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Maximum Demand / ENA / EV Help!

D4G
Hello all,


This evenings issue relates to an EV charger install.

The supply cut out is labelled 60/80 amp so I called the DNO and asked if this could be uprated to 100 amp.

They have sent me the ENA EV application form which asks for the Maximum Demand including the new equipment.

The problem I have is the existing circuits are:


32A - 7.2 kW shower 

40A - 8.2 kW shower

32A - Ring main

32A - 7.9 kw cooker

6A - lighting

6A - lighting

6A - security


Additional 32A for EV charger


So even with diversity I'm way over 100A, obviously in reality the diversity calculations are not appropriate as the client has never blown the cut out.

The smaller shower is not currently in use although they want to replace it for another one, I have told them this may not be possible.

The EV charger will have load management but I still need to put a figure on the ENA form....


Help appriciated :)
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  • 0
    Sparkingchip:

    There’s also an IET webinar available chaired by John Peckham with Mark Coles, Head of Technical Regulations at the IET and Graham Kenyon, Managing Director of G Kenyon Technology Ltd.

    https://electrical.theiet.org/bs-7671/faqs/webinar-questions-and-answers/electrical-diversity-and-load-curtailment-evc-webinar/




    Thanks for that link, a lot of questions re diversity. 

    The answer for the maximum demand question would be data logging however due to seasonal changes not really possible.

    The reality is it is a educated estimate, which will become more accurate with experience!


    Being as the EV charger has load curtailment I will be adding demand however not excessive.  Also I intend to disconnect the unused shower so removing a 32A circuit and adding a 32A circuit.


Reply
  • 0
    Sparkingchip:

    There’s also an IET webinar available chaired by John Peckham with Mark Coles, Head of Technical Regulations at the IET and Graham Kenyon, Managing Director of G Kenyon Technology Ltd.

    https://electrical.theiet.org/bs-7671/faqs/webinar-questions-and-answers/electrical-diversity-and-load-curtailment-evc-webinar/




    Thanks for that link, a lot of questions re diversity. 

    The answer for the maximum demand question would be data logging however due to seasonal changes not really possible.

    The reality is it is a educated estimate, which will become more accurate with experience!


    Being as the EV charger has load curtailment I will be adding demand however not excessive.  Also I intend to disconnect the unused shower so removing a 32A circuit and adding a 32A circuit.


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