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PME vs TT for charger

Can someone please explain in common scence English (this has to be explained to a customer) .. why it is permissible for a street light , which in itself is basically a big metal earth rod buried 5 feet in the ground.. is allowed to be PME`d (customer used to install street lights) yet his charger has to be TT`d and isolated from the PME at all costs.. his parking space has a street lamp smack in the middle of it ??? I neither agree or disagree with the instructions to do so… just need something in writing to show the customer to prove im not just generating extra income needlessly..

Gary

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0 AJJewsbury over 6 years ago

PME'd street lighting has an additional electrode

Which begs a question - while this seems to be entirely acceptable good practice, required by many if not all DNOs (e.g. section 5.17 in http://library.ukpowernetworks.co.uk/library/asset/f6acd931-9c79-411f-a98f-f801bce6e63L/EDS+06-0017+Customer+LV+Installation+Earthing+Design.pdf) and presumably in line with BS 7430's recommendations, why doesn't the requirement for an additional electrode for street lighting appear in BS 7671 itself (presumably in section 714) - especially as the 18th DPC seemed very keen on the approach for PME installations in general. Anybody got any theories?

- Andy.
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0 AJJewsbury over 6 years ago

PME'd street lighting has an additional electrode

Which begs a question - while this seems to be entirely acceptable good practice, required by many if not all DNOs (e.g. section 5.17 in http://library.ukpowernetworks.co.uk/library/asset/f6acd931-9c79-411f-a98f-f801bce6e63L/EDS+06-0017+Customer+LV+Installation+Earthing+Design.pdf) and presumably in line with BS 7430's recommendations, why doesn't the requirement for an additional electrode for street lighting appear in BS 7671 itself (presumably in section 714) - especially as the 18th DPC seemed very keen on the approach for PME installations in general. Anybody got any theories?

- Andy.
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PME vs TT for charger

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