I have an SBSG brand 50-amp GFCI disconnect for my spa. It has a loud
hum. I have talked to the factory, and they suggested loosening the
screws to the contactor, then retightening. That helped for a little
while, but now it is back worse than ever. Being mounted outside the
kitchen wall, it resonates throughout the kitchen, and is very
annoying. Is it possible to use some nylon or teflon washers under
the contactor screws without violating code?
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