I see. Thanks.
They have a common power supply and not different. I can suggest then that certain faults can be avoided by improving power quality. PLUS IT CAN SAVE ENRGEY. Try the ECTROFLOW SYSTEM.
the power quality solutions can balance the three phase load automatically, it can stabilize voltage, increase power factor up to 100%, mitigate Harmonics to non destructive level, can supply the loss phase in case of single phasing fault, it has 10 features.