Bonding steel framing

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Old 11-02-16, 07:34 AM
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Bonding steel framing

Hello all

I'm currently starting on framing basement. Using steel studs and track system. Looking forward to next project electrical rough in and what types of boxes for steel framing. I want very much to use plastic boxes vs 4x4 metal with mud ring due to cost. Plastic being 4 times less per box. Now I understand it's not code however I have read a lot about framing potentially becoming energized due to arcing. Most suggest although not code it's a good idea to bond the framing. Can anyone give detailed info on how to do this. I cannot find anything on this topic. Thanks in advance.
 

Last edited by Hawkdriver; 11-02-16 at 07:36 AM. Reason: Typo
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Old 11-02-16, 09:11 AM
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Bonding could be accomplished just by drilling a hole through the steel, putting a nut and bolt through and crimping a ring terminal on a bonding wire. However, I do not believe it is necessary to bond steel studs because they are not likely to become energized (you did use bushings when pulling cable) and they are also not exposed to human contact once the wall is finished.

The problem with using plastic boxes is that you cannot securely fasten them to the steel stud with the standard angled nails. I suppose you could try replacing the nails with long Tek screws and give that a shot. If you find plastic boxes with integral screw mounts you can use them on the steel studs, however this essentially offsets the cost savings. Otherwise, use metal boxes. You don't have to use 4x4 boxes with rings. You can just use standard metal gang boxes with integral NM clamps.
 
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Old 11-02-16, 10:04 AM
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Carlon or Cantex make plastic boxes that can be used easily on metal studs.
One has adjustable depth settings.

1-Gang 21 cu. in. Non-Metallic Wall Box with Adjustable Bracket-B121ADJ-40R
1-Gang 18 cu. in. PVC New Work Outlet Box with Bracket
 
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Old 11-02-16, 06:28 PM
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Using metal boxes and mud rings will also ground the metal studs. You will ground the box to your cable, the grounded box is screwed to the metal studs, and the studs are screwed to the track.

BTW a 4x4" steel box is $1.10 USD + the cost of the mudring. PJ's first box he linked is $2.32. You do the math.
 
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Old 11-02-16, 08:34 PM
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A tad more if you look at the 1900's with the metal stud bracket.

BUT.... the metal boxes definitely are not 4x more expensive.
 
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Old 11-03-16, 05:19 PM
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Old 11-03-16, 09:21 PM
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That is really strange. I was just in Depot and the price on that exact box was much higher.
Now I'll have to look again.
 
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