What is a common symptom of incorrect traveler wiring in a three-way switch system?

• A. The ground becomes energized
• B. The neutral turns hot
• C. The travelers are not connected
• D. The fixture hums

Answer: (C)

In a three-way switch setup, two traveler wires bridge the two switches so current can be routed from the power source to the fixture from either location. If that traveler wiring is incorrect or not connected, there’s no complete path through the switch loop, and the circuit can’t be closed properly no matter how you flip the switches. The most noticeable sign is that the travelers aren’t connected, leaving the path between switches open and the light not functioning as expected. Other symptoms like the ground becoming energized, the neutral turning hot, or the fixture humming point to different kinds of faults not specific to traveler wiring and indicate other electrical issues.