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33kV and 415V Cable Separation

Hi all, I have a situation where I may use an existing cable trough carrying 33kV trefoil arranged cables, to put a run of 4Cx150 cable for LV supply to a ss building. the 33kv cable is laid in trefoil clamps on the bottom of the trough and the LV cable is clamped to the wall of the trough. The maximum horizontal (angled) distance i can obtain is 385mm between the two different voltage class cables. The parallel run is about 900 meters.

I happened to take some advice and I am told since the MV is screened cable and LV is armoured cable the separation of 300mm is sufficient. But I am not able to find a standard which states this to be correct.

request your suggestions on this.