Turn Off Power at the Breaker and Test
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Turn off the power at the breaker, not just at the wall switch. A dual-switch wiring setup can leave one circuit live even when the switch is down. Use a voltage tester to confirm.
Find the breaker for the room, flip it off, then come back to the fan and press a non-contact voltage tester against the wires you'll be touching. Only continue when the tester stays silent.
If the tester chirps with the breaker off, you're on a circuit you didn't expect. Stop and trace the right breaker before you touch anything else.
Tip
Non-contact testers cost about $15 and work right through wire jackets. Klein's NCVT is the standard pen for residential work.











