480 Volx Xxxxxxary Unit Substations Sample Clauses

480 Volx Xxxxxxary Unit Substations. Overload and fault protection for loads connected to the 480 volt secondary unit substations shall be provided by Solid-State Trip Devices which are an integral part of the drawout type air circuit breakers or separately mounted panel devices. 480-Volt secondary unit substations will be solidly grounded to plant ground grid. Breakers supplying motors or other devices, which do not require coordination with downstream trip devices, shall have adjustable long-time and instantaneous elements for phase protection. Main breakers, tie breakers, and breakers supplying motor control centers (MCCs) or other loads which contain trip devices shall have adjustable long-time and short-time elements for phase protection. The pickup point and time settings shall be adjustable to allow for proper coordination with all downstream trip devices. 12.1.3.4.1 Emergency/Maintenance Generator: 480 V Generators will be protected by multifunction relays (MFR) Beckwith M- 0420 Pride, Multilin 489, or equal.
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