Safety devices like barrier guards that are designed to keep workers away from operating machinery don’t do much good when machines are shut down for maintenance and repairs. The danger is that the machinery will start up while being serviced and crush, electrocute, burn and/or amputate the limbs of workers performing the servicing operations. These incidents are typically caused by the inadvertent and unforeseen release of energy left in the system. That’s why OHS laws require you not only to turn off the machine but ensure it’s isolated from its energy source before servicing it. The way to do this is by implementing what’s called a lockout/tagout (LOTO) program.