Cable size / Minimal Voltage drop chart
AMPS 1 2 5 10 20 25 30  
1 0.4 0.4 0.4 1.84 1.84 1.84 1.84  
5 1.84 1.84 1.84 4.6 7.9 7.9 13.6  
10 1.84 1.84 4.6 7.9 13.6 13.6 25.7  
20 2.9 2.9 7.9 13.6 25.7 32.2 49.2  
30 4.6 4.6 13.6 25.7 49.2      
40 7.9 7.9 13.6 25.7 49.2      
60 13.6 13.6 25.7 49.2        
                 
Cable Length in Metres
Chart shows cable size in mm2 or sq mm .

This chart is reproduced as a guide ONLY - please check  with your
fully qualified professional electrical engineer before using this information.