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8923-2 is a requirement set issued by the National Electrical Manufacturers Association (NEMA). It specifies requirements for the determination of the performance of emergency and standby power systems for use in commercial, institutional and industrial applications. The standard describes the various requirements for the system to function correctly, such as emergency power sources, transfer equipment, storage or system controllers, monitoring and emergency shutdown systems, and installation requirements. It is often used to ensure that emergency and standby power systems comply with local codes.