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Posted by Ted on June 10, 2008, 12:28 pm
I have already bought it, but am just curious.
HD had 4 different box connectors. Cheap ones for NM, BX, and BX/AC, and an
expensive one for MC.
The electrical clerk recommended the NM, but that didn't seem right. I was
tempted by the cheap BX clamps, but took the MC since I only needed two of
them anyhow.
Would code require the ones labeled MC, or would the BX have been adequate?
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Posted by RBM on June 10, 2008, 3:28 pm
>I have already bought it, but am just curious.
>
> HD had 4 different box connectors. Cheap ones for NM, BX, and BX/AC, and
> an expensive one for MC.
>
> The electrical clerk recommended the NM, but that didn't seem right. I was
> tempted by the cheap BX clamps, but took the MC since I only needed two of
> them anyhow.
>
> Would code require the ones labeled MC, or would the BX have been
> adequate? NEC requires MC connectors to be used with MC cable, BX
> connectors are not acceptable
>
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Posted by Doug Miller on June 10, 2008, 5:40 pm
wrote:
>I have already bought it, but am just curious.
>
>HD had 4 different box connectors. Cheap ones for NM, BX, and BX/AC, and an
>expensive one for MC.
>
>The electrical clerk recommended the NM, but that didn't seem right.
It wasn't. Generally speaking, advice from clerks in HD, Lowes, etc. is worth
exactly what you pay for it.
> I was
>tempted by the cheap BX clamps, but took the MC since I only needed two of
>them anyhow.
>
>Would code require the ones labeled MC,
Yes.
>or would the BX have been adequate?
No. If the BX clamps were adequate for use with MC, they'd be identified for
use with MC. They're not, so they aren't.
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Posted by Mikepier on June 10, 2008, 8:19 pm
The clamps marked NM is solely for romex, not BX, because if you
compare it to a BX clamp, there is a stop preventing the cable from
going through. This is necessary on BX so the anti-short bushing
(little red plastic at the end) will not fall out. If you use BX on an
NM clamp, the anti-short bushing can fall out
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Posted by on June 10, 2008, 11:34 pm
>I have already bought it, but am just curious.
>
>HD had 4 different box connectors. Cheap ones for NM, BX, and BX/AC, and an
>expensive one for MC.
>
>The electrical clerk recommended the NM, but that didn't seem right. I was
>tempted by the cheap BX clamps, but took the MC since I only needed two of
>them anyhow.
>
>Would code require the ones labeled MC, or would the BX have been adequate?
>
A true MC connector also provides the protection from the armor so you
don't need the anti-short bushing you need with type AC cable.
They still give you a few in a box of MC and I use them.
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