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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
  • If it is a rewire then N at the switch with as deep backbox as possible.

    If it is existing wiring the I like to use the Hager J501 with down-lights. Especially if there are going to be more than two cables e.g. feed-in, feed-out, switch, local load, load to next fitting. They are not MF but can be easily accessed by removing the down-light. They are also smaller then J503 and J504 so easier to fit.

Reply
  • If it is a rewire then N at the switch with as deep backbox as possible.

    If it is existing wiring the I like to use the Hager J501 with down-lights. Especially if there are going to be more than two cables e.g. feed-in, feed-out, switch, local load, load to next fitting. They are not MF but can be easily accessed by removing the down-light. They are also smaller then J503 and J504 so easier to fit.

Children
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