?
Tuesday, December 6, 2016
Question:
Is THHN or THWN rated for installation in cabletray?
Al Lamke
A
Answer:
Hey Al thanks for your question. Some are. In industrial establishments where it is ensured that only qualified people service the cable trays, single conductors in sizes 1/0 AWG or larger are allowed to be installed in cable trays - if they are marked for use in cable trays as stated in 392.10(B)(1)(a). Those types of insulation are also allowed if part of a wiring method as stated in 392.10(A).