Wiring mismatch?


Old 08-20-05, 07:39 PM
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Wiring mismatch?

Hello, I'm trying to wire a new exhaust fan/light in my bathroom. Two switches.. I will also need to keep a third switch for a lighted mirror. Question is, I have metal wrapped, 2 wire power coming in but the schematics of the fan/light show 4 wires coming in to the unit. The wires are ground/white/black and red. I imagine the connections can be made but, does it matter if instead of metal sheathed wiring I use Non-Metal cable to come out to the fan/light? I was told the metal sheathing in the 2-wire cable is the ground. So, if the electrical box also has a green screw in it, can I connect the green NM wire to it and be safe?
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Old 08-21-05, 03:06 PM
Join Date: Aug 2005
Location: USA
Posts: 995
Sounds like you are describing BX cable. If so, then the outer armor is also the ground. It's not used around here anymore, in favor of MC cable, which has a green, insulated ground running inside with the conductors.

If Romex is allowed, and I assume it is, then there's no problem that I see. Run 14/3 between the switches and the fan to power the black and red wires separately.
Old 08-22-05, 02:31 AM
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Hi there. Thanks for the reply. Now...what is Romex? I found 12-3 metal cable. Picked it up 'cause it had the right number of wires. Can I use it?
Old 08-22-05, 03:52 AM
Join Date: Nov 2004
Location: USA
Posts: 1,959
"Romex" is a term commonly used for inside (NM or non-metallic sheathed) house wiring that is not armored.
Old 08-22-05, 05:29 PM
Join Date: Apr 2004
Location: Ontario Canada
Posts: 1,767
It depends on where you are. The 12/3 MC cable is fine.

Some jurisdictions(Chicagoland most famously) don't allow NMB, and perhaps limet use of metal clad "flex", favoring rigid conduit.

Don't forget the antishort bushings.

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