How heat effects NM-B wire


Old 09-28-09, 08:21 AM
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How does heat effects NM-B wire

I am installing radiant heat in existing floor. The temperature will be 120 to 160 F. How will that effect the NM-B rated wire running in the same cavity?

Last edited by jaime3; 09-28-09 at 08:45 AM.
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Old 09-28-09, 09:00 AM
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NM-B cable is rated for exposure to 90C (194F), however I would do my best to avoid putting any wiring near the heat source. It may even be worth moving what's there.

Are you sure the existing wiring is NM-B? If it is just plain NM then the ambient temperature rating is only 60C (140F).

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