White Wire

Why is the cast iron pipe working as a white wire to turn my light on?

There is a cast iron pipe (gray) coming out of the ceiling. If I touch it with the white leg while the black leg of a light bulb is attached to the hot black wire the light will turn on. Then I disconnect everything and test the pipe with a voltage tester and it beeps as I touch the pipe so the voltage tester is accusing power on the pipe but I do not get a shock when I touch it. What is that?

Cast iron will conduct electricity and chances are your drain waste vent (DWV) system goes into the ground. To complete an electrical circuit, you need a path to ground, which the pipe that eventually goes into the earth satisfies the electric currents needs and completes the circuit.

If this is the way the light fixture is wired, it needs to be corrected.

Ryan White “Wire Beams”

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