![]() If your test shows 0v on all terminals, it is safe to proceed with replacing the existing switch with your smart device.If the light/s are still on, the wrong breaker was switched off repeat step 7. Go back to your worksite to check if the light/lights are now off if they are off, you can be confident but not yet certain there is now no power to that circuit, do the same multimeter test performed earlier to confirm all wires have no voltage on them.Also, putting some tape across the breaker switch warns that someone may be working on that circuit. Safety first!! – put a note on the panel indicating that the switch must remain off as someone is working on the circuit. Now go to the building’s main electrical panel, locate the breaker switch for the lighting circuit you are working on, and switch it off.Leave the black probe on neutral and move the red probe to the “other” wire going into the switch you will get a reading of approximately 120v when electricity is supplied to that circuit. Put the black multimeter probe tip on the switch’s neutral wire terminal and the red probe on the ground wire terminal there should be 0v (voltage) displayed. ![]() ![]()
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