I have a metal encased electrical wire, I think its 14/3, how can I be
sure. I don't have the romex yellow (12 gauge) or white (14 gauge)
which makes it easy to determine. Is there data on the wires telling
me what gauge they are?
Compare it to a wire that you know is either 12 or 14.
Or use a wire stripper: if you put 12-gauge wire into the 14-gauge hole on a
stripper, the teeth will cut through the insulation, and bite on the
conductor. Conversely, the teeth on the 12-gauge hole will not cut all the way
through the insulation on a 14-gauge wire.
Doug Miller (alphageek at milmac dot com)
Metal encased in what? EMT conduit, BX, Greenfield, or ??????
You are much too vague. Did you try to read the wires themselves? In
Conduit they are usually labelled. Or put a micrometer on the copper
If you can trace them to a breaker, a 14 should be on a 15 amp. Of course
that's not conclusive since a 12 could be on a 15 amp or a 20 amp, but if
the work was done correct to start with, a 14 wouldn't be on 20 amp.
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