What Temperature Is Romex Wire Rated For
Southwire® Romex® Brand Simpull® Nm-B (Nonmetallic-Sheathed) Cable May Be Used for Both Exposed and Concealed Work in Normally Dry Locations at Temperatures...
Southwire® Romex® Brand SIMpull® NM-B (nonmetallic-sheathed) cable may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90°C (with ampacity limited to that for 60°C conductors) as specified in the National Electrical Code.
How hot can Romex wire get?
These are usually rated to withstand up to 194°F, but temperatures that approach this limit are not recommended. Two factors combine to heat up the wire. The first is the heat in the surrounding, or ambient, air in the attic.
What is the temperature rating for Type NM cable?
Type NM-B ampacity limitation shall be in accordance with the 60ºC conductor temperature rating, as specified in the NEC. Type NM-B is rated 600-volt for both exposed and concealed work in normally dry locations.
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