NEC Electrical Assessment 2

Question 1

Per NEC, what is the standard color used to identify the grounded (neutral) conductor in a 120/240V system?

Accepted Answer

White or gray

Answer

The NEC requires grounded conductors to be identified by white or gray insulation or three white stripes.

Question 2

What is the minimum required headroom for working space about electrical equipment rated 600V or less?

Accepted Answer

6 ft 6 in

Answer

NEC 110.26(A)(3) requires a minimum headroom of 6 ft 6 in for working spaces about electrical equipment.

Question 3

A continuous load is defined in the NEC as a load where the maximum current is expected to continue for at least how long?

Accepted Answer

3 hours

Answer

The NEC defines a continuous load as one whose maximum current continues for 3 hours or more.

Question 4

When sizing conductors and overcurrent protection for a continuous load, the load is multiplied by what factor?

Accepted Answer

125%

Answer

NEC requires the rating to be not less than 125% of the continuous load.

Question 5

What is the maximum number of current-carrying conductors allowed in a raceway before ampacity adjustment factors must be applied?

Accepted Answer

3

Answer

Adjustment factors per NEC 310.15(C)(1) apply when more than 3 current-carrying conductors are in a raceway.

NEC Practice Test