Cable sizing 50kw solar system

[darcybobs21]

Hi All,

Can someone please help me with calculating the cable size of a 50kw 3-phase Ac supply over 35m, on cable tray using swa? Just need to know the cable calculation as im getting confused.

Regards

 

[Richard Burns]

Volt drop for solar should be no more than 1%.
Volt drop in volts is mV/A/m * A * m / 1000
Calculate your amps from I = P / V or I =
Distance is 35m
mV/A/m values are given in table 4D4B in BS7671