TM 5-693 Uninterruptible Power Supply System Selection, Installation, and Maintenance for Command, Control, Communications, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities  

The purpose of this publication is to provide guidance for facilities engineers in selecting, installing, and maintaining an uninterruptible power supply (UPS) system after the decision has been made to install it. This technical manual (TM) TM 5-693 has been prepared to provide generic guidance to agencies responsible for the selection, installation, and maintenance of UPS
systems at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) facilities. Although it is written mainly for C4ISR facilities, which require a higher level of reliability, it could also be utilized as a reference in similar applications.