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Contrary to common belief, AFDD’s do offer protection against arc faults in ring final circuits and to the equipment being fed from this circuit. A series arc fault in one leg however, is unlikely to be at a dangerous level so will not be detected. This is due to current in this instance flowing...

I'm sure there are some who can make sense of what I meant.

I think i read somewhere that they have made it a little more difficult to become part p registered, but don't quote me on it. What they should do is have a good clean up of the ones that are registered already

You can tell most of the time if an installation is going to be unsatisfactory within about 10 mins. The rest of the time spent is finding out how unsatisfactory it is.

Without seeing the EICR then It's hard to say, but if there were a few F1s etc then he would have been much worse off pleading not guilty.

Cant see a problem with the 1.5 mm feeding the fcu. Post locked to prevent being resurrected again

Trace where the contactor is switched on from first, as it could be from another location, and you may not be able to isolate at that rcd. As I think already said, too many scenarios it could be used for.

Unless it's a light bulb, lol

The first thing to do is IR test the supply cable from the 300ma rcd to the dis boards. Is there a TN earth at the cut out ? Is the cable 2 or 3 core ? swa ? Is there tails you can clamp around at the source of the 300ma rcd I'm assuming it's swa buried to the caravans then a post with earth...

He's going to spend money, even if he decides to have a go himself and buy a cheap mft and then learns how to use it.

I had this fault the other week 300ma time delayed sub main feeding a main building from there 100ma time delayed feeding 4 other buildings each having their own CUs all rcbo Kept randomly tripping the 300ma turned out that there was n to earth leak on the main swa cable and a n to earth fault...