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Incoming cable, large power cut-out, multi fuseboard (basically large numbers of 100A fuses, one for each flat)n then either: - sub-main to each flat, cut-out unfused, meter or meter switch-fuse and private cable to flats. Something like these as the incomer...

So who thinks that only the live is disconnected on the upstairs circuit? Who also thinks there could be a L - E fault on that circuit that is causing the RCD to trip?

But! I'd be asking the builder why the cable had been left in that state, who cut it and the level of training for not leaving it in a safe state.

Generally the supply should/will be fused as close to the entry to the building as possibe, so the landlord may not be correct. Very much a choice for the DNO depending on the make and design of the cut-out they use regarding the colour and use of the fuse carrier.

What you seem to be referring to is a system where the DNO will have a central supply position where the fuses will be situated with sub-services to each flat with a cut-out in the flat fitted with a link. It was done this way to provide local isolation for, say, changing the meter!! So I...

Approved solar systems cannot generate AC voltage without a parallel with the AC mains. They will however continue to produce DC power on their outputs

Not forgetting the up to 7 times starting current if the motor is DOL. That might just put a hole in the transformer secondary volts

It's not a fire risk. Having two supplies in a building is a risk to the firefighters if there is a fire. I supect the cost of the alteration will be higher than suggested once it becomes clear that excavation will be required on the public footpath

Be cheaper to remove the supply than move! Talk to your DNO Industry definitions for what they are worth. Disconnect supply means to pull the cut-out fuse and take the meter away. Remove supply means the above plus cut the incoming cable clear of the property boundary

No, and some safety issues as I've commented on

We had something similar in the early days where some Building Inspectors (non electrically trained) decided that removing a CU that had been fitted to a DNO meter board and then refitting it when we changed the meter board was notifiable. (Plus the issue of the customer being left off supply if...

Assuming there is sufficient capacity available from the substation. You will probably require a new supply cable and termination. With that increase of load your metering will go from (probably) the existing type where the whole current is read by the meters to what is known as CT (current...

Different! Is the cable going/coming (?) from the upside down cut-out the same as one of those in the cut-out below the meters? (p.s. been on hols so late replies everywhere)

Yes it could be left with the meter removed and the main fuse also. However in the matter of fire safety it is not accepted to have 2 supplies into the same building where all areas are accessible as that is seen as a risk. But there is no "number of supplies" police nor will the supplier be...

Given that one of the faults they can't detect is a neutral earth cross, is this another source of incorrect indication?

Don't forget that as far as the DNOs are concerned the ELI at the cut-out for a TNCS system can be as high as 0.8. These figures were set many years ago by the DNOs

And of course if a problem occurs with, say, an overheating connection. The whole lot could catch fire as there is no means of quickly reducing load by switching CUs or main switches to off

You talk about the CU, where are the cut-out and meter?

Old cable pre 1970's with a plastic 60A cut-out so it has possibly been changed at some point

Yes that does happen I will grant you (forgot about these) but again they are not common. But answer this, should a core that may become live if a fault occurs be treated as live 100% of the time. Or would it be better to warn users that in some conditions it may become live?