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But for all we know, TT system with an RCBO, could have tripped on the L - E rather than short circuit

Very true, too many variables, you could do the same again right now and create a huge bang

Too many variables to give a definite answer but depends on your L - N impedance and L - E impedance What is your earthing type?

I would go with something similar to your drawing, except would centre over the bath, centre over window, and mirror, just from an aesthetic view personally as well as practical With downlights, it’s always a toss up between how does it look on the ceiling vs how does it light the room and...

Generally the service drops on open wire systems (as in your pic) are insulated but it’s more to prevent accidental contact from tree branches, etc and isn’t regarded in the same way as the insulation on say meter tails. Have you got a better pic of the cable coming down the wall? Cant tell from...

To save filling out the paperwork I would normally do this on an EIC just for the amount of work but 3 Mwcs is totally fine too. I see no reason if you are competent enough to fill out an Mwc, that you couldn’t fill out an EIC It is important to get it right though, I was once called upon after...

The problem is, if you don’t know what you are testing then you might as well not certify. The only thing with the test equipment you need to record on the certificate is the make, model and serial number. However, do you know what you should be testing, and what values you are looking for? And...

I wonder if the washing machine socket is fed from the fcu which the fuse was replaced in, when the washing machine got to the heating part of the cycle, this would blow the 3a fuse