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depending on the insulation type. Most 12 AWG wire will carry that current capacity either. Unless you are running it in the desert or some place extremely hot where derating becomes a factor.

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12y ago
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5mo ago

It is not recommended to run a 12 amp heater on 125 feet of 12-3 wire as it may cause voltage drop and overheating issues. It is recommended to use a larger wire gauge, such as 10-3 wire, to safely power the heater over that distance.

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Q: Can you run a 12 amp heater on 125 feet of 12-3 wire?
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