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Lockout/Tagout 16 Definitions Affected Employee An employee whose job requires operation or use of equipment/machines on which service/maintenance activities are performed under lockout/tagout, or whose job requires work in an area where such service/ maintenance activities are being performed. Authorized Employee An employee who locks out or tags out equipment/machines in order to perform service/maintenance activities. An Affected Employee becomes an Authorized Employee when that employee's duties include performing service/maintenance activities covered under the Iowa State University Lockout/Tagout Program. Energized Connected to an energy source or containing residual or stored energy. Energy Isolating Device (Mechanism) A mechanical device that physically prevents the transmission or release of energy, including but not limited to the following: 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 and, in addition, no pole can be operated independently, a line valve, a block, and any similar device used to block or isolate energy. Push buttons, selector switches and other control circuit type devices are not energy isolating devices. Energy Source Any source of electrical, mechanical, hydraulic, pneumatic, chemical, thermal, or other energy. Lockout The placement of a lockout device on an energy isolating mechanism in accordance with established procedures. The lockout device will ensure that the equipment being controlled cannot be operated until the lockout device is removed. Lockout Device A device that utilizes a positive means such as a lock (either key or combination type) to hold an energy isolating mechanism in a safe position and prevent the energizing of equipment/machines. Included are blank flanges and bolted slip blinds. Service/Maintenance Includes workplace activities such as constructing, installing, setting up, adjusting, inspecting, modifying, or servicing/maintaining equipment/machines. These activities include lubrication, cleaning and unjamming of equipment/machines, and making adjustments or tool changes in areas where employees may be exposed to the unexpected energization or startup of the equipment or to the release of hazardous energy. Tagout The placement of a tagout device on an energy isolating mechanism in accordance with established procedures. The tag should state that the energy isolating mechanism and the equipment being controlled may not be operated until the tagout device is removed.