This document provides guidelines on safety and electrostatic discharge (ESD) for maintenance and service personnel at Cray Research, Inc. It outlines the importance of following lockout/tagout procedures to isolate hazardous energy sources when servicing equipment in order to prevent accidents, injuries, and damage. Specific guidelines are provided on using locks and tags to isolate various electrical and mechanical energy sources, such as hydraulics, pneumatics, pressurized water and steam. The document also describes the proper procedures for installing lockout/tagout devices, working in a group lockout/tagout situation, and restoring equipment to service.