Chapter 20&23 Final

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

1/8 hp

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

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

50

When a central air-conditioning unit label states "maximum fuse size 50 amperes," what type of circuit-breaker is permitted to provide running overload protection?

50-ampere circuit-breaker

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

70 percent

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

80

All of the following are acceptable disconnecting means for appliances, except for ____.

a HP-rated switch

A line-voltage thermostat used to control household heating apparatus rated 240 volts disconnects ____.

both ungrounded conductors

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

interrupt all ungrounded circuit conductors

Supply voltage affects the heat output of electric heating appliances. Although the appliance nameplate will show the kilowatt rating at a nominal voltage, such as 208 or 240, actual output depends on the voltage available at the terminal of the equipment. The ____ the voltage, the ____ the heat output.

lower, lower

When an appliance is not marked with its maximum overcurrent protection, the branch circuit protection device is sized according to ____.

the ampacity of the branch circuit conductors

On circuits supplying cord-and-plug connected air conditioners, the branch circuit overcurrent protective device rating is not permitted to exceed ____.

the ampacity of the branch circuit conductors, recept and A/C connection

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

there are connections & ready for removal to repair

NEC 422.12 on central heating equipment requires ____.

to be on a separate branch circuit

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

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

Article 440

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

larger

Household cooking device demand factors shown in Table 220.55 are normally ____ than the appliance nameplate rating.

less

Baseboard heating units can be controlled by ____.

line-voltage & low voltage thermostats