The authors describes the modernization of the power system of a forty-year-old industrial production plant. The updated electrical distribution system fulfils requirements which directed the original design. Features to reduce employee exposure to potential electrical hazards were incorporated. Flexibility of operation was achieved along with means to protect operators from inclement weather and switching errors. A supply of electrical power will be available for all critical loads as long as the public utility or the cogeneration unit remains in service, and no two parallel circuits are simultaneously down. Maintenance needs will definitely be reduced. The ability to serve evolving process operating units is inherent in the final system.
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