Determining whether a residential 3-way or single-pole light switch has been wired correctly involves verifying both physical terminal connections and operational behavior. First, always ensure safety by shutting off the circuit breaker and testing with a voltage tester before removing wall plates. Second, confirm that incoming power wires attach to the designated common terminal on 3-way switches, traveler wires connect to the brass traveler screws, and all bare copper ground wires are securely fastened to green grounding screws. You can troubleshoot switch wiring easily. You can verify that your wiring is correct when restoring power at the circuit breaker and toggling both switches independently turns the light fixture on and off smoothly from every location without tripping breakers or causing flickering.
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