Lockout/tagout procedures are used to prevent the accidental startup of machinery during maintenance or repair work. The key steps are to stop equipment, disconnect power sources, release any residual energy, and secure energy isolating devices with locks or tags. Common causes of injuries are failure to stop equipment, disconnect power, release residual energy, or clear work areas before restarting. Proper lockout procedures must be followed any time maintenance or repair work is performed on machinery to prevent accidental startup and potential injury to workers.