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

NEC 110.26(A)(2) requires the width of working space to be at least 30 inches or the width of the equipment, whichever is greater.

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

NEC 110.34(A) Table specifies a minimum working space depth of 4 feet for Condition 1 at voltages up to 2.5kV.

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

Condition 3 involves exposed energized parts on both sides of the working space with no insulated or guarded barrier separating them.

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(D) requires adequate illumination for all working spaces about electrical equipment.

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

NEC 110.26(A)(2) requires the working space width to be the width of the equipment (52 inches) or 30 inches, whichever is greater, so 52 inches applies.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Working Space and Clearances 2