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· I have gas!
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Discussion Starter · #1 ·
I'm wiring a pair of light switches using 12/2 NM in a metal stud wall around a chimney. So 1 wire in and 2 wires following that wire back around the chimney to a switched receptacle and ceiling fan.
With that said, I drilled 7/8" holes and added bushings to the metal studs. There is enough room for 3-12/2 cables without pinching the wire. Would the bundling of 3-12/2 cables for 5 feet need to be de-rated below 20AMPs?
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