electrical, temperature rating of romex


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Old 08-07-00, 06:20 PM
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What is the temperature rating of the conductors for romex type nm-b ?
 
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Old 08-07-00, 06:36 PM
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The b in NM-b means the conductors contained within are rated 90degrees C. However, this limitation is to be used only when derating the ampacity of a conductor. Actual ampacities are based on 60degrees C.

This information is available in the National Electrical Code, Article 336 -NONMETALLIC-SHEATHED CABLE
 
 

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