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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
    Cheers Broadgage!

    "The whole installation" means all parts of the installation that are relevant to the circuit in question.

    So, just to confirm!??... If I have 14 Radials/Ways leaving the Distribution Board to feed different equipment throughout the Nano Brewery (Converted Garage!).  I only need to worry about keeping each Radial/Way under the 4% Voltage Drop allowance?  And not the whole installation?  Is that correct?  I have listed the radials below for reference.  Thanks for your feedback!

    Radial 1 - Control Panel (Switching x4 Immersion Elements,  x1 1.2kW Pump,  x1 Extractor Fan)
    Radial 2 - Instant Water Heater
    Radial 3 - x4 250W Pumps
    Radial 4 - Fermenter 1 & Inkbird Temperature Control
    Radial 5 - Fermenter 2 & Inkbird Temperature Control
    Radial 6 - Power Sockets for HLT (Hot Liquor Tank)
    Radial 7 - Fridge & Freezer
    Radial 8 - Ambient Room Heater
    Radial 9 - LED Lighting Main Room
    Radial 10 - LED Lighting Cool Room
    Radial 11 - LED Flood/Security Lights
    Radial 12 - Conditioning Room Chiller
    Radial 13 - x2 Electric 510W Winches
    Radial 14 - Security/Alarm System

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  • 0
    Cheers Broadgage!

    "The whole installation" means all parts of the installation that are relevant to the circuit in question.

    So, just to confirm!??... If I have 14 Radials/Ways leaving the Distribution Board to feed different equipment throughout the Nano Brewery (Converted Garage!).  I only need to worry about keeping each Radial/Way under the 4% Voltage Drop allowance?  And not the whole installation?  Is that correct?  I have listed the radials below for reference.  Thanks for your feedback!

    Radial 1 - Control Panel (Switching x4 Immersion Elements,  x1 1.2kW Pump,  x1 Extractor Fan)
    Radial 2 - Instant Water Heater
    Radial 3 - x4 250W Pumps
    Radial 4 - Fermenter 1 & Inkbird Temperature Control
    Radial 5 - Fermenter 2 & Inkbird Temperature Control
    Radial 6 - Power Sockets for HLT (Hot Liquor Tank)
    Radial 7 - Fridge & Freezer
    Radial 8 - Ambient Room Heater
    Radial 9 - LED Lighting Main Room
    Radial 10 - LED Lighting Cool Room
    Radial 11 - LED Flood/Security Lights
    Radial 12 - Conditioning Room Chiller
    Radial 13 - x2 Electric 510W Winches
    Radial 14 - Security/Alarm System

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