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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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  • 0
    Thanks all!


    On a side note.  Would you say that it would be suitable to use un-armoured cable for these radials?  I am intending to run cable tray all around the building, then clip direct for the run down from the cable tray to the sockets, enclosures or junction boxes...  Was wondering if I can get away with using NYY or N2XH instead of SWA?
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  • 0
    Thanks all!


    On a side note.  Would you say that it would be suitable to use un-armoured cable for these radials?  I am intending to run cable tray all around the building, then clip direct for the run down from the cable tray to the sockets, enclosures or junction boxes...  Was wondering if I can get away with using NYY or N2XH instead of SWA?
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