FREE NEC Electrical Assessment Questions and Answers

Question 1

Snap switches cannot be ganged or grouped in enclosures with other receptacles, snap switches, or similar devices unless they are positioned so that the voltage between adjacent devices is _________ volts or less, or unless they are positioned in enclosures with barriers that are securely installed and clearly marked between adjacent devices.

Accepted Answer

300 volts

Answer

240 volts

Answer

480 volts

Answer

120 volts

Question 2

General-use dimmer switches can only be used for things that are permanently installed, unless they are listed for controlling other loads and installed accordingly.

Accepted Answer

incandescent luminaries

Answer

paddle fans

Answer

fluorescent lights

Answer

lighting receptacle outlets

Question 3

What are the terms for the common point on a wye-connection in a polyphase system, the midpoint of a 3-wire, direct-current system, the midpoint of a single-phase component of a 3-phase delta system, and the midpoint of a single-phase portion of a 3-wire, direct-current system?

Accepted Answer

Neutral Point

Answer

Service Point

Answer

way point

Answer

Plenum

Question 4

Branch circuit conductors that provide more than one outlet for _________ loads must have conductors with an ampacity that is at least equal to the branch circuit rating.

Accepted Answer

ungrounded

Answer

grounded

Answer

grounding

Answer

hot leg

Question 5

Which of the following needs to be present for a conductor of size 4 AWG or bigger to enter a panelboard?

Accepted Answer

An insulated bushing

Answer

An insulated grounding conductor

Answer

A bonding jumper

Answer

A grounding clip

Question 6

A luminaire (fixture) cannot be supported by the screw shell of a lampholder if it weighs more than _________ pounds or measures more than 16 inches in any direction.

Accepted Answer

6 pounds

Answer

10 pounds

Answer

12 pounds

Answer

8 pounds

Question 7

Except for __________, panelboards must have overcurrent protection.

Accepted Answer

existing panelboards used for individual residency service equipment.

Answer

panelboards supplying another structure within the same panelboard.

Answer

panelboards containing only single-pole overcurrent devices.

Answer

panelboards containing less than 42 overcurrent devices.

Question 8

Wherever flexible cords with attachment plugs are to be used, a receptacle outlet needs to be constructed, and receptacles are __________ for the same type of cords there where they can be permanently linked.

Accepted Answer

permitted to be omitted

Answer

permanently installed

Answer

installed

Answer

marked

Question 9

Electrical installations must be built so that there is a minimal likelihood of fire or other combustion-related products spreading when they are placed in vertical shafts, ventilation or air-handling ducts, or hollow spaces. Openings surrounding electrical penetrations into or into fire-resistant-rated ceilings, floors, partitions, or walls must be ________ with approved techniques to preserve the current fire-resistance rating.

Accepted Answer

firestopped

Answer

caulked or taped

Answer

blocked

Answer

sealed

Question 10

What is the maximum ampere rating, at the applied voltage, of the switch for general-purpose snap switches serving inductive loads?

Accepted Answer

50%

Answer

60%

Answer

85%

Answer

75%