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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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    Cheers Broadgage!


    It is actually the first instance...  "the consumer unit may be very close to the orign which is generally accepted to be the power companies electricity meter."  ...as Scottish Power installed a new supply into the garage.
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    Cheers Broadgage!


    It is actually the first instance...  "the consumer unit may be very close to the orign which is generally accepted to be the power companies electricity meter."  ...as Scottish Power installed a new supply into the garage.
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