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Theory
NEC
NEC
NEC and Calculations
Calculations
100

What is the power loss in watts of a conductor that carries 24A and has a voltage drop of 7.2V?

What is 175W

100
When installing PVC conduit underground without concrete cover, there shall be a minimum of ______in. of cover.
What is 18 inches
100

The requirement to maintain a 3 foot vertical clearance from the edge of a roof does not apply to the final conductor span where the service drop is attached to_____________.

What is the side of a building

100

For wiring methods "on or attached to the surface, or behind access panels designed to allow access" is know as

What is exposed

100

What is the Ac OHMS to neutral resistance for 100ft of 3 awg copper conductor

What is 0.025

200
The total circuit resistance of two 12AWG conductors(each 100ft long) is 0.40 ohms. If the current of the circuit is 16A, what is the power loss of the conductors in watts?
What is 100W
200
Rigid Metal Conduit that is directly buried outdoors shall have at least ________in. of cover.
What is 6 inches
200
The recommended maximum voltage drop on branch circuit conductors is _______ percent?
What is 3 percent
200

True or false: An overload is the same as a short circuit or ground fault.

What is False

300
What does it cost per year (at 8 cents per KWH) for the power loss of a 12 awg circuit conductr (100ft long) that has a total resistance of 0.40ohm and current flow of 16A?
What is $70.00
300
Duct Heater controller equipment shall have a disconnecting means installed within______the controller except as allowed by 424.19(A)
What is sight from
300
Where the circuit breaker handles are operated vertically, the up position of the handle shall be the ________position.
What is on position
300

A nursing home is an area used for housing and nursing care, on a 24 hour basis, of ______or more persons.......

What is four

300

What is the feeder/service calculated load for a 4kw dryer?

What is 5 KW

400
What is the nameplate FLA for a 20HP, 208V, three phase motor with a 90 percent power factor and 80 percent efficiency?
What is 58 amps
400

True or false: Type NM cable shall not be used in one- and two family dwellings exceeding three floors above grade.

What is False

400
Wiring from an emergency source can supply emergency or other loads, provided the conductors________.
What is terminate in a separate vertical sections of a switchboard.
400

Receptacles shall not be grounded or ganged in enclosures unless the voltage between adjacent devices does not exceed ________.

What is 300V

400

Both units of a duplex apartment require a 100a main; the resulting 200a service will require ________copper conductors.

What is 3/0AWG

500

If the primary voltage of a transformer is 480v and the secondary voltage is 240V, the turns ration is what?

What is 2:1

500

FMC shall be secured and supported __________

What is intervals not exceeding 4 1/2 ft

500
There shall be no reduction in the size of the neutral or grounded conductor on ______loads supplied from a 4 wire, wye-connected, three phase system.
What is nonlinear
500
Which of the following is not a standard size fuse or inverse time circuit breaker? 45 70 75 80
What is 75
500

What is the feeder service calculated load for one 6kw and two 3 kw cooking appliances

What is 9.3 kw