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You can use 90 degree celcius rated wire. It just must be derated to the 75 degree column in the book NFPA 70 article 310.16 table. Meaning, if you are running romex wire, you don't have to run larger wire in most situations.

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14y ago
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6mo ago

It is not recommended to use 90-degree wire with a breaker that specifies 75-degree wire unless it is specifically allowed by the manufacturer or electrical code. Using a wire with a lower temperature rating than the breaker can lead to overheating and potential fire hazards. It is important to follow the specified guidelines to ensure safety and proper functioning of the electrical system.

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Q: My breaker says use 75 degree wire can i use 90?
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