Not sure if this is right place to post but, HEEEEEELP!!!

R.Robertson · Dec 9, 2011

I just passed 17th edition as most jobs I'm looking at require it, took me 5 weeks to do all courses, thing is the misses dad found out and asked me to have a butchers at his consumer unit because it was stinking, I had a look and the consumer unit and it was fine as I dutifully done all the testing, I then followed supply cable back and there is a supply isolator switch rated at 43A for the enclosure and 30A rewireable fuse and it's basically burnt through the Bakelite and the insulation of the cable, what may have caused it? The fuse hadn't blown and the MBC hadn't gone either, also shouldn't RCD protection switch to OFF when power goes off?

If this is in wrong place, sorry and could you redirect me pleeeease?

needasparks · Dec 9, 2011

Are you sure it is not a supply to the cooker or shower ? As it sounds like a 30a radial feeding something like that. It would be dark brown or cream coloured one way cu by the sound of it. try and post a picture for us to see.

R.Robertson · Dec 9, 2011

No, think he had a cowboy in to do it, swa comes in and goes to isolator, isolator is below the CU and goes straight into the feed could it just not be man enough? I could put pic up if I could work out how

R.Robertson · Dec 9, 2011

R.Robertson · Dec 9, 2011

There is a pic but it's got to be moderated or something

needasparks · Dec 9, 2011

It sounds like a loose cable is cooking up its terminal and will only get worse if left. Is this an out going circuit in addition to the consumer unit or is this between the meter and the main consumer unit ?

R.Robertson · Dec 9, 2011

Between the meter and the consumer unit, but it's only got a 30A rewireable in it, and I kid you not he runs loads off it. I can't believe it all runs from one fuse, it's a double split board and runs three floors including plug in halogen heaters and 7 workstations

needasparks · Dec 9, 2011

sounds a strange thing to have even on an older install. What size cables feed it and then go on to feed the board ?
Is this commercial or domestic ?

R.Robertson · Dec 9, 2011

Quasi domesticate it's an office next to his house, cable size is 16mm swa in and 16mm T+E out. Comes from meter, through a isolator switch beside meter, underground in swa and pops up into another isolator (the burned out one) inside the office, from there it's a 3ft run into the consumer unit.