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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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    Chris Pearson:

    . . . Interesting that the fault was found by coincidence!


    Also concerning that we have no idea how long it had been there! It does show the value of disconnecting the neutral or at least measuring it before you begin work. 


    Regards,


    Alan. 


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  • 0
    Chris Pearson:

    . . . Interesting that the fault was found by coincidence!


    Also concerning that we have no idea how long it had been there! It does show the value of disconnecting the neutral or at least measuring it before you begin work. 


    Regards,


    Alan. 


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