Licensed Electrical Contractor NEC General Requirements Questions and Answers

Question 1

According to NEC Article 90, what is the primary purpose of the National Electrical Code?

Accepted Answer

The practical safeguarding of persons and property from hazards arising from the use of electricity.

Answer

To provide design specifications for efficient electrical systems.

Answer

To serve as an instruction manual for untrained persons.

Answer

To guarantee the future expansion of electrical use in all installations.

Question 2

An electrical panel is to be installed in a commercial building. The system is a 277/480V, 3-phase, 4-wire circuit. The wall opposite the panel is constructed of concrete block. What is the minimum required working space depth in front of the panel?

Accepted Answer

42 inches

Answer

30 inches

Answer

36 inches

Answer

48 inches

Question 3

Which of the following best defines a 'Readily Accessible' location according to NEC Article 100?

Accepted Answer

Capable of being reached quickly without climbing over or removing obstacles.

Answer

Capable of being reached by using a portable ladder.

Answer

Guarded by a locked door that only qualified persons can open.

Answer

Admitting close approach without the need for tools to open a panel.

Question 4

A contractor is installing service equipment in a commercial building (a non-dwelling unit). According to NEC 110.24, which information must be legibly field-marked on the equipment?

Accepted Answer

The maximum available fault current and the date the calculation was performed.

Answer

The arc-flash hazard boundary.

Answer

The name of the installing contractor.

Answer

The short-circuit current rating of the panelboard.

Question 5

Unless identified for use in the specific operating environment, NEC 110.11 prohibits the location of conductors or equipment in all of the following locations EXCEPT:

Accepted Answer

In areas with direct sunlight exposure.

Answer

In damp or wet locations.

Answer

Where exposed to gases or fumes with a deteriorating effect.

Answer

Where exposed to excessive temperatures.

Question 6

When installing electrical equipment, the NEC requires that it be firmly secured to the surface on which it is mounted. Which section covers this general requirement?

Accepted Answer

NEC 110.13(A)

Answer

NEC 110.3(B)

Answer

NEC 110.12(A)

Answer

NEC 110.22