This document has been prepared to provide generic guidance to agencies responsible for the development and implementation of maintenance programs for site utility systems at command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) sites. This technical manual (TM), TM 5-692-2, describes commonly implemented design features of various mechanical and electrical systems. TM 5-692-1, the companion manual to TM 5-692-2, describes the activities which must be performed to maintain mechanical and electrical equipment at a minimum level of operational readiness.