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Old 02-17-2008, 08:52 PM   #1
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Baseboard Heaters


Is it code to run 4 or 3 500w (240v) baseboard heaters off one 22amp(two pole) rated thermostat on 12/3 romex?

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Old 02-17-2008, 08:59 PM   #2
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Baseboard Heaters


A 20 amp circuit will easily handle 4 heaters of this size. (4x500w=2000w/240v=8.3A) A 15 amp circuit will suffice. Why the 12/3? The heaters are straight 240, so you only need 2 hot wires plus ground. 12/2 will work just fine. Be sure to reidentify the white as a "hot'' conductor.

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Old 02-17-2008, 09:13 PM   #3
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Baseboard Heaters


Quote:
Originally Posted by junkcollector View Post
A 20 amp circuit will easily handle 4 heaters of this size. (4x500w=2000w/240v=8.3A) A 15 amp circuit will suffice. Why the 12/3? The heaters are straight 240, so you only need 2 hot wires plus ground. 12/2 will work just fine. Be sure to reidentify the white as a "hot'' conductor.
Just a side note fixed electric heat must also be figured at 125%... so,
(4x500w=2000w*125%=2500w/240v=10.41A
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Old 02-17-2008, 10:48 PM   #4
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Baseboard Heaters


Thanks, I forgot that I did not need a neutral for the heaters.
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