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drewdin 12-24-2012 07:16 AM

connecting old BX cable to new romex wiring
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Hi Guys,

I am replacing some wiring, the wires are from the 50's, I believe its BX cabling. My problem is that the old wires are wrapped in cloth inside of flexible metal conduit without a ground.

The new wires of course are line, neutral and ground in a jacket. How can I get the ground from the new cable to connect to the old casing of the cable, do I even connect it?

I was thinking that I would get a metal gang box, connect the ground to the metal box and then connect the old cable to the box to keep the ground going, is that correct? Thanks

JoeD 12-24-2012 09:48 AM

If no ground present you are not permitted to extend or alter the circuit. It could be possible that the sheath is capable of being used as the ground.

drewdin 12-24-2012 10:04 AM

Thanks JoeD, that was my question. So if I use a metal box and connect the ground to the sheath I should be good.

nealtw 12-24-2012 01:28 PM

As long as the wrap is grounded somewhere!

Parrothead 12-25-2012 12:38 PM

FWIW, you can not use a plastic box with BX or MC cable. You must use a metal box with the proper fittings.

drewdin 12-27-2012 07:10 AM

@Parrothead I did replace the plastic box with BX and romex connector fittings. When I saw this I knew it wasn't correct, that's why I posted. Thanks for the help

drewdin 01-02-2013 12:01 PM

I was able to open the wall and replace all of the old BX/armored cable with new romex. So i ended up staying with the plastic box and cover, thanks for the help.

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