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Ah, yes, I see that now. So a switchfuse would be expected to go between the mains feed and the 63A RCD (the small CU in the garage) as over-current protection? This is a self contained circuit which runs: Mains > 2 way CU (63A RCD, 16A and 32A MCB) > loop on 32A MCB to boiler house for...

Thank you for that :-) So if it is a 63A fuse, and a 100A switch, it should blow the fuse before it trips the switch? What does the switch do then?

A switch-fuse or a fused switch, or are they the same thing? (as they seem to be £20 or £80) http://www.tlc-direct.co.uk/Main_Index/Distribution_and_Switchgear_Index/Switchfuse_SP_and_N/ There is no feed in the boiler room, just a loop on the filter pump circuit for the timer. What does...

Curious how that works... You talking about connecting the (25mm) meter tails to a (100A?) switchfuse at the source end, then 10mm SWA out to the garage where it connects to a CU? Can you run from 100A down a 10mm SWA?

Heh heh, 13,000 gallons worth. ;-) Actually, looking at that diagram, it needs to be 25mm SWA to export main s to the other end, doesn't it?

A rough diagram of the layout.

Ok, this should be the rough layout of what I am proposing the electrician does. Compare that with the photo of the board below: You can see the old fusebox that will be removed, the existing Henley with 3 (currently) tails out going to main home CU, fusebox and (new 16mm) tails to...

1974. Currently no RCDs anywhere. The intention is to introduce two RCD protected circuits for this outbuilding only, at this stage. Yes, that's just part of the existing lighting circuit within the outbuilding. I just took the cover off to check the wiring. 'In, out, lamp switch' No...

Right, managed to fix that little issue (the original wiring had a crossed wire, God only knows how it worked before!) but we seem to have at least one dead wire in the original SWA, and it currently terminates in the shower room anyway which seems a pretty daft place for it to finish up, so...

Ah, anything in the garage is just what I have inherited - I haven't touched any of that!

See if this helps any... Main supply in garage. Mains incoming on right, marked dual supply. Main RCD for house along top. Outbuilding fuse box bottom left. (Third feed running off to right goes to solar panels). There are four fuses. One 30 amp goes to a separate circuit for a...

White 1.5mm on left is incoming supply. Grey is ongoing to next light. Right hand cable is switch, bottom is light.

Main incoming supply on right. Main RCD for house across top. Fuse box for outbuilding bottom left

Not changed. 4 incoming wires (red, blue, yellow, black). Red, blue and yellow go to each circuit in outbuilding. Common neutrals for each outbuilding connect together to black. Not checked inside fusebox, but presume each colour goes to one side of a fuse (5 amp, 15 amp, 30 amp) and the black...

Just taken out all wires, cleaned and reconnected. All connections seem tight. ... same problem.

By MCB I mean fuse box. I can run drill without affecting lamps. Not sure what you mean by "If it's plastic"

1.5mm cable throughout. The incoming SEB mains supply feeds the main MCB for the house (RCD), and also a small separate MCB (plug in fuses) for this outbuilding (labelled dual supply). By recycling the main power I mean turning the MCB off and on for the outbuilding at the main switch on the...

Ok, setup was originally wired back in the late 1970s, so runs off an old fuse box rather than an RCD, but the fuses are all sound and working. Mains cable runs underground to a junction box. I haven't touched any of that. At the junction box is the one cable containing 4 incoming wires...

I have been working on a small outbuilding we have next to the house. It was a slightly enforced job, after the storm back in January took the roof off, and my wife said "while we are at it, why don't we..." It was constructed of two small rooms, a shower room and a pump room, each with its...