Wiring Final
Where a flexible core is used to supply a room air conditioner, the length of the flexible cord shall not exceed _____ for 120-volt units.
10ft (3.0m)
Dual-voltage-rated ump 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 _____ % of the total nameplate load shown on the furnace.
125
An electric water heater is continuous load that requires that the branch circuit rating must not be less that _____ of the nameplate rating.
125%
Most installations require motor overload protection not to exceed _____ of the motor's full-load current rating.
125%
Low-voltage wiring used for door bell and thermostat wiring in a residence is generally Class 2 wiring, which has a thermoplastic insulation with a voltage rating of not less than _____ volts.
150
Chime transformers used in dwellings are generally rated _____ volts.
16
Water pumps that contain all required starting and protection components and connect directly to the pressure switch with no above-ground controller, are often called _____ pumps.
2-wire
Because they have internal overload protection, listed Class 2 transformers are permitted to be supplied by branch circuits over current protection not exceeding _____ amperes.
20
The maximum current and voltage rating permitted by Code for cord-and-plug connected air-conditioner is _____ at 250 volts.
40 amp
An individual motor disconnect must be in sight of the motor controller and must disconnect the controller. The NEC definition of insight means that the controller must be visible and not more that _____ from the disconnect.
50ft (15cm)
Thermostats are usually mounted approximately _____inches above the finished floor.
52
The type of cable most often used for television signal distribution in new residences is _____.
75-ohm TG6 coaxial
The total load of fan air conditioner shall not exceed _____ percent of the rating of a separate branch circuit.
80
Exhaust fan ventilating capability is rated in _____.
CFM
_____ circuits offer alternative wiring methods regarding voltage, power limitations, wire size, derating factors, over-current protection, physical protection, insulation, and materials that differentiate these types of circuits from conventional wiring methods.
Class 1 Class 2 Class 3
Transformers and low-voltage wiring for doorbells are classified as _____ circuits under article 725.
Class 2
Chime transformers are listed as _____ because of their low voltage rating and power limitation.
Class 2 transfromers
Green
Equipment grounding conductor
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
White
Grounded (neutral) conductor
Article 430 contains requirements for motor installations. The section that requires a motor disconnect to be within sight of the motor or capable of being locked is _____.
NEC 430.120
Black/Red
Phase (hot) conductors
The disconnected for motor-driven appliances having a motor of greater than _____ must be within sight of the appliance.
1/8 hp
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
When 120-volt receptacles and TV outlets are mounted in double-gang boxes, _____ is required in the box to isolate the TV conductors form the power wiring.
a barrier
All of the following are acceptable disconnecting means for appliances, except for _____.
a horsepower-rated switch
Bathroom exhaust fans, vents for clothes dryers, and similar high-humidity sources are never to be vented directly into the _____ or other dead spaces.
attic
Most residential heating systems are packaged units in which many items are pre-assembled, pre-wired parts of the furnace of boiler. The are included in an integrated printed circuit board module, which is the "_____" of the system.
brain
The point where the telephone company ends and the homeowner's interior wiring begins is called the _____.
demarcation point
Residential thermostats should be located where they will not be influenced by _____.
drafts or currents from air registers, radiated heat from appliances, lamps, etc direct ray of the sun
Receptacles rated 30 amperes are referred to as _____ receptacles, and receptacles rated 50 amperes are called _____ receptacles.
dryer, range
The air-conditioner load shall not exceed _____ percent of the branch-circuit ampacity if other loads are also served.
fifty
Never connect the green equipment grounding conductor to the _____ branch circuit conductor.
grounded/white
The two general methods of connecting food-waste disposers are _____ and _____
hard-wired cord-and-plug connection
A disconnect need no the in sight of motor and driven machinery if the disconnect can be _____ in the open OFF position.
individually locked
Class 2 wiring _____ permitted in the same raceway, cable, compartment, outlet box, or fitting with light and power conductors, even if the Class 2 conductors have the same 600-volt insulation as the power conductors.
is not
Submersible pump cable supplied with well pump assemblies _____ also suitable for direct burial.
is not
Typical Class 2 wiring applications in homes include all of the following except for _____
low-voltage lighting
Unit switches that have a _____ are acceptable as the disconnecting means for that appliance.
marked "off" position
A hydro massage tub is a _____bathtub equipped with a recirculating piping system, pump and associated equipment.
permanently installed
Small-appliance circuits are intended to serve counter tops for cord-connected _____ appliances only.
portable
Class 2 circuits are _____ and are considered safe from fire hazard and from fire hazard and from electric shock hazard.
power-limited
A _____ is described in the NEC as any electric circuit that energizes signaling equipment.
signaling circuit
If a 115/230-volt, dual-voltage motor has a full-load current of 8 amperes at 230-volts, the same motor connected for 115-volt operation will draw _____ amperes.
sixteen
For appliances that have no marked maximum over-current protection, the branch-circuit over-current protection is sized at _____.
the ampacity of the branch-circuit conductors supplying the appliance
The NEC permits flexible cords to be used to supply appliances where _____.
the appliance is designed to permit ready removal for maintenance and repair the appliance is identified for flexible cord connection
According to NEC 250.142(B) NEVER ground an appliance to the _____ grounded circuit conductor.
white
