I have seen Electrical Equipment designs that have many voltage levels requirements as:
- Lighting and trace heating 230V 50Hz, alternatively 240V 60Hz
- General services 400/230V 50Hz, alternatively 480/277V 60Hz
- Emergency services 400/230V 50Hz, alternatively 480/277V 60Hz
- Large Electrical Heaters & VSDs 690/400V 50Hz, alternatively 600/346V 60Hz
- Instruments and Emergency Systems 230V 50Hz, alternatively 240V 60Hz, 24V DC
- Communications 230V 50Hz, alternatively 240V 60Hz, 24V DC
So instead of many requirements, can someone share experience on typical design system that accommodate all of the above designs?