I have a 220 breaker that hums when turned on. It goes to a second breaker at the AC. Then that breaker feeds my well. I replaced both breakers. When the AO 200 a60 breaker is on at the AC box that feeds the well, it makes the breaker in the main box hum for a few seconds and then it trips the main box breaker. Any help please!
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Something is not drawing the current correctly. You need a meter to test it, time to call in an electrician.
Just a word of advice- unless you really know what you're doing, call in a professional who is licensed and insured. If you fix this yourself and there is a fire, the insurance company will investigate the cause of the fire.
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