What an utterly stupid position to fit the main switch with the top so close to the top of the meter box, the outgoing tails then look a mess, that was probably the meter bodger fitter though. I don't suppose the Electrical Contractors have the initials CE by any chance ?
I've often used 16mm T&E Clips when running a pair of 16mm tails together, it can look really neat . but so many seem to go with 25mm tails as standard now.
I'd turn the bracket 90 degrees to be parallel with the centre of the lath that's visible - although it could be better to spread the weight across two. I hope the OP gets it after all this , thank god there aren't 3 or 4 cables present. :)
I suspect the RCD may be the main switch and he's taken the possibly faulty circuit out of an MCB and straight into the outgoing side of the RCD to try and 'fix' a problem...
I'm afraid you're not quite getting it, just screw through the ceiling into the wood, the screw will make the hole as you turn it with a little bit of pressure. if the bracket isn't on the ceiling surface but behind it it would be impossible to fix the light to the bracket.
You fit the bracket on the ceiling NEXT to the hole, the bracket is then on the ceiling and when the fitting is connected the base covers the hole when fixed to the bracket.
It really couldn't be simpler, position the bracket with the middle in line with the cable hole but offset so that the fixing holes are under the centre of the visible wood and screw it up until tight and secure. The screws themselves will cut through the plaster as you drive them up into the...
The other thing that surprised me when I started the job was T&E being the cable of choice for the circuit , I just assumed it would be flex ? 1.5mm for columns up to 6 metre and 2.5 for anything above for 'mechanical strength'.
The incoming supply is a DNO one although often looped from the incoming side of the cutout between the lights along a road. So each supply point is effectively the source mate.
It would be a 10mm straight from the link in the DNO cutout [smaller than a domestic setup] to a large brass bolt on the inside of the column. This is the installation MET so the CPC of the cable feeding the lantern/s would also connect to this with an appropriate lug, I always thought it a bit...
I used to work as an Electrical Inspector for my local Council, mostly overseeing a large street lighting maintenance contract. The vast majority of streetlighting is supplied via DNO supplies here and were all PME/ TNCS. But a 10mm main bonding conductor was always connected to the MET bolt...
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