Shack1

A dual-element fuse sized at approximately 125% of the full-load current rating of the motor adds extra overcurrent protection to the overload protection built into a food-waste disposer.

. open all

The disconnect for motor-driven appliances having a motor of greater than ____ must be within sight of the appliance.

1/8 hp

The total load of an air conditioner shall not exceed ____ percent of the rating of a branch circuit that also supplies lighting.

50

An individual motor disconnect must be in sight of the motor controller and must disconnect the controller. The NEC definition of in sight means that the controller must be visible and not more than ____ from the disconnect.

50 ft (15 m

To determine the minimum amount of CFM needed, multiply the square footage of the house by four.

False

When making a calculation for sizing a service or feeder, you must include 125 percent of the rating of the total connected fixed space heating load.

False

A duplex grounding-type receptacle is usually installed in an accessible location under the sink for plugging in the dishwasher and food waste disposer, and it does not have to be ____ protected.

GFCI

Because of the problem of people being scalded, many municipalities and states have implemented code requirements that water heater thermostats be set at not over 120 degrees F (49 degrees C).

True

Whole house vinyl wraps (____) stop airflow through wall cavities, as well as holding out wind-driven rain from getting behind wood, vinyl, brick, and stucco siding

Tyvek

The NEC allows which of the following disconnecting means for fixed appliances not over 300 volt-amperes or 1/8 horsepower?

a. branch-circuit breaker b. attachment plug cap c. separate disconnect switch Correctd. all of the above

Where the values of branch-circuit protection required for motors according to Table 430.52 do not correspond to standard ratings as listed in NEC 240.6, the next ____ rating is permitted to be used.

a. higher

On all types and ratings of receptacles, the grounding blade is ____ than the others to ensure that it makes its connection before the grounded conductors do and breaks its connection after they do (first make-last break).

longer

NEC 430.103 requires that a disconnecting means for a motor shall ____ ungrounded conductors.

open all

Small-appliance circuits are intended to serve countertops for cord-connected ____ appliances only

portable

For appliances that have no marked maximum overcurrent protection, the branch-circuit overcurrent protection is sized at ____.

the ampacity of the branch-circuit conductors supplying the appliance

NEC 424.3(B) considers fixed electric space heating to be a continuous load

true

Where a flexible cord is used to supply a room air conditioner, the length of the flexible cord shall not exceed ____ for 120-volt units.

10 ft (3.0 m)

When a separate branch-circuit is run to a wall-mounted oven or to a counter-mounted cooking unit, the branch circuit size is based on ____ of the nameplate rating of the appliance.

100 percent

UL requires that the power (wattage) input must not exceed ____ percent of the water heater's nameplate rating.

105

Dual-voltage-rated pump motors are rated ____.

115/230

Per the specifications, the branch-circuit conductors for food waste disposers and dishwashers are ____ AWG

12

Because a water heater represents a continuous load, the branch circuit must be rated not less than ____ percent of the water heater nameplate rating.

125

The disconnecting means and branch circuit conductors for an electric furnace shall be sized not less than ____ percent of the total nameplate load shown on the furnace.

125

A feeder or service neutral load can be figured at ____ of the load on the ungrounded conductors for ranges and ovens.

125 percent

When a non-motor-operated electrical appliance is not marked with its overcurrent protective device rating, NEC 422.11(E) states that the branch circuit overcurrent protection shall be ____

20 amperes where the appliance rating does not exceed 13.3 amperes

Article ____, Part VI, covers equipment grounding and equipment grounding conductors.

250

The total load of an air conditioner shall not exceed ____ percent of the rating of a separate branch circuit.

80

Baseboard heating units can be controlled by ____.

: a. line-voltage thermostats b. low-voltage thermostats c. on-off switches Correctd. both a and b

The article that covers cord-and-plug connected air conditioners is ____.

Article 440

Exhaust fan ventilating capability is rated in ____.

CFM

NEC 300.3(B) states that all conductors of the same circuit and, where used, the neutral and all equipment grounding conductors shall be contained within the same ____.

a. raceway b. cable tray c. trench, cable, or cord Correctd. all of the above

Overload protection prevents an exhaust fan motor from burning out if it ____ for any reason.

a. stalls b. overheats c. runs too fast Correctd. both a and b

The NEC permits flexible cords to be used to supply appliances where ____

a. the appliance is designed to permit ready removal for maintenance and repair b. the appliance weighs less than 100 pounds c. the appliance is identified for flexible cord connection Correctd. both a and c

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 Correctd. either a or b

The maximum flexible cord length permitted for a kitchen waste disposer is ____.

c. 3 ft (900 mm

NEC 422.12 on central heating equipment requires that ____.

central heating equipment be provided by a separate branch circuit

Cord sets rated 30 amperes are usually called ____ cords, and cord sets rated 40, 45, or 50 amperes are called ____ cords

dryer; range

Receptacles rated 30 amperes are referred to as ____ receptacles, and receptacles rated 50 amperes are called ____ receptacles.

dryer; range

Exhaust fans mounted into end gables or roofs of residences are available with an adjustable temperature control on the ____ of the fan.

frame

Motor disconnects are required to be ____.

horsepower-rated

A(n) ____ is NOT an acceptable disconnecting means for appliances

horsepower-rated switch

The NEC requires GFCI protection for ____.

hydromassage tubs and all their associated electrical components

A "unit switch" used as a disconnecting means for an appliance shall ____.

interrupt all ungrounded circuit conductors

When a food-waste disposer has an integral ON-OFF switch, an additional separately installed switch ____ required.

is not