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Old 03-26-2011, 08:47 PM   #1
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Plastic box and "Madisons"


Hey:

Just wanted to make sure if it's OK to use "Madisons" to secure a plastic old work box. I can't get the clamps on the box to work behind our old plaster and wood lathe walls.

Thank you,
Ed

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Old 03-26-2011, 08:55 PM   #2
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Plastic box and "Madisons"


Why not screw thru the tabs at the top aand bottom of the box into the wood lathe? You can also turn the flipout wings around so they can grab the thicker wall surface.

Use can also use a old work box like the Smartbox that screws to the side of the stud.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.

Last edited by Jim Port; 03-26-2011 at 09:17 PM. Reason: spelling
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Old 03-26-2011, 08:57 PM   #3
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Plastic box and "Madisons"


This article may be helpful:
http://www.hammerzone.com/archives/e...thick_wall.htm
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Old 03-27-2011, 07:28 AM   #4
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Plastic box and "Madisons"


Yes Mad bars will work. They're available in two different "leg" lengths too, (obviously longer legs for thicker walls).
It can be tricky setting boxes into plaster-on-lath walls.
The lathes need to be cut right, (especially if they're spaced a little wide) or you end up not hitting any lath to support it. The most common mistake is cutting TWO lathes out, which usually ends up being too tall of an opening.
The correct way is to cut through one, and a little into the upper and lower ones.
Many times lathes aren't level or even the same heights around a room; which leads to the added outlets being different heights from the floor.

If it were my house, I would get the "Smartboxes" Jim Port suggested.
They contain held drywall screws on the inside, you just need to cut them in against a stud, they're great to work with, and are easily adjusted in and out.
BUT...you'll have to go to an electrical supply house to find them.
HD and Lowes only carry Carlon plastic boxes.

The metal boxes work best and the mounting ears can be adjusted or turned around if the plaster breaks away from behind them.
Good Luck
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Old 03-27-2011, 03:25 PM   #5
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Plastic box and "Madisons"


The problem is that it's someone else's work (previous owner). I have to use the hole that's there. I usually use metal boxes for any retro I do and I've had great luck with the Madison bars but the whole is bigger being a plastic box was there. There is no lathe to screw into, a real mess. I just didn't know if metal bars, not being grounded, would be some kind of violation.

Thank you.
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Old 03-28-2011, 05:35 AM   #6
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Plastic box and "Madisons"


What,
I came across this once on a job...someone had glued a block of wood to the outside sheathing...
Then they screwed their box to it...LOL ...it worked!
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Old 03-28-2011, 09:41 AM   #7
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Plastic box and "Madisons"


Quote:
Originally Posted by Do It Right View Post
If it were my house, I would get the "Smartboxes" Jim Port suggested.
They contain held drywall screws on the inside, you just need to cut them in against a stud, they're great to work with, and are easily adjusted in and out.
BUT...you'll have to go to an electrical supply house to find them.
HD and Lowes only carry Carlon plastic boxes.
Don't know where you are, but Menard's also has screw-in boxes (by Arlington I believe).

If you are close to a stud, you may be able to attach a block to the stud and screw into that without needing to cut a new hole.

RST

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