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An interesting issue with a TT supply

Alan Capon
An interesting real life example of why you need double pole switching with a TT supply. The scenario is a small village with a few customers supplied by a single pole mounted transformer. 


We got a call from an electrician working in a property who had measured 400V phase to earth, 210V neutral to earth, and 241V phase to neutral, and was understandably worried. Any suggestions of what I tracked the fault down as? This can happen on any TT supply, but is fortunately very rare - I have come across it three times in 20 years. 


Regards,


Alan.
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    I'd go for a simple but uncleared L-PE fault in a neighbouring property that happened to be on a different phase. Either no or faulty RCD and the faulty installation happened to have a significantly better connection to true earth than the Tx.

      - Andy.
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    I'd go for a simple but uncleared L-PE fault in a neighbouring property that happened to be on a different phase. Either no or faulty RCD and the faulty installation happened to have a significantly better connection to true earth than the Tx.

      - Andy.
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