Ampacity rating on Romex


Old 07-19-04, 07:02 AM
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Ampacity rating on Romex

Is it safe to install romex 'in' insulation? IE taking two bats of fiberglass and sandwiching them around the wire which is 2 inches from the bottom of the joist. I see nothing in the NEC which would require derating th cable, but it seems taht heat would not be able to dissipate like it doe sin open air.

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Old 07-19-04, 08:13 AM
Join Date: Sep 2000
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Posts: 18,497
Yes, it's safe. No additional derating is required for this condition.

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