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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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  • Former Community Member
    0 Former Community Member
    D4G:

    Agreed but I still need to put a number on the form though??


    Can you not get them to actually clarify what fuse is in there first, ie is it already 100amps, if not get it up rated to 100amps, then a decent ev charger as already stated with load curtailment feature and put the EV to charge later in the evening ie between maybe 21:00 - 04:00, this would still give plenty of time ie 7 hours if battery needed a long charge, and chances are they will not be using much load from the rest of the house. 


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  • Former Community Member
    0 Former Community Member
    D4G:

    Agreed but I still need to put a number on the form though??


    Can you not get them to actually clarify what fuse is in there first, ie is it already 100amps, if not get it up rated to 100amps, then a decent ev charger as already stated with load curtailment feature and put the EV to charge later in the evening ie between maybe 21:00 - 04:00, this would still give plenty of time ie 7 hours if battery needed a long charge, and chances are they will not be using much load from the rest of the house. 


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