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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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    The document you cite Mike is slightly interesting but hopelessly badly informed.  If the Government is reading stuff like that it is not surprising they are upbeat about electric vehicles. Where I live most houses have 2 vehicles, some have 4 or 5. Many houses probably have maximum demands like the OP. Interestingly very few have charge points. I would be quite surprised if the local substation could handle another 250 kVA, even at night, and it feeds around 1000 houses. We shall see what happens, but given some of the recent news, I suspect we are heading for supply problems. I think that the next big shock will be the level of tax for electric vehicles once they become a significant proportion of vehicles. Interesting times ahead!
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  • 0
    The document you cite Mike is slightly interesting but hopelessly badly informed.  If the Government is reading stuff like that it is not surprising they are upbeat about electric vehicles. Where I live most houses have 2 vehicles, some have 4 or 5. Many houses probably have maximum demands like the OP. Interestingly very few have charge points. I would be quite surprised if the local substation could handle another 250 kVA, even at night, and it feeds around 1000 houses. We shall see what happens, but given some of the recent news, I suspect we are heading for supply problems. I think that the next big shock will be the level of tax for electric vehicles once they become a significant proportion of vehicles. Interesting times ahead!
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