FREE E2 Working Space and Clearances Questions and Answers

Question 1

What is the minimum depth of working space required in front of a 480V switchboard with exposed live parts on one side and grounded parts on the other side?

Accepted Answer

3 feet 6 inches

Answer

3 feet

Answer

4 feet

Answer

5 feet

Question 2

The minimum required width of the working space in front of a 24-inch wide panelboard must be:

Accepted Answer

30 inches

Answer

24 inches

Answer

36 inches

Answer

The width of the panelboard plus 6 inches

Question 3

What is the minimum headroom of working space required for service equipment located in a commercial building?

Accepted Answer

6 feet 6 inches or the height of the equipment, whichever is greater

Answer

6 feet

Answer

7 feet

Answer

The height of the equipment only

Question 4

A large switchboard is rated 1200 amperes and is over 6 feet wide. What is required for personnel entrance and egress?

Accepted Answer

One entrance at each end of the working space

Answer

One entrance of at least 36 inches wide

Answer

Panic hardware on all doors within 25 feet

Answer

A single entrance located in the center of the equipment

Question 5

Equipment doors that open into the required working space must be able to open to an angle of at least:

Accepted Answer

90 degrees

Answer

45 degrees

Answer

75 degrees

Answer

180 degrees

Question 6

Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, or motor control centers installed:

Accepted Answer

Indoors

Answer

Outdoors only

Answer

In wet locations only

Answer

Only if the voltage exceeds 240V