Substations and MCCs Clause Samples

Substations and MCCs. Overload and fault protection for loads connected to the low voltage secondary unit substations (SUS) will be provided by Solid-State Trip Devices (SSTD's) which are an integral part of the drawout type air circuit breakers. Breakers supplying motors or other devices which do not require coordination with downstream trip devices will have adjustable long-time and instantaneous elements for phase protection. Main breakers, tie breakers, and breakers supplying motor control centers (MCC's) or other loads which contain trip devices will have adjustable long-time and short-time SSTD elements for phase protection. The pickup point and time settings will be adjustable to allow for proper coordination with all downstream trip devices. -------------------------------------------------------------------------------- Proprietary Information Page 25 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 19988 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- ELECTRICAL ENGINEERING DESIGN CRITERIA --------------------------------------------------------------------------------