Q. Raceways or cable trays containing electric conductors shall not contain which of the following?
A) Pipe, tube or equal for steam, water, air or gas.
B) Pipe, tube or equal for drainage.
C) Any service other than electrical.
D) All of the items listed in answers A, B, and C.

Answer: D

As per 300.8, items other than electrical (as listed in options A, B, and C above) are not permitted in raceways and cable trays. The Code specifically states, “Raceways or cable trays containing electric conductors shall not contain any pipe, tube, or equal for steam, water, air, gas, drainage, or any service other than electrical.”

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.