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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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    yes, OK if the mechanical/ environmental  arrangements mean it cannot be damaged easily -  depends what is moving about - trolleys or furniture can quickly scuff a cable, but then wooden battens beside it at key points may be the way forward, as SWA does not do much better, its just that the first thing you reach is the earthed armour, not a live core.


    A note against DZs comment above:

    Many  cheaper lower wattage LED fittings do not contain a regulated supply,  but a series capacitive dropper and bridge rectifier. They are cooler running more reliable and cause less of an EMC issue than some of their expensive counterparts. Apart from that they have nothing in their favour.
    a5aa07cd668fef36b99f3e4d74c99e96-original-led_lamp.png

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  • 0
    yes, OK if the mechanical/ environmental  arrangements mean it cannot be damaged easily -  depends what is moving about - trolleys or furniture can quickly scuff a cable, but then wooden battens beside it at key points may be the way forward, as SWA does not do much better, its just that the first thing you reach is the earthed armour, not a live core.


    A note against DZs comment above:

    Many  cheaper lower wattage LED fittings do not contain a regulated supply,  but a series capacitive dropper and bridge rectifier. They are cooler running more reliable and cause less of an EMC issue than some of their expensive counterparts. Apart from that they have nothing in their favour.
    a5aa07cd668fef36b99f3e4d74c99e96-original-led_lamp.png

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