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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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    whjohnson:

    RE: Choice of Cable Type, given your earlier description, I wold go NYY. A good rule of thumb  - although not scientific in any meaningful way - is that anything below 1 metre in horizontal height from the floor should really have some mechanical protection via armour/metal trunking/conduit etc.

    NYY should see you right for most of your installation, but take special care when choosing cable for heatars/hot areas.




    Cheers WH! 

    Re Cable choice - what options would you personally go for?

    Main cable runs to power sockets and/or isolators around perimeter run via tray and/or clipped direct, all above 1m from ground - NYY?  SWA?

    Secondary cable runs from Isolator (1m above ground) to Elements (30cm above ground) -  CY?  NYY?  SWA?


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  • 0
    whjohnson:

    RE: Choice of Cable Type, given your earlier description, I wold go NYY. A good rule of thumb  - although not scientific in any meaningful way - is that anything below 1 metre in horizontal height from the floor should really have some mechanical protection via armour/metal trunking/conduit etc.

    NYY should see you right for most of your installation, but take special care when choosing cable for heatars/hot areas.




    Cheers WH! 

    Re Cable choice - what options would you personally go for?

    Main cable runs to power sockets and/or isolators around perimeter run via tray and/or clipped direct, all above 1m from ground - NYY?  SWA?

    Secondary cable runs from Isolator (1m above ground) to Elements (30cm above ground) -  CY?  NYY?  SWA?


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