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Lockout/tagout procedures, often abbreviated as LOTO, are a critical safety practice used in workplaces to prevent accidental startup of machinery and equipment during servicing or maintenance. The primary goal is to ensure that hazardous energy sources are isolated and rendered inoperable before an employee begins work. This prevents severe injuries or fatalities that could result from unexpected machine movement or energization.

The process typically involves several key steps. First, employees must identify all potential sources of hazardous energy, which can include electrical, mechanical, hydraulic, pneumatic, chemical, thermal, and other forms. Then, a thorough shutdown procedure is followed to turn off the equipment safely. Following shutdown, the equipment must be isolated from its energy source. This isolation is achieved through the application of lockout devices, such as locks, and tagout devices, which are warning tags. The lockout device physically prevents the re-energization of the equipment, while the tagout device communicates that the equipment is being serviced and should not be operated.

Once the equipment is locked and tagged out, workers can proceed with their maintenance or servicing tasks. Before restoring power and returning the equipment to service, a thorough inspection must be conducted to ensure all tools and personnel are clear of the machinery. Finally, the lockout and tagout devices are removed, and the equipment can be safely restarted. These procedures are vital for compliance with occupational safety regulations and for fostering a safe working environment.