"avocado" wrote in message
ups.com...
I'm sure the suppliers main fuse would have blown on whichever phase
caused the problem. You say there were builders on site at the time -
sounds too much of a coincidence to me. Could it be that they shorted
two of the phases sending 415V down on of them?


Shorting 2 phase wires together would create one-helluva-bang, not 400+v at
the other end.

Tim.