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Radial Voltage Drop Calculation?... By Load or MCB Rating?

Nano Brewery
I'm doing the calculation for total voltage drop.  I have 14 radials/ways going out.  As I understand it, that would equal a max allowance of 0.285% voltage drop per radial/way.  Or some sort of mixture throughout not exceeding the 4% drop allowance overall.  Firstly, is this correct? 


Secondly, should I be doing my calculations based on actual Load or the MCB ratings of the individual radials/ways? 


Thanks in advance!
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    For example, BS EN 61851-1 for EV charging equipment specifies total - 10 % below nominal, i.e. 4 % in the installation in the UK, not 5 %

    Presumably 4% as 6% might already be lost in the distribution system (230V+10%-6%)


    That can't be good for our continental cousins where their incoming supply is I think 230V +6% -10% - so their 10% allowance has already gone and they'd have to achieve zero v.d. in the installation to comply.


       - Andy.
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  • 0
    For example, BS EN 61851-1 for EV charging equipment specifies total - 10 % below nominal, i.e. 4 % in the installation in the UK, not 5 %

    Presumably 4% as 6% might already be lost in the distribution system (230V+10%-6%)


    That can't be good for our continental cousins where their incoming supply is I think 230V +6% -10% - so their 10% allowance has already gone and they'd have to achieve zero v.d. in the installation to comply.


       - Andy.
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