Mine submersible pump installation should pay attention to what issues?

Mine submersible pump installation should pay attention to what issues?

1. The power supply voltage fluctuation range between the rated voltage of plus or minus 10%, otherwise will make life cut short or motor burn out.

2. Mine submersible pump cable using three phase four core. One of the eight yellow and green conductor for the grounding line, to be reliable grounding. If without fixed ground wire, 1.5 m long metal rods into the wet earth as earth, three other root wire connected to three-phase power supply.