Single-Phase vs Three-Phase

[marco_feraldi]

Hi All,
Apologies in advance if this question was already discussed in the last, I'm new in the forum.

I need to connect 3 single-phase loads to a distribution board. Each load is 7kW 32A. According to rough calculations, I would need to use a 25mm² cable (L+N+PE) under the following conditions:
6kA fault current
200ms fault time
30m distance
4% voltage drop
XLPE cable
Copper core
In this case I would require 3 times 3x25mm² cables.

I wanted to know what considerations I have to make if I wanted to use a 3-phase cable sized to withstand the 3 loads, so 1 phase per load. L1 to load 1, L2 to load 2, L3 to load 3. Neutral is common to them all.
How to gauge the size of the resulting 3-phase calble (4xcore +PE)?
Thank you
Mark

[nick_moles]

I also have the same problems. I recommend you search instruction on youtube.