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I have low voltage wire under my deck. I would like to drill a small hole (1/4 in or less) and feed the cable through the deck ledger board and the house's rim joist so that I can keep the transformer inside (the basement which is unfinished). I would then fill the hole with silicon to keep water and bugs out.

Is this an absurd idea? Is there a better way to do it?

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I'd seal around the cable with duct seal, instead of silicone.

Duct Seal

It stays pliable, and will not interact with the cable jacket.

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as the NEC master, are you aware of any code sections that govern this application? – mac Oct 10 '13 at 14:38

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