Largest Size Double Gang box

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Old 09-10-19, 08:17 PM
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Largest Size Double Gang box

What is the the largest size double gang box for old construction for switches/receptacles?
 
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Old 09-11-19, 12:09 AM
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Depends on metal or plastic but very close.

The metal box listed below is gang-able. You can connect two together for a two gang box.
Ultimately there will be slightly more working room in the plastic box.


Single gang 3-1/2" deep cut in gem. (18 cubic inch)
Two gang 34 cubic inch plastic box
 
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Old 09-11-19, 06:58 AM
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I need metal because the existing cable is the flex/metal-bx type. Just confirming that I can't use plastic with that type of cable? So basically the width is fairly consistent but I can increase the depth only?

I'm surprised no one makes bigger boxes. I've come across this problem many a time where there simply are two many cables in single or multi- gang boxes especially in older houses. You would think it's easy enough to design boxes that are wider - "step outward" as you go inward from the wall where they would be concealed and yet accommodate normal faceplates.
 
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Old 09-11-19, 08:52 AM
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There are larger boxes but they aren't considered old work.

You could use a deep 4" square box with a mud ring but that would require opening the wall.
 
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