wiring help

Old 09-29-04, 03:48 PM
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wiring help

I am installing a new light fixture on old wiring...I am supposed to connect black to black and white to white, but the old wires both look black...one is thicker than the other, though.
Which goes where?
Old 09-29-04, 04:14 PM
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You really can't extend an ungrounded circuit.

However, I will try to answer your question. Both conductors of the old circuit should be the same size. For a time the ground wire on residential branch circuits was allowed to be smaller than the current carrying conductors. Are you perhaps comparing the ground with one of the current carrying conductors?

Both current carrying wires should be insulated. One with black, the other with white. The white tends to darken over time.

Use a tester to determine which of the insulated wires is 120 volts and which is grounded.

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