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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
  • When changing a circuit to down lights, if a joint is required for the mains etc , even if it's an MF one i try to get the joint so that it can be pulled through one of the down light holes. There's no searching for it then if you note it on your paperwork.

    Gary

  • 526.3. Are we allowed to use "maintenance free" junction boxes that float in mid air or sit on glass fibre loft insulation?

    B.S. 5733 equipment?

    526.3 (vi).

    Z.

Reply
  • 526.3. Are we allowed to use "maintenance free" junction boxes that float in mid air or sit on glass fibre loft insulation?

    B.S. 5733 equipment?

    526.3 (vi).

    Z.

Children
  • I don't see a problem. It's better that it's accessible than not. It would generally be below the insulation if pushed back up through a down light hole. 

    Gary