![]() Tag out is a labelling process that is always used when lockout is required. See the example of the lock and hasp combination in Figure 1 below. The locking device (or lockout device) can be any device that has the ability to secure the energy-isolating device in a safe position. In most cases, these devices will have loops or tabs which can be locked to a stationary item in a safe position (de-energized position). The energy-isolating device can be a manually operated disconnect switch, a circuit breaker, a line valve, or a block (Note: push buttons, selection switches and other circuit control switches are not considered energy-isolating devices). In practice, lockout is the isolation of energy from the system (a machine, equipment, or process) which physically locks the system in a safe mode. See the OSH Answers Hazardous Energy Control Programs for a description of the types of hazardous energy, and required elements of a control program. Lockout is one way to control hazardous energy. ![]() Lockout is defined in the Canadian standard CSA Z460-20 "Control of Hazardous Energy - Lockout and Other Methods" as the "placement of a lockout device on an energy-isolating device in accordance with an established procedure." A lockout device is "a mechanical means of locking that uses an individually keyed lock to secure an energy-isolating device in a position that prevents energization of a machine, equipment, or a process." ![]()
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