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PME vs TT for charger

garywwess
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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    Concerning separation of different earthing systems: is it permissible to place an earth rod close to the DNO's service cable? I cannot see how they would interfere with each other except in the event of damage to the latter.



    It might depend on the type of the buried cable too - old PILC cables for example tend to have their metal sheath in fairly good contact with the soil (any original hessian oversheath typically having rotted away years ago). Older properties may well have PILC cables supplying them, even if the cable appearing at the cut-out is modern plastic sheathed, as DNOs have a habit of jointing onto existing cables just outside buildings.


      - Andy.
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    Concerning separation of different earthing systems: is it permissible to place an earth rod close to the DNO's service cable? I cannot see how they would interfere with each other except in the event of damage to the latter.



    It might depend on the type of the buried cable too - old PILC cables for example tend to have their metal sheath in fairly good contact with the soil (any original hessian oversheath typically having rotted away years ago). Older properties may well have PILC cables supplying them, even if the cable appearing at the cut-out is modern plastic sheathed, as DNOs have a habit of jointing onto existing cables just outside buildings.


      - Andy.
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