If the electrical system to be installed operates at a potential higher than _________volts, the nonmetallic conduit must be encased in not less than 2 in. (50mm) of concrete.
A) 300
B) 400
C) 500
D) 600

Question

Quizplus · Accepted Answer

According to the National Electrical Code (NEC), nonmetallic conduits must be encased in at least 2 inches of concrete if the system operates at a potential higher than 600 volts.

If the Electrical System to Be Installed Operates at a Potential