Current in the white wires

Old 03-01-03, 06:31 AM
herb peirce
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I'm changing a ceiling light and i have three wires coming in to the box. The wireing is old copper with no ground. When i tested the wires for current with the switch off i have current coming back through the white wire. What might cause this and what should i do to trouble shoot?
Old 03-01-03, 06:56 AM
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We need more information.

How many wires of each color are in the ceiling? How were they connected? What test instrument did you use for your test, and how did you use it?

There is a lot of current in a white wire, and sometimes voltage too. There are a variety of circumstances, and we need the additional information to see which one applies to you.
Old 03-01-03, 07:33 AM
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IF there is an existing light there it should only have two wires connected to it. Use the same two wires on your new light.
White wire could have power because it is part of the switch leg.
Old 03-01-03, 10:04 AM
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It sounds like you tested the wire at the switch, in which case with the switch off the white wire should have power and the black wire should not. When the switch is turned on, you should have power to both the white and the black.

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