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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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  • 0
    well if the old cut out was 60 amps and has never blown, add on your 32A and ask for 92. If you ask for 81 or more they will fit a 100A fuse, which is what you want them to do.

    M.


    (do not worry the substation that supplies the street will be sized on something like 8 amps per house and they won't be changing it just for you.)
Reply
  • 0
    well if the old cut out was 60 amps and has never blown, add on your 32A and ask for 92. If you ask for 81 or more they will fit a 100A fuse, which is what you want them to do.

    M.


    (do not worry the substation that supplies the street will be sized on something like 8 amps per house and they won't be changing it just for you.)
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