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Suburban filling station

lyledunn

This is a new site in a densely populated area. TT 400A TPN DNO supply. The site is pinned to earth by electrodes at various points, several along the wooden perimeter fence you see to the left.

The DNO Tx is immediately behind the metal fence. The whole surrounding area is PME. DNO would obviously not provide a PME terminal but given the proximity of other buildings, is it prudent to consider the site as TT?

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  • 0

    Some time ago I asked a question on this forum about installing a TT earth rod for a house adjacent to the DNO sub station supplying it, but I cannot find the discussion as I cannot master the search facility on this forum.

    I thought I was pretty good at using search engines, but I cannot get the search on this forum to work.

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  • 0

    Some time ago I asked a question on this forum about installing a TT earth rod for a house adjacent to the DNO sub station supplying it, but I cannot find the discussion as I cannot master the search facility on this forum.

    I thought I was pretty good at using search engines, but I cannot get the search on this forum to work.

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  • 0 in reply to Sparkingchip

    It's not just the location of the electrode itself that might be an issue for the DNO, but any buried metalwork connected to the TT system, to which potential may be transferred through the ground resulting from earth potential rise due to a fault on the HV system.

    If you want to make a hard and fast rule for this, then you'd be looking at 10 m or more separation, but in reality, if there's a global earthing system, or the DNO is happy that the ground potential rise and disconnection times are suitably low, then a lower (possibly much lower) separation distance may be acceptable.

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