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#44514 - 11/05/04 06:03 PM Bx Casing
Sparks30 Offline
Member

Registered: 03/23/02
Posts: 125
Loc: Connecticut.usa
Can you use the casing of the BX for a ground? I have seen this done in old house, but I never thought it was legal. Thanks

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#44515 - 11/05/04 06:10 PM Re: Bx Casing
dmattox Offline
Member

Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
Don't think so, isnt that why they made MCC?

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#44516 - 11/05/04 06:22 PM Re: Bx Casing
Dave55 Offline
Member

Registered: 05/08/04
Posts: 666
Loc: Crystal Lake, Illinois, USA
To be a little technical the BX I use is Type AC. The casing is suplimented with an internal bonding strip. See Article 320.100 and 320.108. There's also a cross-reference in Article 250.118.

Dave

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#44517 - 11/05/04 07:37 PM Re: Bx Casing
ElectricAL Offline
Member

Registered: 10/10/01
Posts: 615
Loc: Minneapolis, MN USA
Sparks30,

Since you are thinking of installations of BX you've seen in old dwellings, the history of local ordinance as applied by the electrical Authority Having Jurisdiction since the dwelling was built is what determines whether a particular run of BX is allowed to be used as a ground.

The current NEC is for new installations, as a general rule. The NEC will have bearing on modification of existing wiring in sometimes strange ways.

In my area, old BX (without drain wire) is grandfathered in as a grounding means if the BX is apparently installed to the codes that were in effect at the original time of install. I can replace a two wire receptacle with a grounded receptacle. . .if, and this is a big if, the box volume calculates.

Many, but not all, times it is something else that drives the total replacement of the BX.
_________________________
Al Hildenbrand

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#44518 - 11/07/04 02:38 AM Re: Bx Casing
Sparks30 Offline
Member

Registered: 03/23/02
Posts: 125
Loc: Connecticut.usa
Thanks for the replys. Just wondering what other people think. Thanks again

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