What depth and width values are being considered for trenches?

The width values that we are considering for trenches in RatedPower vary from 400mm to 800mm for LV, and from 800mm to 1200mm for MV. However, the width measured for all trenches in the CAD layout is a fixed value with 400mm for LV and 600mm for MV regardless of the real dimensions. 

The depth values will vary from 500 to 3500mm in steps of 500mm. The distance left between the first row of cables and the ground is 600mm for LV and 700mm for MV, hence the minimum trench depth in both cases will be 1000mm.