I recently had my boiler serviced and the engineer recorded that my input 240v supply live/neutral lines are reversed.
The boiler is working ok so is there any reason to swap them round?
As phatboy pointed out at the start, it's not clear whether it is the DNO supply that has L/N reversed (in which case they obviously must be informed) or merely the supply to the boiler (or maybe the OP's entire installation, post meter).... Did he call the DNO?I recently had my boiler serviced and the engineer recorded that my input 240v supply live/neutral lines are reversed.
He certainly needs an electrician, to ascertain what (if anything) is wrong, and to get it remedied if necessary. However, I'm not quite sure how an 'earthing issue' could mainfest itself as an apparent L/N reversal.It could be an issue with the earthing, he needs an electrician to come and find the problem.
Ah, yes - I was thinking only of a single problem/fault/'issue'. If there is an L-E fault and the absence of an adequate earth/protective device combination, then, yes, I can see how it could appear as an L-N reversal. I was trying to think (without success) or how an 'earthing issue', alone, could manifest itself as a L-N reversal.It is seen more on TT supplies where there is no effective RCD protection, a L-E fault makes E at the same potential as L and shows up as L-N reversal. A disconnected E and downstream L-E fault will show the same too.
As I've just written, I agree that they should try to suss out what's going on before anyone contacts the DNO (who might well not be the ones who can sort it out, anyway. However, if they invested in a socket tester and got 'three greens' when plugged into sockets in the house, there would probably still be a need to get an electrician in to work out what the boiler man was worried about, so, IMO, they might as well get an electrician in to start with. ... and, of course, if the tester showed an apparent L-N reversal which was due to the sort of 'double issues' that Spark123 mentioned (or, indeed, due to the whole installation being 'reversed' at the CU), the DNO would not be the people who could sort it out, anyway - so another reason for getting an electrician first.Before anyone goes panicking to the DNO, surely the use of a £3.50 plug-in socket tester (NOT a neon screwdriver!!!) will give an better indication of whether the fault is simply a mis-wired FCU or something more serious! If three lights DON'T come on, there IS (potentially) a problem!
It is seen more on TT supplies where there is no effective RCD protection, a L-E fault makes E at the same potential as L and shows up as L-N reversal.
A disconnected E and downstream L-E fault will show the same too.
Needless to say, either case needs remedied quickly.
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