Withdrawn Standard. Withdrawn Date: Feb 06, 2006. The application and performance requirements for a low-voltage uninterruptible power supply (UPS) system used for service in power generating stations are defined. Service conditions and requirements for design application, procurement documents, and testing are covered. The recommendations apply only to semiconductor ac-to-ac converter systems (static) with dc electric energy storage capability. Equipment or component design requirements, safety-related design criteria, or requirements for equipment qualification and preoperational/surveillance testing are not addressed.