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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
    In November 2019 I was thinking towards the future regarding EV charging and after some discussion on this forum, I asked our DNO (Scottish Power) regarding our ASC or Agreed Supply Capacity.
    Their answer was simple, "Please be advised that we do not hold capacity information. We as the distributor would be responsible for upgrading the supply if this is required.
    An electrician would be able to advise what you have at the moment and if you require an upgrade."

    Following a further inquiry where I advised that the cut-out fuse was 80 amp seen visually when I asked the meter fitter, they came back with,
    "We only hold records for half hourly supplies. In order to assess what is in the property we would recommend applying for an additional load so that we can carry out a network study and advise you on the current capacity."

    I never pursued my enquiry, but if I did, do DNOs normally charge for that network study? If all it needs is a fuse to give a 100 amp supply, what is a typical cost?
    I'm thinking here of it likely being first come, first served until the capacity runs out...

    Clive
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  • 0
    In November 2019 I was thinking towards the future regarding EV charging and after some discussion on this forum, I asked our DNO (Scottish Power) regarding our ASC or Agreed Supply Capacity.
    Their answer was simple, "Please be advised that we do not hold capacity information. We as the distributor would be responsible for upgrading the supply if this is required.
    An electrician would be able to advise what you have at the moment and if you require an upgrade."

    Following a further inquiry where I advised that the cut-out fuse was 80 amp seen visually when I asked the meter fitter, they came back with,
    "We only hold records for half hourly supplies. In order to assess what is in the property we would recommend applying for an additional load so that we can carry out a network study and advise you on the current capacity."

    I never pursued my enquiry, but if I did, do DNOs normally charge for that network study? If all it needs is a fuse to give a 100 amp supply, what is a typical cost?
    I'm thinking here of it likely being first come, first served until the capacity runs out...

    Clive
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