Half-round and flat-top raceways not over 4 inches in width must be covered by ____ or more of concrete (or wood).
A) .25 inches
B) .5 inches
C) .75 inches
D) one inch

Question

Quizplus · Accepted Answer

According to NEC Article 386.30, half-round and flat-top raceways not over 4 inches in width must be covered by at least 0.75 inches of concrete (or wood) to provide mechanical protection. Choice C (0.75 inches) is the only option that meets this requirement.

Half-Round and Flat-Top Raceways Not Over 4 Inches in Width