In the rv section 1192 is there a code that prohibits 120v wiring in ac ducts? I have a overheads ac units that is full of electrical an tv wiring. It fills the duct about 70% and restricts the air flow.
1192 sends one to NEC 551.
NEC 551 sends one to NEC Articles:
551.47 Wiring Methods.
(A) Wiring Systems. Cables and raceways installed in accordance
with Articles 320, 322, 330 through 340, 342 through 362,
386, and 388 shall be permitted in accordance with their applicable
article, except as otherwise specified in this article. An
equipment grounding means shall be provided in accordance
So one needs to research the Article for whatever cable is installed, to figure out the rules. It may be allowed for environmental air (plenum) if metal, or plenum rated. Probably those Articles send you back to general requirements (300).
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