A rural school building on co-op power has a vacuum pump sewage system in half of an addition to the school. The system operates on 460 volt 3-phase power. The control panel is fed by a 100 amp 460 volt disconnect that is powered by a 208 volt to 460 volt step up transformer. There is a 200 amp 208 volt disconnect protecting the transformer that is fed from a 200 amp fused disconnect in a MDP 200 feet away. The XO lug in the transformer is bonded to the frame and the circuit grounding conductors are attached to the bonding point and connected back to the MDP. The ground wire insulation is burned off or bubbled in every raceway of this system. One of the fuses in the MDP switch that feeds this circuit is open. There are signs of overheating on the contactors to the pump motors. There are power problems with co-op power supply and a standby generator system that was operating when we arrived as the open fuse caused the gen. to run when the co-op power came back on. Any ideas on this.