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Relationship of 1910.147, The Control of Hazardous Energy (Lockout/Tagout)
Standard, to Subpart O, Machinery and Machine Guarding Standards
Hazard of Unexpected Energization
The Lockout/Tagout standard does not apply to servicing and
maintenance operations if employees are not exposed to the risk of injury from the
unexpected energization, start up, or release of hazardous energy while performing service
or maintenance tasks.
Some servicing or maintenance activities do not expose workers
to potential harm from the unexpected energization, startup, or release of hazardous
energy because precautions taken by the employer provide effective employee protection
when performing servicing and maintenance operations. These measures may include the use
of a multi-step startup procedure, time delays, or audible warnings. In such relatively
uncommon situations, lockout/tagout requirements do not apply. However, such
alternative precautions must be carefully evaluated for their effectiveness in
light of the configuration of the machinery, the reliability of the alternative
measures, employee training, and other factors. Refer to
The Control of Hazardous Energy – Enforcement Policy and Inspection Procedures.
OSHA Directive CPL 02-00-147, (2008, February 11) which
provides the framework for evaluating an employer's use of alternative procedures during
servicing and maintenance operations.
The Lockout/Tagout standard does not apply to servicing or
maintaining cord- and plug-connected electrical equipment when the equipment is unplugged
from its energy source and the plug is under the exclusive control of the employee
performing the service and/or maintenance activity. "Under the exclusive
control" refers to instances in which the plug is physically in the possession of the
employee, or in arm's reach and in the line of sight of the employee, or in which the
employee has affixed a lockout/tagout device to the plug. This enables the employee to
prevent the equipment from becoming reenergized during servicing or maintenance.
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