Live/Neutrals reversed

[securespark]

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.

Didn't we have one on here a while ago where the fault was on one of the strappers of a two way lighting circuit and it took a while before someone worked out why the polarity appeared to be changing itself at will

Yup. That was one of mine!!