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How old and what manufacture is the CB in the house? When the CB trips is it hot to the touch? Look at the wires connected to the CB going to HP, and make sure they are tight. If you are able, pull the CB and make sure the clips on the bus are not burned. DO NOT TOUCH THEM-WITHOUT TURNING OFF YOUR MAIN BREAKER AND TESTING THEM DEAD WITH A VOLT METER. Loose wiring will cause high resistance, which causes more amp draw across higher resistance, which makes heat. Residential CB are thermo operated
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