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Control of Hazardous Energy (Lockout/Tagout)
29 CFR 1910.147
Scope and Application
Who does this standard apply to?
- General Industry workers performing servicing and/or maintenance
on machines or equipment and who are exposed to the unexpected energization, startup, or
release of hazardous energy. (a)(1)(i)
Under the standard, the term "unexpected" also covers situations in which
the servicing and/or maintenance is performed during ongoing normal production operations
if:
- An employee is required to remove or bypass machine guards or other safety devices (a)(2)(ii)(A) or
- An employee is required to place any part of his or her body into a point of operation
or into an area on a machine or piece of equipment where work is performed, or into the
danger zone associated with the machine's operation. (a)(2)(ii)(B)
What activities or operations are covered?
- Any servicing and/or maintenance of machines or equipment when
the source of energy to the machines or equipment is electrical, mechanical, hydraulic,
pneumatic, chemical, thermal, or other energy.
(b) Definition of energy source
- Constructing, installing, setting up, adjusting, inspecting,
modifying, maintaining and/or servicing machines or equipment, including lubrication,
cleaning or unjamming of machines or equipment, and making adjustments or tool changes,
where employees could be exposed to the unexpected energization or startup of the
equipment or release of hazardous energy.
(b) Definition of servicing and /or
maintenance
Who does this standard not apply to?
- General Industry workers performing servicing and maintenance on
machines or equipment who are NOT exposed to the unexpected energization or startup of the
machines or equipment, or the release of hazardous energy.
What activities and operations are not covered?
- Servicing and/or maintenance of equipment performed during normal
production operations if:
- The safeguarding provisions of Subpart O, and other applicable
general industry standards are effective in preventing worker exposure to hazards created
by the unexpected energization or startup of machines or equipment, or the release of
energy.
(a)(2)(ii)
- Minor tool changes and adjustments, and other minor servicing
activities that take place during normal production operations which are routine,
repetitive, and integral to the use of that production equipment, as long as workers are
effectively protected by alternative measures which provide effective machine safeguarding
protection. (a)(2)(ii)(B)
(NOTE:)
- Construction, agriculture, and maritime employment. (a)(1)(ii)(A)
- Installations under the exclusive control of electric utilities
for power generation, transmission, and distribution. (a)(1)(ii)(B)
- Exposure to electrical hazards from work on, near, or with
conductors or equipment in electric utilization installations. (a)(1)(ii)(C)
- Work on cord and plug connected electrical equipment, if:
- The equipment is unplugged from the energy source and the
authorized employee has exclusive control of the plug.
(a)(2)(iii)(A)
- Hot tap operations that involve transmission and distribution
systems for gas, steam, water, or petroleum products on pressurized pipelines, if:
- Continuity of service is essential, shutdown of the system is
impractical, documented procedures are followed, and employees are effectively protected
by special equipment. (a)(2)(iii)(B)
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