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Junction box depth

Evening All, 

I typically wire lighting circuits with Hager JBs close. To the light switch drops, and I guess I have been lucky enough not to have come across thin loft joists before to ask this. 

I'm working on a house at the moment where the loft joists are thinner then I have seen, such they are equal to or slightly shorter than the Hager Junctions boxes I like to use, meaning the JBs would rest against the ceiling and protrude above the joist 

I can't point to a Reg that defines any requirements on this, so is that acceptable or would it be better to travel a few meters away from the switch drop to the joist binder beam that sits above the joists? 

Parents
  • I've seen this where the cieling joists are only thick enough to hold up the plasterboard. I think you are thinking that in future the home owner might want to board out the loft. I don't think they should even consider this without strengthening the joists and making them thicker to support the extra weight above, make this clear to them. So your boxes should be fine protruding above the existing.

Reply
  • I've seen this where the cieling joists are only thick enough to hold up the plasterboard. I think you are thinking that in future the home owner might want to board out the loft. I don't think they should even consider this without strengthening the joists and making them thicker to support the extra weight above, make this clear to them. So your boxes should be fine protruding above the existing.

Children
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