Electrical Question from Martin about 240 Volt Wall Heater Wiring
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Will 12-2 wire and a 20 amp breaker handle a 4000 watt 240 volt wall heater? © By: Dave Rongey |
Electrical Question from Martin about 240 Volt Wall Heater Wiring
Received from Martin a Homeowner in Tacoma, WA
[ad#block]Question: Will 12-2 wire and a 20 amp breaker handle a 4000 watt 240 volt wall heater?
Dave’s Reply:
Thanks for your electrical question.
Hi Martin – A 4000 watt 240 volt wall heater will require about 16.6 amps. Although a 12/2 wire is rated at 20 amps it would be best to install a 10/2 wire for a 4000 watt 240 volt heating unit. This would ensure that the circuit is safely loaded at 80 % of the capacity of the wire.
When using a 2-wire Romex cable with a ground understand that a 2-pole circuit breaker will be required and the white wire will need to be identified with red or black electrical tape as a power conductor at both ends of the circuit.
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