Humming 30 amp braker

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Old 05-10-20, 12:29 PM
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Humming 30 amp braker

I have (4) very old 6 foot electric baseboard heaters that haven't been used in years. Today I turned on the thermostat and the heaters seemed to work but as soon as they were turned on the 30 amp breaker started humming. Didn't sound good so I shut everything down. Any idea what would cause the humming? Also looking at the panel box I only see 12/2 wires coming out and since all 4 haters are controlled by one thermostat it would seem that all 4 heaters are running off one cable. This doesn't sound right to me...is it?
 
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Old 05-10-20, 12:34 PM
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A 30A breaker would require #10 wiring. So if your heaters are run on #12 wiring and that 30A breaker hums.... you'll need to check further.

It is not a problem to put four heaters on a one wire/circuit as long as it's heavy enough.
Putting 30A of heating on #12 wiring would be a major problem.

Next step.... check the stated amperage draw of each heater. It will be on a tag.
Is this a single or double breaker ?
 
  #3  
Old 05-11-20, 06:18 AM
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Thanks, that's what I was thinking. To be safe I'm going to pull these old things out and start fresh.
 
 

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