Solutions for Automatic Source-Transfer

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Hospitals, pumping stations, shopping malls, auditoriums, and many other commercial, institutional, and industrial power users require a high degree of service continuity for their critical loads. System reliability studies have shown that the power sources serving these facilities constitute the major cause of service interruptions, as a result of their extensive exposure to lightning, wind, and ice, as well as dig-ins and equipment failure.

Before considering more broadly based—and costly—solutions for improving grid reliability, power users having critical loads frequently implement primary-selective service for their facilities to ensure the continuity of power.