Segregated phase bus duct is available for voltages ranging from 600 volts through 38kV, with ratings up to 8000 amps. Segregated phase bus has all phase conductors in a common enclosure with metal barriers between adjacent phases. Conductors may be mounted on molded, fiberglass-polyester blocks or on post insulators. This design is primarily used as a generator lead in power plants, but it is also used in heavy industrial applications and as a switchgear tie in metal-enclosed substations. Higher short circuit ratings are possible in this design.