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Reverse Polarity

bakey1959

Has anyone encountered a reverse polarity single phase PME supply to a house? If so, how did it happen and how was it detected?

I am intrigued to how you would discover it by measuring L-N, L-E, and N-E at the incoming side of the Main Switch, as the Earthing conductor would be connected to the Line at the cut-out and give 0V, the same as if it were correctly wired and you were measuring N-E?

I cannot get my head around how you would detect the issue.... maybe I will set it up on an empty standalone C/U and see what I get?

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    I wonder how well the single pole/non-contact voltage indicators would work in an installation  where main bonding connected the metallic structure of the building to the supply L (normally PEN, but reversed). If I understand correctly, they use stray capacitance between the user and the rest of the world to complete the circuit - but if the surrounding world is at 230V rather than 0V wouldn't we be back in the same situation as for conventional 2-pole testers?

       - Andy.

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    I wonder how well the single pole/non-contact voltage indicators would work in an installation  where main bonding connected the metallic structure of the building to the supply L (normally PEN, but reversed). If I understand correctly, they use stray capacitance between the user and the rest of the world to complete the circuit - but if the surrounding world is at 230V rather than 0V wouldn't we be back in the same situation as for conventional 2-pole testers?

       - Andy.

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