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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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    ebee:

    Well, either a bespoke "loadshedder" type arrangement on the 4 heavy items (2 x showers, Cooker and Vehicle charger) or just the first three keep the charger as use anytime, might help. 

    of course, if using the priority units then you`d need 2 or three depending on how you want the priority to work out. 

    A word with the priority units manufacturers might give some help or if building your own then a knowledge of electronics or relay& contactor arrangements might be considered too


    I can hear the arguments now ?


    Personally if it was in my house then it would be likely that the shower and oven would be on at the same time, the car charging would be done over night.

    Like I say, there will be no issues as what I am adding is managed with a CT.

    The whole debate came from trying to work out what figure to put on the ENA form....


    Even if I disconnect the older shower, that leaves:

    36A shower

    17A cooker after diversity

    32A EV

    Theres 85A without a kettle, tumble dryer, lights .......


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  • 0
    ebee:

    Well, either a bespoke "loadshedder" type arrangement on the 4 heavy items (2 x showers, Cooker and Vehicle charger) or just the first three keep the charger as use anytime, might help. 

    of course, if using the priority units then you`d need 2 or three depending on how you want the priority to work out. 

    A word with the priority units manufacturers might give some help or if building your own then a knowledge of electronics or relay& contactor arrangements might be considered too


    I can hear the arguments now ?


    Personally if it was in my house then it would be likely that the shower and oven would be on at the same time, the car charging would be done over night.

    Like I say, there will be no issues as what I am adding is managed with a CT.

    The whole debate came from trying to work out what figure to put on the ENA form....


    Even if I disconnect the older shower, that leaves:

    36A shower

    17A cooker after diversity

    32A EV

    Theres 85A without a kettle, tumble dryer, lights .......


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