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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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    DG4, EVSE work is only a small part of what we do but the majority of EV installations are on the WCS side. I prefer to stay away from all things domestic but often it is unavoidable as the WCS client sometimes also wants a home charge facility and hence the need to process the grant application via EVHS. 

    Both grant schemes forbid upfront charging of the client so if you are doing say 10 in a month, you could be out £3.5K for 90 days. That is something that that the individual sparkie might be put off by but I am well used to public sector work where 90days might be considered quick! It’s not the money that puts me off, it’s the tedious hassle of the required grant documentation on the EVHS side that’s a killer for me.

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  • 0
    DG4, EVSE work is only a small part of what we do but the majority of EV installations are on the WCS side. I prefer to stay away from all things domestic but often it is unavoidable as the WCS client sometimes also wants a home charge facility and hence the need to process the grant application via EVHS. 

    Both grant schemes forbid upfront charging of the client so if you are doing say 10 in a month, you could be out £3.5K for 90 days. That is something that that the individual sparkie might be put off by but I am well used to public sector work where 90days might be considered quick! It’s not the money that puts me off, it’s the tedious hassle of the required grant documentation on the EVHS side that’s a killer for me.

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