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View Full Version : What size wire for 30 amp 240 volt electric heater

mandan86
Dec 1, 2009, 02:31 PM
What size wire should I use for a 30 amp 240 volt electric heater for my guarge?
stanfortyman
Dec 1, 2009, 03:10 PM
If the draw is 30A then you need #8cu wire on a 40A breaker.