I'm working on a power station composed of three 800kva genset:
The power cable will be installed in four big tunnels for each phase I have 5 single core cables 300mm each.
Can I install phase L1 (5x300mm cables) in conduit #1 and L2(5x300mm cale) in the conduit #2 and phase L3(5x300mm) in conduit #3 and neutral (5x300mm cable) in conduit #5, or should I mixed the phases in a same conduit lets say for conduit #1 should contains (cables of phase 1,2 and 3) same for conduit #2, 3 and 4