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Junction box depth

RustyH

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? 

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    A lot depends on the exact situation, but my usual order of preference is: 1) large central joint box somewhere out of the way but accessible ideally with a spare core or two to each switch/light point (best future-proofing option for later centralised lighting controls), 2) loop in at the switch (naturally gives a N at the switch in compliance with 559.5.1.208 and puts more the more difficult/crowded connections where they're most accessible), 3) loop in at the light - for downlighters etc using something that's accessible when the fitting is removed - I've used 'clickflow' connectors before with success - they feel a bit flimsy but provide a loop terminal, sufficient wiring space and an easy means of unplugging the light for testing & fault-finding.

       - Andy.

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  • 0

    A lot depends on the exact situation, but my usual order of preference is: 1) large central joint box somewhere out of the way but accessible ideally with a spare core or two to each switch/light point (best future-proofing option for later centralised lighting controls), 2) loop in at the switch (naturally gives a N at the switch in compliance with 559.5.1.208 and puts more the more difficult/crowded connections where they're most accessible), 3) loop in at the light - for downlighters etc using something that's accessible when the fitting is removed - I've used 'clickflow' connectors before with success - they feel a bit flimsy but provide a loop terminal, sufficient wiring space and an easy means of unplugging the light for testing & fault-finding.

       - Andy.

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