Maintaining an optimal distance of 30 meters or less reduces problems like voltage spikes. These spikes can exceed 1,500 VDC and damage motor insulation. able distance between the drive and motor? What impacts and design factors need to be considered when a motor is conn ted to a drive using longer cable lengths? What solutions are available to make both the motor d the drive “happy” in this situation? This technical note is intended to educated on. Some drive manufacturers have recommended maximum allowable cable distances for various drive and motor Hp combinations in the <2 Hp applications to mitigate the cable charge effect at the installation planning stage. To. Rated impulse withstand volt. in KV Minimum clearance distances in mm for sites up to 2000 m above sea level Case A (inhomogeneous field) Case B (homogeneous field) Pollution severity Pollution severity 1)3 4 1 2 3 4 0,33 0,01 0,80 1,60 0,01 0,20 0,80 1,60 0,40 0,02 0,10 0,02 0,10 0,50 0,04 0,20. a. power distribution system external to the equipment for supplying power to a. The rating of sub-circuit fuses for a particular motor circuit depends on the factor whether the fuses are of.