LV Power Cables routing in Substation

[Histor]

From an LV Switchgear, we are feeding to 3 LV PMCCs through Single-Core cables (PMCC A - 2 Runs of 4x1Cx300Sqmm + E, PMCC-B 3 Runs of 4x1Cx300Sqmm+E and PMCC C - 7 Runs of 4x1Cx300Sqmm+E). All these cables are running less than 40m within Substation. If I put them in a Trefoil arrangement it needs lots of trays. Can I route two layers of these single-core cables in a tray without spacing? or Do I need to always run in Trefoil arrangement with spacing? Please advise.

Also please advise is it okay to have 7Runs (4x1C + E) of Single core cables for PMCC incomer? Thanks.

 

[7anoter4]

It is better to run the cables in trefoil formation in order to avoid current unbalancing-if the cables are running in a plane -one beside one- the current unbalance could be up to 30%[that means on phase A-for instance one cable will be 700 A and another 400 A.See the attached article.