Got 31.311 for question 3 part 2.....not too sure what ive done wrong here saying its partially correct?
How did you work out your Vc value?
I can't figure out how you got 31.311
Voltage drop: total voltage drop allowed is 11.5 (5% of 230V)
Therefore, 11.5 - 2.5 = 9V
Vc = 1000xVD divided by ampsxlength
= 1000x9 / 23x15
= 26.09 (single phase)
26.09 x 0.866 = 22.59 (three phase)
Therefore use table to find Vc value at 75 degrees
22.59 lies in between 2 values, use the smaller value = 2.5mm cable
Hopefully that helps
Therefore, 11.5 - 2.5 = 9V
Vc = 1000xVD divided by ampsxlength
= 1000x9 / 23x15
= 26.09 (single phase)
26.09 x 0.866 = 22.59 (three phase)
Therefore use table to find Vc value at 75 degrees
22.59 lies in between 2 values, use the smaller value = 2.5mm cable
Hopefully that helps
Ok, Now I get it. It never occured to me that someone would answer the question that way. You are correct but it's not what I was expecting. 