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First, what panel doesn't have a main breaker? If there's nothing killing power at the panel, have that fixed. Having said that, turn off the breaker you need to pull, remove the wires, remove the breaker, install the new breaker, reconnect wires, turn on new breaker. Gloves? Not sure what good they really do. I never kill power at the main breaker when changing or adding breakers.
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Nick
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