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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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    I'm not sure that 722 still explicitly says no diversity, but certainly there won't be much to be had between a relatively small number of constant power long duration loads.

    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????

    If you're supplying loads to total of 37kW loads you're probably not going to be using a single phase supply - a more likely arrangement would be a 3-phase supply with up to 2 single phase (32A) charge points on each - so a perhaps more manageable 64A/phase.

       - Andy.

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    I'm not sure that 722 still explicitly says no diversity, but certainly there won't be much to be had between a relatively small number of constant power long duration loads.

    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????

    If you're supplying loads to total of 37kW loads you're probably not going to be using a single phase supply - a more likely arrangement would be a 3-phase supply with up to 2 single phase (32A) charge points on each - so a perhaps more manageable 64A/phase.

       - Andy.

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