C-10 Electrical Contractor Practice Exam

Question 1

At what minimum height must open conductors of 600V or less be installed above finished grade when crossing a public street?

Accepted Answer

18 feet

Question 2

Service-entrance conductors entering through a raceway must have the raceway sealed at the service head primarily to prevent:

Accepted Answer

Moisture condensation from entering the building

Question 3

Metallic wireways must not be filled with conductors beyond what percentage of their cross-sectional area at any point?

Accepted Answer

20%

Question 4

What is the maximum number of quarter-bends (90-degree bends) permitted between pull points in a conduit run?

Accepted Answer

Four 90-degree bends

Question 5

What is the minimum burial depth for direct-buried Type UF cable installed in a general area not subject to vehicular traffic?

Accepted Answer

24 inches

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