Lockout/Tagout is a safety procedure used to ensure that machines and equipment are properly shut off and not able to be started up again until maintenance or repair work is completed. The purpose of Lockout/Tagout is to protect workers from hazardous energy sources that could cause injury or death. While the primary energy source is often the most powerful and dangerous, there may be other energy sources or movements within the machine that could also pose a risk. Therefore, it is important to be protected from any energy source or movement, not just the primary one.