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Electrical Vehicle Chargers - No Diversity?

Apostolos

Good afternoon

I have a question to address to more experienced engineers in here about the load calculations around EVCs

Its clearly stated in BS7671 that no diversity should be applied to an EVC

This is a bit weird to me as to the ramifications it has

So, assuming we have a TPN 32A EVC, this means you cant apply diversity and feed it with a 20A MCB. It should always be a 32A MCB

All good

What happens in case you have a DB feeding 5 off these chargers?

Assuming you do not have a load management facility between the 5 chargers, does the 'no diversity' mean I have to assume a DB charged with 5 x 32 = 160A load????

And protect it with 160A, and install a cable for 160A etc etc etc?

Is this what no diversity means for the EVCs?

Always assuming you do not have a load management system installed in the EVCs

Thanks

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    Essentially you have got to the root problem of EV charging. There is simply not enough electricity to go round! Let's look one stage higher, a street. This has a high level of diversity applied already by the DNO installation, ie 5-10A per property. How would load management help at all when the street full of cars are all charged? The answer is it won't and so a lot of people are going to loose their supply, either by fuses blowing or smart meter switch off. In some places it is probably happening already, but the regulator and Government are remarkably quiet about it, I wonder why?

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    Essentially you have got to the root problem of EV charging. There is simply not enough electricity to go round! Let's look one stage higher, a street. This has a high level of diversity applied already by the DNO installation, ie 5-10A per property. How would load management help at all when the street full of cars are all charged? The answer is it won't and so a lot of people are going to loose their supply, either by fuses blowing or smart meter switch off. In some places it is probably happening already, but the regulator and Government are remarkably quiet about it, I wonder why?

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