E2 Working Space and Clearances 2

Question 1

According to NEC 110.26, what is the minimum width of working space in front of electrical equipment rated 600V or less?

Accepted Answer

The width of the equipment or 30 inches, whichever is greater

Answer

The width of the equipment or 24 inches, whichever is greater

Answer

36 inches regardless of equipment width

Answer

30 inches regardless of equipment width

Question 2

When electrical equipment rated over 1000V is installed, NEC 110.34 specifies working space conditions. For Condition 1, what is the minimum depth of working space for equipment up to 2.5kV?

Accepted Answer

4 feet

Answer

3 feet

Answer

5 feet

Answer

6 feet

Question 3

What does NEC 110.26(A)(1) Condition 3 describe regarding working space?

Accepted Answer

Exposed live parts on both sides with no insulated barrier

Answer

Exposed live parts on one side and grounded parts on the other

Answer

Grounded parts on both sides of the working space

Answer

Insulated parts on one side and a wall on the other

Question 4

Which NEC section governs the illumination requirements for working spaces about electrical equipment?

Accepted Answer

NEC 110.26(D)

Answer

NEC 110.26(E)

Answer

NEC 110.26(C)

Answer

NEC 110.26(F)

Question 5

A commercial switchboard is 52 inches wide. What is the minimum required working space width in front of it?

Accepted Answer

52 inches

Answer

30 inches

Answer

36 inches

Answer

60 inches

Question 6

Under NEC 110.26(B), what is the minimum headroom for working spaces about service equipment, switchboards, and panelboards?

Accepted Answer

6 feet 3 inches

Answer

6 feet

Answer

6 feet 6 inches

Answer

7 feet

Question 7

When must a dedicated electrical space extend from the floor to a structural ceiling per NEC 110.26(F)(1)(a)?

Accepted Answer

For all indoor electrical equipment rated 1000V or less

Answer

Only for equipment rated over 1200A

Answer

When the equipment exceeds 6 feet in height

Answer

Only for switchboards and panelboards, not for branch circuit panels