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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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    perspicacious:
    There are 4 charging points! Infrastructure requirements should have been, by now, solidly embedded in building regulations and planning.


    And how much would your area DNO charge to supply 2 MVA or more? What % of the build cost would this be?




    Why 2MVA? That's 5 kVA or 20-odd amps per car for every single one of them.


    I agree that 4 charging points are inadequate - it suggests no more than tokenism.


    400 places multi-storey. Let's say 4 floors of 100 bays each. Make one floor electric. If the average journey is 10 miles (home to shopping centre) and the average stay is 2 hours, and an economical car does 5 miles per kWh, only 1 kW per bay is required to replenish the batteries for the journey to the shops. So now we are down to a supply of 100 kVA, which is much more realistic. If you want to make provision for the journey home, that's still only 200 kVA.


    Or put another way, diversity needs to be applied!


    Most of the time, most peoples' cars are idle. That's usually 8 hours per day at work, and 8 hours per day at night. We are used to putting in loads of fuel in one go - I fill up about 30 times per year. With electric, we will need to get used to little and often.

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    perspicacious:
    There are 4 charging points! Infrastructure requirements should have been, by now, solidly embedded in building regulations and planning.


    And how much would your area DNO charge to supply 2 MVA or more? What % of the build cost would this be?




    Why 2MVA? That's 5 kVA or 20-odd amps per car for every single one of them.


    I agree that 4 charging points are inadequate - it suggests no more than tokenism.


    400 places multi-storey. Let's say 4 floors of 100 bays each. Make one floor electric. If the average journey is 10 miles (home to shopping centre) and the average stay is 2 hours, and an economical car does 5 miles per kWh, only 1 kW per bay is required to replenish the batteries for the journey to the shops. So now we are down to a supply of 100 kVA, which is much more realistic. If you want to make provision for the journey home, that's still only 200 kVA.


    Or put another way, diversity needs to be applied!


    Most of the time, most peoples' cars are idle. That's usually 8 hours per day at work, and 8 hours per day at night. We are used to putting in loads of fuel in one go - I fill up about 30 times per year. With electric, we will need to get used to little and often.

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