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Dec 10 at 2:10 comment added Harper - Reinstate Monica @tangent360 metal boxes have knockouts. It IS for a safety/code reason, plastic boxes lose too much strength when you knock unintended holes in them. Also, most knockout-mount transformers depend on the metal box for grounding so now you'll need an RMC grounding bushing or something equally messy. Note AC transformer allowed, so any common $13 doorbell transformer is fine, you don't need an exotic power supply.
Dec 8 at 11:53 comment added crip659 @tangent360 Metal box is just easier. I do not know if it is in code to modify/drill a knockout hole in the plastic box, but if it is and you can do it, it should be good. If you have the proper tool it makes life easier, but most people would have to buy one. A search for door bell transformer will show a lot.
Dec 8 at 3:22 comment added tangent360 Are you suggesting metal box because metal boxes have knockouts? or you think it also needs to be metal for some safety/code reason? I can drill a 'knockout' into the HV/LV divider of the box ... I have a very low profile right-angled drill attachment and bit for doing exactly this. And then if I could get the right device in a knockout mountable format it would be an ideal solution. But still have to find the right power supply. Thinking something like this or with that profile and mounting style.
Dec 8 at 1:37 history edited crip659 CC BY-SA 4.0
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Dec 8 at 0:40 history answered crip659 CC BY-SA 4.0