Tagout is the process by which an energy-isolating device used for lockout is placed in the off or safe position and a written warning is attached to the device or placed in the area immediately adjacent to the device. The tag must identify the person who applied it and be durable and able to withstand the environment in which it is placed. The tag must be substantial so that it can be attached to a variety of locations and will not come off. A tagout device will be used only when the energy-isolating device is not capable of being locked out. The required means of attachment for a tagout device is a self-locking, non-reusable, nylon cable-type tie that is capable of withstanding a 50-lb.  

Lockout-Tagout Devices such as key or combination locks are used to hold the energy isolation device in a safe position for the duration of the job. Locks are required to be standardized in color, shape or size. The industry best practice for lockout-tagout is all red locks and devices; however, in some facilities, the use of different colored locks may be beneficial for distinguishing between trades. Furthermore, locks must be substantial enough to prevent removal without the use of excessive force and tags must be substantial enough to prevent inadvertent or accidental removal (generally affixed with an all-weather nylon cable tie). These locks and tags must also clearly identify the employee applying and using the device. Tagout devices, which include a prominent warning tag and means of attachment, are also required to be used in conjunction with lockout devices.