Duct seal in conduit ends?


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Old 06-01-20, 06:54 AM
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Duct seal in conduit ends?

I am running electrical though the side of my house using metal conduit, down through an LB. I assume silicone or some sort of high-quality caulk should be used to seal the pipe to the siding. However, I've been wondering about the wires inside the conduit - air exchange and potential source for bugs (very unlikely) or moisture.

I've seen a product called duct seal - a grey putty-like substance. Is that required or optional? Would adding it to plug the conduit on both ends be a code violation?
 

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06-01-20, 07:17 AM
joed
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Duct seal is the correct product. It is specifically designed to not affect the wire insulation.
I don't know if it is REQUIRED, but it won't hurt to use it.
 
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Old 06-01-20, 07:17 AM
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Duct seal is the correct product. It is specifically designed to not affect the wire insulation.
I don't know if it is REQUIRED, but it won't hurt to use it.
 
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Old 06-01-20, 05:00 PM
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Duct seal is required in conduit that is subjected to different temperatures. 300.7
 
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Old 06-02-20, 04:23 AM
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Thanks! I thought I had read that somewhere, but couldn’t remember the part of code or what keywords to search.
 
 

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