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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!  Apologies, I misunderstood.  No mention of finely stranded conductors in description.  Need to school up on cable specs!!


    Immersion elements have M25 entry - https://processheatingservices.com/immersion-heaters/screwed-immersion-heaters/industrial-heaters-piirange/


    Elements are approx 30cm up off floor - They are facing into centre of room/work area, so could potentially be knocked IF a trolley was to be used or by a barrel being rolled around - So maybe SY or SWA for this?


    Sounds like HO7 (at £1.80/metre) may still be an option for Cable choice 1 - For main cable runs to power sockets and/or isolators around perimeter run via tray and/or clipped direct, all above 1m from ground?  Alternatively NYY (at £1.36/metre)?
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  • 0
    Thanks all!  Apologies, I misunderstood.  No mention of finely stranded conductors in description.  Need to school up on cable specs!!


    Immersion elements have M25 entry - https://processheatingservices.com/immersion-heaters/screwed-immersion-heaters/industrial-heaters-piirange/


    Elements are approx 30cm up off floor - They are facing into centre of room/work area, so could potentially be knocked IF a trolley was to be used or by a barrel being rolled around - So maybe SY or SWA for this?


    Sounds like HO7 (at £1.80/metre) may still be an option for Cable choice 1 - For main cable runs to power sockets and/or isolators around perimeter run via tray and/or clipped direct, all above 1m from ground?  Alternatively NYY (at £1.36/metre)?
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