Hi there all, got a bit of a problem today, happily testing some flats when doing my earth loops on a small rcd protected CU with my newly purchased Robin Loop/PSC tester (with d-lock) fried the main rcd in the board. the board and rcd tested out fine before now its fried. it doesn't even trip with the test button now. we've tested out the installation and the tester is new and working fine, we have done 7 flats previous to this one and all checked out. thinking it maybe a faulty RCD we replaced and re tested and it did the same again, before i ship off my new testers to the robin hospital has this happened anyone bofore and what was the problem, is its something staring us straight in the face if it is you can give me an E-Slap and shake me but please give us a clue..
thanks.
thanks.