PVC or galavanized box?

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Old 09-10-19, 04:01 PM
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PVC or galavanized box?

I'm going to be pulling out an old 2-gang galvanized outlet box and replacing it with a 3-gang box. Some of the wires coming in and going out of the box are inside metalic conduit and with no ground wires. One of the wires going out of the box (to the bathroom heater/fan) is Romex non-metalic.
So should I buy one of these PVC boxes or find a galvanized box?
https://www.homedepot.com/p/Carlon-3...-100404028-_-N
 
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09-10-19, 06:13 PM
lambition
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I don't know what type of box you had before, but often gangable steel boxes are used instead of a single 2 gang or 3 gang boxes.

With gangable boxes, you take sides off of single gang box and attach another single gang box next to it.


When you attach NM cable to steel box, you screw ground wire to the box and the steel conduit and steel box acts as a ground conductor.
 
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Old 09-10-19, 05:01 PM
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The metal conduit IS the ground and as such needs to be maintained.
You're going to need to use a metal box.
Doesn't need to be galvanized..... just steel is ok.
 
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Old 09-10-19, 05:32 PM
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It's odd that Home Depot only sells 3 gang metal boxes in boxes of 10. Gonna have to be Lowes or Amazon I guess.
 
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Old 09-10-19, 06:13 PM
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I don't know what type of box you had before, but often gangable steel boxes are used instead of a single 2 gang or 3 gang boxes.

With gangable boxes, you take sides off of single gang box and attach another single gang box next to it.


When you attach NM cable to steel box, you screw ground wire to the box and the steel conduit and steel box acts as a ground conductor.
 
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Old 09-11-19, 12:19 AM
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The box in the link is all 1/2" ko's. You can get combination 1/2" ko and NM clamps.
You can connect any amount of these together.

3-1/2" deep gangable cut in gem boxes
 
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Old 09-11-19, 01:00 AM
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Will these 3-1/2" deep gangable cut in gem boxes screw on to the side of an existing metal box? If not I guess I would have to cut the mirror enough to give clearance for those plaster ears, yet at the same time not cut the drywall too much behind the mirror. That's a bit of a catch 22 because I need to be able to snap the mirror back after I score it. That's unless I can do the entire mirror cutting with a drill barrel and grinder blade, so that I don't have to snap any sections back towards the inside of the wall.
 
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