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Maximum Demand / ENA / EV Help!

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 :)
Parents
  • If only if the whole problem were that simple. The DNOs appear to have given up and are probably waiting for the World to end. If all cars were replaced with Electric (Government Policy) the electricity supply will simply fail, become extremely unreliable for everyone, but not due to the DNO! There will be a lot of houses on each distribution cable in the street, and depending on the size a modest-sized fuse of 300, 400, or 600A. These blow fairly quickly at 50% overcurrent, depriving many houses of power, and it takes a significant time to get them changed. The same failure will then happen again, so the DNO will switch off half the "Smart meters" to prevent the fuse from blowing. This is the plan, and in time each circuit will be monitored and this turning off will become automatic! Now, what happens? Britain loses its 1st World status and turns into something like certain countries in Africa. Water supplies will become unreliable because pumps will be turned off, the same with drainage. Disease will increase. By now you all realise that this is an impossible situation. However, there does not seem to be an alternative plan with any possibility of it working. Today there are light winds and we are not getting many renewables. Why do Politicians not listen to Engineers?


    As to the answer to the original OP. I suggest you tell the people not to have a smart meter, and to carry on as long as they can. If the fuse blows, you wait a bit and get a new one fitted. It will not be that long before Amazon or Ebay will have solid links available! Then the disasters will really start, thank goodness for diversity.
Reply
  • If only if the whole problem were that simple. The DNOs appear to have given up and are probably waiting for the World to end. If all cars were replaced with Electric (Government Policy) the electricity supply will simply fail, become extremely unreliable for everyone, but not due to the DNO! There will be a lot of houses on each distribution cable in the street, and depending on the size a modest-sized fuse of 300, 400, or 600A. These blow fairly quickly at 50% overcurrent, depriving many houses of power, and it takes a significant time to get them changed. The same failure will then happen again, so the DNO will switch off half the "Smart meters" to prevent the fuse from blowing. This is the plan, and in time each circuit will be monitored and this turning off will become automatic! Now, what happens? Britain loses its 1st World status and turns into something like certain countries in Africa. Water supplies will become unreliable because pumps will be turned off, the same with drainage. Disease will increase. By now you all realise that this is an impossible situation. However, there does not seem to be an alternative plan with any possibility of it working. Today there are light winds and we are not getting many renewables. Why do Politicians not listen to Engineers?


    As to the answer to the original OP. I suggest you tell the people not to have a smart meter, and to carry on as long as they can. If the fuse blows, you wait a bit and get a new one fitted. It will not be that long before Amazon or Ebay will have solid links available! Then the disasters will really start, thank goodness for diversity.
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