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Maximum Demand / ENA / EV Help!

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 :)
Parents
  • Having Googled the question, I see the problem. If it is maximum demand, there is possibly a problem; but if it is after diversity maximum demand, possibly not.


    On the face of it, you have a problem because you have revealed your intention to install an EVCP, rather than just doing it. Good for you!


    I think that you need to clarify with the DNO whether they want to know your peak maximum demand or ADMD.


    Quite how you work out ADMD is for those in here who are cleverer than I. Even if you have an ADMD of 18 kVA, if that is your average consumption, the leccy bill will be eye-watering.
Reply
  • Having Googled the question, I see the problem. If it is maximum demand, there is possibly a problem; but if it is after diversity maximum demand, possibly not.


    On the face of it, you have a problem because you have revealed your intention to install an EVCP, rather than just doing it. Good for you!


    I think that you need to clarify with the DNO whether they want to know your peak maximum demand or ADMD.


    Quite how you work out ADMD is for those in here who are cleverer than I. Even if you have an ADMD of 18 kVA, if that is your average consumption, the leccy bill will be eye-watering.
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