of two bends, usually having the same degree of bend, made to avoid an obstruction blocking the pipe

offset

a series circuit consist of a power source, circuit conductors, and a lamp. If the film,ent in the lamp is broken, the circuit is called an____ circuit.

open

generally, when sizing conductors and OCPD's, the load to be served equals___

(1.0 x the noncontinuous loads) and 1.25 x the continuous loads)

what is the area of a right triangle that measures 5 feet on side and 6 feet on the other side?

(LxW)/2= 15

Type UF cable installed inPVC under a building must be installed at least___ inches deep.

0

when runningNMC through boded hole in a stud, the nearest edge of the bored hole shall not be less than___inches from the face of the stud unless the cable is protected by a 1/16 inch-thick metal steel plate.

1 1/4

where a branch circuit is protected with 20-amp fuses, the smallest circuit conductors that can be installed are___ awg copper.

12

rigid metal conduit installed under a 4-inch concrete slab with no vehicular traffic must be installed at least____ inches deep.

4

where it appears on the name plate ,____ is used to determine the minimum size branch circuit conductors that can be used for the AC unit.

MCA

what organization actually develops and publishes the National Electrical Code?

National Fire Protection Association

transient voltage surge suppressors are used to minimize the damage to connected equipment caused by___

line surges and spikes

What kind of electrical charge does an electron have?

negative

A receptacle under a kitchen counter of a dwelling is used to supply power to a dishwasher. This receptacle is____ to be connected to one of the two small-appliance branch circuits.

not permitted

An AFCI circuit breaker can be used instead of a standard circuit breaker and will trip when____

overload, a short circuit, arcing condition

In unfinished basements where NM cable is run at angles with joists, it shall be permissible to secure cables not smaller than _______ or conductors directly to the lower edges of the joists.

two 6AWG and three 8 AWG

the____ supplied to the connected load increases when batteries are connected in series.

voltage

the circular mil area of a 250 kcmil bare copper cable is____ cmils.

250,000

the circular mil area of a 14 AWG bare copper wire is___cmils

4110

according to the NEC, any location exposed to weather is considered a___location

wet

Are outdoor luminaires permitted to be attached to living trees?

yes

the NEC requires that conductors and over-current devices for electrical space heaters (such as ceiling mounted heater) be sized to carry___?

(rated current)x(1.25)

the maximum distance permitted between a box and the first strap for an installation using 1" LFMC is ____ ft?

1

The diameter of a T-12 lamp is ____.

1.5 in

unless identified for contact with insulation, all parts of recessed luminaries shall be at least____ inches from combustible materials per the NEC

1/2 inch (410.116)

although not limited by the NEC, if a 15-amp residential circuit is to be loaded only up to its rating, how many outlets can be put on the 120 volt circuit if the outlets are rated at 120 V A per outlet?

15

Convenience receptacles connected to 20-ampere branch circuits are permitted to be rated _____.

15 amp, 125vlolt or 20amp, 125volt

30 degree multiplier for offsets?

2

the fewest number of 20-amp kitchen countertop receptacle circuits that are permitted to be installed in a kitchen in a house is____?

2

a 6-32x2.5 machine screw has a length of ____ inches

2.5

for a 208/120 -volt, 3phase, 4-wire supply system the voltage from A phase to B phase is?

208

Thermal installation shall not be installed above or within___ inches of the sides of a recessed luminaire. This is type Non-IC luminaire.

3

what is the minimum horizontal clearance for imaging a light from the rim of a bathtub or spa?

3 feet

lighting tracks that are ____ feet or less in length must be fastened at a minimum of two places.

4

Luminares weighing more than___ pounds are required to be supported indecently of the outlet box.

50

when performing load calculations in article 220, the load for household electric clothes dryer in a dwelling unit shall be___ watts or the nameplate rating, whichever is larger, for each dryer served.

5000

which of the following is NOT a standard size circuit breaker?

55

wall receptacle outlets in a residence must be placed so that no point along the floor line is more than how many feet?

6

according to the NEC, combustible material adjacent to luminaries cannot be subject to temp. exceeding___

90 degrees celsius

voltage in a series circuit of three resistive elements uses which formula?

E(total)= E1+E2+E3

branch circuit are rated according to their____

Over current protection device

Which of the following boxes could be used for three each 10 AWG and six each 12 AWG conductors?

all

The NEC allows ______ receptacle outlets to be connected on a 120-volt residential lighting or small appliance branch circuit.

an unspecified number

A Class A GFCI receptacle or circuit breaker is designed to trip at levels of fault current _________.

between 4 and 6 mA

when doing voltage drop calculations, where is the cross-sectional area in circular mils located?

ch.9 table 8

a___ is a unit of an electrical system, that is intended to carry or control electric energy as its principal.

device

electrical current is the flow of_____.

electrons

as more loads are added to a series circuit , the resistance of the circuit____

increases

a pendant luminaire mounted in a closet___

is not permitted

AFCI protection___ when a ten foot branch circuit extension is added to a dwelling family room per the NEC.

is required

when it is____, a raised plater ring is permitted to increase the maximum number of conductors permitted in an outlet box

marked with its cubic-inch volume

instructions for most dimmers state that they should not be used to control_____.

receptacle outlets

True or False? The NEC permits a recessed luminaire (lighting fixture with an enclosed & gasketed trim, listed for wet locations) to be installed in the ceiling within a shower stall has a 7-foot ceiling.

true

in walls or ceilings made of sheetrock, brick, or concrete it acceptable to have the front edge of the box set back as much as 1/4 inch from the finished surface

true