Re: Redundancy
I would typically think you misunderstood something about the electrics (wiring up two feeds in parallell would either cause nothing, if they were in phase, or a short, if they were out of phase), but I'm not familiar with the UK system.
Is this 240V single (phase+neutral), two (two phases with 240V average difference) or three phase (where the voltage between phases would be higher but give 240V to neutral) ?
In all scenarios except the two phase one, overvoltage could also be caused by losing the neutral wire.
In the two-phase scenario I guess you could somehow end up with two phases with more than 240V difference.
Otherwise I'd think it was a short voltage spike or similar.
Biting the hand that feeds IT
