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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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  • I fear  that having just about got a lid on the can of worms, it all gets complex again if you do this.

    chargers to retrofit to lamp posts   I bet they are not going round converting all the lamp posts to be TT earthed.


    I also fear that while you may do one or two per street, the vision of one on every lamp post overlooks a problem of loading.
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  • I fear  that having just about got a lid on the can of worms, it all gets complex again if you do this.

    chargers to retrofit to lamp posts   I bet they are not going round converting all the lamp posts to be TT earthed.


    I also fear that while you may do one or two per street, the vision of one on every lamp post overlooks a problem of loading.
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