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Circuit breaker hums

 
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pbierre



Joined: 24 Nov 2007
Posts: 1
Location: Pleasanton CA
PostPosted: Sat Nov 24, 2007 7:42 pm    Post subject: Circuit breaker hums Reply with quote
I'm in the US, and have a circuit breaker that hums so loud it is annoying (60Hz). When switched off, ah, the sounds of silence. I replaced the circuit breaker, and the new one hums just the same.

It's a 40A 2-pole CB, which switches 240VAC. The original purpose, a laundry outlet, is no longer in use. However, someone added some single-sided loads (120V), which the CB switches.

Is this a problem with unbalanced loading?

Any ideas how to silence this noise?

Pierre
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b
Moderator


Joined: 31 Aug 2004
Posts: 321
Location: michigan
PostPosted: Fri Nov 30, 2007 3:11 am    Post subject: Reply with quote
When you replaced the circuit breakers why didn't you replace with a 15 or 20amp single phase (dependent on the devices in your circuit)? The 40amps is probably not rated for your end use accordingly. Sounds like it needs to be properly configured for the 120V usage.
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