Free NEC Electrical Questions and Answers 1

Question 1

Metal water pipes shall be bonded to  _____ when they are put in or attached to a building or structure.

Accepted Answer

any of the following

Answer

the grounded conductor at the service

Answer

the grounding electrode conductor

Answer

the service equipment enclosure

Question 2

When Type AC armored cable is installed parallel to the sides of rafters, studs, or floor joists in an accessible attic, .

Accepted Answer

neither guard strips nor running boards shall be required

Answer

the cable shall be protected by guard strips at least as high as the cable

Answer

either A or B

Answer

the cable shall be protected with running boards

Question 3

The manual switch for controlling the emergency lighting systems in a movie theater is usually permitted to be located .

Accepted Answer

in an accessible location in the lobby

Answer

in the motion picture projection booth

Answer

on the stage or platform

Answer

at any of these locations

Question 4

For use in PV source circuits within the PV array, single-conductor cable such as  _____ and single-conductor cable listed and labeled as solar
 photovoltaic (PV) wire are permitted.

Accepted Answer

USE-2

Answer

THHN

Answer

PVC-2

Answer

UF

Question 5

All single-phase, 125-volt, 15- and 20-ampere receptacles installed within six (6) feet of the top inside edge of the bowl of sinks located 
in  _____, must have GFCI protection for dwelling units.

Accepted Answer

all of these areas

Answer

garages

Answer

bathrooms

Answer

laundry rooms

Question 6

If ground-fault protection is not provided, it is permitted to ground the meter enclosure to the ____________ conductor on the load side of the service disconnect for a building or structure when the meter enclosure is adjacent to the service disconnecting.

Accepted Answer

grounded

Answer

grounding

Answer

phase

Answer

bonding

Question 7

The maximum permissible cord-and-plug-attached load to a 125-volt, 15-ampere receptacle connected to a 120-volt branch circuit supplying
 two (2) or more receptacles or outlets is .

Accepted Answer

12 amperes

Answer

10 amperes

Answer

7.5 amperes

Answer

15 amperes

Question 8

When a 200-ampere rated busway is tapped from a 600-ampere rated busway in industrial facilities only, what is the maximum permitted length 
of the 200-ampere busway if overcurrent protection is not provided for the 200-ampere busway?

Accepted Answer

50 feet

Answer

75 feet

Answer

100 feet

Answer

125 feet

Question 9

In the case of a commercial building, each of the four (4) size 2 AWG THWN insulated copper current-carrying conductors in a service-entrance conduit
 with a length of six (6) feet has an allowable ampacity of.

Accepted Answer

92 amperes

Answer

100 amperes

Answer

115 amperes

Answer

110 amperes

Question 10

Which of the following can be supplied by circuits with a maximum nominal voltage between conductors of 120 volts?

Accepted Answer

All of the above

Answer

The terminals of lampholders applied within their voltage ratings

Answer

Auxiliary equipment of electric-discharge lamps.

Answer

Cord-and-plug-connected or permanently connected utilization equipment