Plastic grommets needed with MC Cable?

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georgestolz said:
Down in Florida, they've started requiring steel studs to be bonded (through connection to metallic outlet boxes and so forth) after a worker was electrocuted by a doorjamb.
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New to me?:-?

I have used them in metal studs before, not because of any code or inspector, but it does make it easier to pull MC through the studs
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I just use them to eliminate the annoying noise it makes while pulling.:)
 
lpelectric said:
Would self-tapping screws of an adequate length provide a thorough connection? I would think they would. So they would be thoroughly connecting a box to a metal stud. The box would be thoroughly connected to the equipment grounding conductor. This would provide a continuous metallic path which would be electrically conductive. These thorough connections would in turn ensure electrical continuity, so that if a fault were to occur at a metal stud, somehow, this system would have the capacity to safely conduct such a fault. :smile:
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I guess I was thinking of 250.8, but that is for conductors.
 
DAWGS said:
How would metal boxes be an approved method of bonding to metal studs when your using self taps to mount them?
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What if you don't even use a screw at all?
sc_1_04370_ph_44.jpg

151MS13
Steel City? Indoor Boxes & Covers
Square Box with Pre-Installed 10 1/2" Pigtail, 1/2" Raised Single Device Cover with 'MS' bracket. Box, cover and bracket material-Steel. 4" square box, 1 1/2" Deep, 21 cuin.
 
celtic said:
What if you don't even use a screw at all?
sc_1_04370_ph_44.jpg

151MS13
Steel City? Indoor Boxes & Covers
Square Box with Pre-Installed 10 1/2" Pigtail, 1/2" Raised Single Device Cover with 'MS' bracket. Box, cover and bracket material-Steel. 4" square box, 1 1/2" Deep, 21 cuin.
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Nope. you gotta screw it to the stud. Just be happy sheet metal screw are allowed.
 
Cavie said:
Nope. you gotta screw it to the stud. Just be happy sheet metal screw are allowed.
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No I don't ...

By using the “MS” bracket box, the unit has the stud mounting as an integral part and no further parts are needed.
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No Tools/ No Screws Required. Just the installer hands are required for the “MS” box to be installed.
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http://tnblnx3.tnb.com/emAlbum/albums//sc_us/sc_1_g_msproductinfo_lr.pdf

Skip on down to: II. Metal Stud Installation Overview


EDIT TO ADD:
Then skip on down to page 10/11 for the "To whom it may concern" letter.
 
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I think that Cavie was trying to link to this thread or another like it that touched on the Florida steel stud bonding issue.

I could have swore there was an energized doorjamb in the story, but I was wrong - it was a dryer.
 
celtic said:
No I don't ...

http://tnblnx3.tnb.com/emAlbum/albums//sc_us/sc_1_g_msproductinfo_lr.pdf

Skip on down to: II. Metal Stud Installation Overview


EDIT TO ADD:
Then skip on down to page 10/11 for the "To whom it may concern" letter.
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That info was printed BEFOR the stud bonding requirement. I don't think it will pass muster as a bonding device. I know it won't in my town. Think about it. Nec requires a threaded bonding screw in that very box. Then they are going to allow a no physical connection to the stud. I think not.
 
The box HAS a threaded hole for the EGC....just like any 1900/4S. (see big photos on page 2/11)

How Fl. will handle bonding metal studs - well, that's Fl.'s problem, not the manufac. :D

IMHO, the "jaws" on these boxes are as - if not more effective - than PKs/self tapping screws.
 
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