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The most likely cause for a loadcenter [circuit breaker box] to hum loudly when a high capacity load is connected is that there is a loose connection.

This could be a loose fitting breaker, bad internal contact in a breaker or a loose terminal screw.

High loads and loose connections mean resistance and voltage drop. This equals heat.

Your service entrance panel is at risk.


NOW! <><><> It can also mean that the breaker is just at the tripping point, and is the magnetic kind. The circuit may be too small for the load. It could also be that the load, plus the other loads are just under the trip point on the main breaker.

<><><> As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed. Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB



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โˆ™ 2009-06-23 09:41:31
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Q: Why does the circuit breaker box hum loudly when the auxiliary electrical heat for a geothermal home heating system comes on?
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