Davebones
Senior Member
- Location
- North Of Tampa Fl
We have installed a 200 hp ( 480 V ) shop air compressor for the plant . We have a 400 amp feed to a disconnect at the compressor . ( fused at 350 amps ) The panel that feeds the air compressor is a 800 amp panel ( not much load on panel ) which is fed from one of our 4000 amp services . Total distance is about 400 ft from air compressor back to the main 4000 amp service . On start-up you can hear a ZZZP ( as our carpenter calls it ) in the instant it starts at the main 4000 amp panel . All connections have been checked so we figure it's just the start-up current . Should we have any other concerns about this ?