OSHA Standard 1910.147(b) Definition - Energy Isolating Devices
Energy Isolating Devices are the primary tool for providing protection under the standard. They are mechanisms that prevent the transmission or release of energy and to which locks and tags are applied. Isolating a machine or piece of equipment from an energy source means using energy isolating device to interrupt the flow of energy from the means of transmission of the energy to the machine.
They include:
- A manually operated electrical circuit breaker
- A disconnect switch
- A manually operated switch by which the conductors of a circuit can be disconnected from all ungrounded supply conductors
- A line valve
- A block or any similar device
But Push buttons, selector switches and other control circuit type devices are not considered as Energy Isolating Devices.
Check OSHA Guidelines - https://www.safetylock.net/learn-lockout-tagout/osha-29-cfr-1910-147-standard/