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


    Isn't 2MVA a bit of an over estimated for 4 charging points 


    I responded to the concern that only 1% of the spaces had EV charging facility.


    If 50% were deemed an acceptable level and the expectation of a full charge on a 85 kWh pack in 2 hours suggests a 50 kVA charger at least, which in turn suggests 1 MVA.


    And that is on today's expectations when I would have thought that the infrastructure would have at least a 10 year expectation of meeting demand. If it only doubles in use, that's your 2 MVA.


    Factor in that there's already a 120 kW charge point near Tower Bridge, the discussion regarding low usage/city centre/demand etc takes a different angle.


    Regards


    BOD




    . all this talk of hundreds of public charging points being needed in car parks during the day, demanding masses of power at times of peak demand … really getting tedious..  for those that need to charge up, a trickle charge over the 8 hour work period would be adequate.. the other 90% like myself would have charged overnight, on cheap electricity, and waking up to a full tank that will suffice for a number of days.. I have had my EV for over a year.. times I have needed to use a public charger  … not once..  EV`s .. it`s not Armageddon.. just a slow slide into normality..    fossil fuel car production.. ok, thats Armageddon

    gary.. 




     

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  • 0

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


    Isn't 2MVA a bit of an over estimated for 4 charging points 


    I responded to the concern that only 1% of the spaces had EV charging facility.


    If 50% were deemed an acceptable level and the expectation of a full charge on a 85 kWh pack in 2 hours suggests a 50 kVA charger at least, which in turn suggests 1 MVA.


    And that is on today's expectations when I would have thought that the infrastructure would have at least a 10 year expectation of meeting demand. If it only doubles in use, that's your 2 MVA.


    Factor in that there's already a 120 kW charge point near Tower Bridge, the discussion regarding low usage/city centre/demand etc takes a different angle.


    Regards


    BOD




    . all this talk of hundreds of public charging points being needed in car parks during the day, demanding masses of power at times of peak demand … really getting tedious..  for those that need to charge up, a trickle charge over the 8 hour work period would be adequate.. the other 90% like myself would have charged overnight, on cheap electricity, and waking up to a full tank that will suffice for a number of days.. I have had my EV for over a year.. times I have needed to use a public charger  … not once..  EV`s .. it`s not Armageddon.. just a slow slide into normality..    fossil fuel car production.. ok, thats Armageddon

    gary.. 




     

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