Power loss

[SUNRAY]

Yesterday a customer lost all power. At the time they were having 2 showers using instant heaters and a selection of small loads: TV, lights, Christmas lights router etc.

DNO fuse marked as 60A and a B63 MCB feeding T&E to Henley then CU and second T&E to granny annex.

Apparently they didn't know there was a main MCB in the meter box fitted over a decade ago as it's never tripped before but it's there on the paperwork. Also on the paperwork is the EV charge point added to the Henley 2 years ago.

And this seems to be the first on a looped supply.

 

[ericmark]

I do wonder with my own house, 60 amp DNO fuse, and two showers, also granny flat with second shower. I can see why a 60 amp fuse, the isolator in the old Wylex unit only rated 60 amps.

 

[SUNRAY]

I do wonder with my own house, 60 amp DNO fuse, and two showers, also granny flat with second shower. I can see why a 60 amp fuse, the isolator in the old Wylex unit only rated 60 amps.

The story is the DNO kit was moved a little over 10 years ago, when the granny annex was built and coincident with both split load boards being fitted, so I wonder why it appears to be looped, the other properties seem to have indoor services.

 

[ericmark]

The garage was made into a granny flat well before we bought the house, I would think likely 15 years ago, from the date of central heating boiler. There was a plastic split load board feeding the flat, and a Wylex fuse box in the ceiling void. The surveyors home buyer's report said there was a disused fuse box in the loft space, but it was not disused.

We feel we got the house cheap, but the problem with leaking flat roof, and the central heating was a complete mess, so maybe other people's surveyors had done a better job?

Other than the showers, 60 amps would be ample, if I wanted a 100 amp supply I would need a 100 amp MCB or fuse feeding the consumer unit, as also have a 5 kW inverter, giving me an extra 22 amp.

I rewired the central heating, and the local heating guy admitted he could not have done it, at least he was honest, and the electrics were the least of my worries. I have wondered how long it would take to get a fuse replaced, with the same size, today unusual as cooking turkey crown, but even then 4 kW peak. Grid, a bit different as it shows charging battery but again well within 13.8kW (60A) I can see EV charging over night could be a problem, but until we get an EV can't see a problem.