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In order to properly size the wire per National Electric Code (NEC) standards you will need to know the amperage and the distance of the device (heater) from the source (circuit breaker panel). In order to know the amperage one would need to know the voltage since amperage changes inversely with voltage.

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14y ago
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12y ago

let's assume you have a 240 volt supply and that the furnace is a resistive load. In this case 20000 / 240 = 83.33 Amps. This would require 3 AWG copper wire.

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Q: What size of wire and breaker do you need for a 20kw electric furnace?
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