My son's doorbell isn't working, I'm not getting any voltage, and I traced the wiring to the transformer located in the basement behind a finished ceiling used for a light fixture. I would like to relocate the new transformer in a nearby unfinished part of the basement. (How did they attach the transformer to the back or side of that blue plastic outlet box?)

I found a couple of 1-gang outlets but they are in blue plastic boxes. like this one

My new transformer is the type with a screw on connector for attaching to one of the holes in a junction box but I don't see any way of doing that to this type of box. Is there a trick to this? Or do I need to install a different box next to it and run power there?

1 Answer 1


As I Understand It:

  • To do it wrong, you simply drill a hole in the box, which is presumably what was done.
  • To do it right you need a box with a knockout for a hole, which will normally be a steel box.
  • No, a hole was not drilled in the original box.
    – Rob
    Jan 18, 2020 at 23:59
  • Then perhaps it's not attached at all...
    – Ecnerwal
    Jan 19, 2020 at 0:04
  • 1
    If you want a plastic box with KOs, those do exist -- look for boxes made for use with ENT (aka smurf tube). Jan 19, 2020 at 0:45

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