Submersible pumpset cable selection chart for 415V – Three Phase – 50 Hz. APPLICATIONS:4″ Submersible pump, 6″ Submersible pump. 1. HP 7.5D and above are STARDELTA motors. 2. For STAR DELTA Starting reduce current by 13 for selecting suitable cable Example : For a 20 HP motor at 350 volts and 90 metres actual cable length. Calculated length = (415+350) x 90 = 107m. The size of the 2 cable to be selected for 107m from the chart is 6mm