In theory, lockout/tagout (LOTO) is a simple concept. Basically, you disconnect equipment or circuits from their energy source and put a lock or tag in place, so no one can connect the equipment while you work. This should control any hazardous energy to which employees will be exposed.
The Occupational Safety and Health Administration (OSHA) estimates that 1.6 million U.S. workers enter confined spaces every year. Unfortunately, nearly 100 workers are killed, and more than 5,000 other accidents occur annually in such environments.