Shutting Down Machinery or Equipment
The machine or equipment must be turned off or shut down using the procedures established for it to avoid any additional or increased hazards to workers as a result of the unexpected machine or equipment startup or stoppage.

Isolating Machinery or Equipment
Energy-isolating devices that are needed to control the machine's energy source must be identified. These devices must then be used to isolate the machine or equipment from its energy source(s).
De-energizing equipment means isolating it from its energy source and controlling potential energy so that no energy can flow to the equipment. The method you use to de-energize equipment depends on the form of energy and the means available to control it.
Below is a list of safe practices for de-energizing equipment.
- Disconnecting motors from the equipment
- Isolating electrical circuits
- Disconnecting equipment from energy sources
- Blocking the fluid flow in hydraulic, pneumatic, or steam systems with control valves or by capping or blanking the lines
- Blocking equipment parts that could be moved by gravity
Application of control. The established procedures for the application of energy control (the lockout or tagout procedures) must cover the following elements and actions and must be done in the following sequence:
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- 1910.147(d)(1)
Preparation for shutdown. Before an authorized or affected employee turns off a machine or equipment, the authorized employee must have knowledge of the type and magnitude of the energy, the hazards of the energy to be controlled, and the method or means to control the energy. - 1910.147(d)(2)
Machine or equipment shutdown. The machine or equipment must be turned off or shut down using the procedures established for the machine or equipment. An orderly shutdown must be used to avoid any additional or increased hazard(s) to employees as a result of the equipment stoppage. - 1910.147(d)(3)
Machine or equipment isolation. All energy isolating devices that are needed to control the energy to the machine or equipment must be physically located and operated in such a manner as to isolate the machine or equipment from the energy source(s).
Knowledge Check Choose the best answer for the question.
6-3. During shutdown, what must be identified and used to isolate the equipment or machine from its energy source(s)?
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