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An interesting issue with a TT supply

Alan Capon over 3 years ago

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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0 Former Community Member over 3 years ago

I know of at least one 3-phase transformer up a single pole. Rated at 50 kVA.

I believe WPD will go up to 100 kVA on a "stout" pole Chris, not the GPO sized ones or age though!

315 kVA on a H pole. Just thought it should be plural for two but always spoken of an H pole. There we go again, a or an before H here?

Regards

BOD
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0 Former Community Member over 3 years ago

I know of at least one 3-phase transformer up a single pole. Rated at 50 kVA.

I believe WPD will go up to 100 kVA on a "stout" pole Chris, not the GPO sized ones or age though!

315 kVA on a H pole. Just thought it should be plural for two but always spoken of an H pole. There we go again, a or an before H here?

Regards

BOD
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