29 Cfr 1910.147

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Title 29 → Subtitle B → Chapter XVII → Part 1910 → Subpart J → §1910.147

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Title 29: Labor

PART 1910—OCCUPATIONAL SAFETY AND HEALTH STANDARDS

Subpart J—General Environmental Controls

§1910.147   The control of hazardous energy (lockout/tagout).
(a) Scope, application, and purpose—(1) Scope. (i) This standard covers the servicing and maintenance of
machines and equipment in which the unexpected energization or start up of the machines or equipment, or
release of stored energy could cause injury to employees. This standard establishes minimum performance
requirements for the control of such hazardous energy.
(ii) This standard does not cover the following:
(A) Construction and agriculture employment;
(B) Employment covered by parts 1915, 1917, and 1918 of this title;
(C) Installations under the exclusive control of electric utilities for the purpose of power generation,
transmission and distribution, including related equipment for communication or metering;
(D) Exposure to electrical hazards from work on, near, or with conductors or equipment in electric-utilization
installations, which is covered by subpart S of this part; and

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(E) Oil and gas well drilling and servicing.
(2) Application. (i) This standard applies to the control of energy during servicing and/or maintenance of
machines and equipment.
(ii) Normal production operations are not covered by this standard (See subpart 0 of this part). Servicing
and/or maintenance which takes place during normal production operations is covered by this standard only if;:
(A) An employee is required to remove or bypass a guard or other safety device; or
(B) An employee is required to place any part of his or her body into an area on a machine or piece of
equipment where work is actually performed upon the material being processed (point of operation) or where an
associated danger zone exists during a machine operating cycle.
Note: Exception to paragraph (a)(2)(ii): Minor tool changes and adjustments, and other minor servicing activities, which take place
during normal production operations, are not covered by this standard if they are routine, repetitive, and integral to the use of the
equipment for production, provided that the work is performed using alternative measures which provide effective protection (See
subpart 0 of this part).

(iii) This standard does not apply to the following.
(A) Work on cord and plug connected electric equipment for which exposure to the hazards of unexpected
energization or start up of the equipment is controlled by the unplugging of the equipment from the energy
source and by the plug being under the exclusive control of the employee performing the servicing or
maintenance.
(B) Hot tap operations involving transmission and distribution systems for substances such as gas, steam,
water or petroleum products when they are performed on pressurized pipelines, provided that the employer
demonstrates that (1) continuity of service is essential; (2) shutdown of the system is impractical; and (3)
documented procedures are followed, and special equipment is used which will provide proven effective
protection for employees.
(3) Purpose. (i) This section requires employers to establish a program and utilize procedures for affixing
appropriate lockout devices or tagout devices to energy isolating devices, and to otherwise disable machines or
equipment to prevent unexpected energization, start-up or release of stored energy in order to prevent injury to
employees.
(ii) When other standards in this part require the use of lockout or tagout, they shall be used and
supplemented by the procedural and training requirements of this section.
(b) Definitions applicable to this section.
Affected employee. An employee whose job requires him/her to operate or use a machine or equipment on
which servicing or maintenance is being performed under lockout or tagout, or whose job requires him/her to
work in an area in which such servicing or maintenance is being performed.
Authorized employee. A person who locks out or tags out machines or equipment in order to perform servicing
or maintenance on that machine or equipment. An affected employee becomes an authorized employee when
that employee's duties include performing servicing or maintenance covered under this section.
Capable of being locked out. An energy isolating device is capable of being locked out if it has a hasp or other
means of attachment to which, or through which, a lock can be affixed, or it has a locking mechanism built into it.
Other energy isolating devices are capable of being locked out, if lockout can be achieved without the need to
dismantle, rebuild, or replace the energy isolating device or permanently alter its energy control capability.
Energized. Connected to an energy source or containing residual or stored energy.
Energy isolating device. 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
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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.
Hot tap. A procedure used in the repair, maintenance and services activities which involves welding on a piece
of equipment (pipelines, vessels or tanks) under pressure, in order to install connections or appurtenances. It is
commonly used to replace or add sections of pipeline without the interruption of service for air, gas, water, steam,
and petrochemical distribution systems.
Lockout. The placement of a lockout device on an energy isolating device, in accordance with an established
procedure, ensuring that the energy isolating device and 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 device in a safe position and prevent the energizing of a machine or equipment. Included are
blank flanges and bolted slip blinds.
Normal production operations. The utilization of a machine or equipment to perform its intended production
function.
Servicing and/or maintenance. Workplace activities such as constructing, installing, setting up, adjusting,
inspecting, modifying, and maintaining and/or servicing machines or equipment. These activities include
lubrication, cleaning or unjamming of machines or equipment and making adjustments or tool changes, where
the employee may be exposed to the unexpected energization or startup of the equipment or release of
hazardous energy.
Setting up. Any work performed to prepare a machine or equipment to perform its normal production
operation.
Tagout. The placement of a tagout device on an energy isolating device, in accordance with an established
procedure, to indicate that the energy isolating device and the equipment being controlled may not be operated
until the tagout device is removed.
Tagout device. A prominent warning device, such as a tag and a means of attachment, which can be securely
fastened to an energy isolating device in accordance with an established procedure, to indicate that the energy
isolating device and the equipment being controlled may not be operated until the tagout device is removed.
(c) General—(1) Energy control program. The employer shall establish a program consisting of energy control
procedures, employee training and periodic inspections to ensure that before any employee performs any
servicing or maintenance on a machine or equipment where the unexpected energizing, start up or release of
stored energy could occur and cause injury, the machine or equipment shall be isolated from the energy source,
and rendered inoperative.
(2) Lockout/tagout. (i) If an energy isolating device is not capable of being locked out, the employer's energy
control program under paragraph (c)(1) of this section shall utilize a tagout system.
(ii) If an energy isolating device is capable of being locked out, the employer's energy control program under
paragraph (c)(1) of this section shall utilize lockout, unless the employer can demonstrate that the utilization of a
tagout system will provide full employee protection as set forth in paragraph (c)(3) of this section.
(iii) After January 2, 1990, whenever replacement or major repair, renovation or modification of a machine or
equipment is performed, and whenever new machines or equipment are installed, energy isolating devices for
such machine or equipment shall be designed to accept a lockout device.
(3) Full employee protection. (i) When a tagout device is used on an energy isolating device which is capable of
being locked out, the tagout device shall be attached at the same location that the lockout device would have
been attached, and the employer shall demonstrate that the tagout program will provide a level of safety

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equivalent to that obtained by using a lockout program.
(ii) In demonstrating that a level of safety is achieved in the tagout program which is equivalent to the level of
safety obtained by using a lockout program, the employer shall demonstrate full compliance with all tagoutrelated provisions of this standard together with such additional elements as are necessary to provide the
equivalent safety available from the use of a lockout device. Additional means to be considered as part of the
demonstration of full employee protection shall include the implementation of additional safety measures such as
the removal of an isolating circuit element, blocking of a controlling switch, opening of an extra disconnecting
device, or the removal of a valve handle to reduce the likelihood of inadvertent energization.
(4) Energy control procedure. (i) Procedures shall be developed, documented and utilized for the control of
potentially hazardous energy when employees are engaged in the activities covered by this section.
Note: Exception: The employer need not document the required procedure for a particular machine or equipment, when all of
the following elements exist: (1) The machine or equipment has no potential for stored or residual energy or reaccumulation of
stored energy after shut down which could endanger employees; (2) the machine or equipment has a single energy source which can
be readily identified and isolated; (3) the isolation and locking out of that energy source will completely deenergize and deactivate the
machine or equipment; (4) the machine or equipment is isolated from that energy source and locked out during servicing or
maintenance; (5) a single lockout device will achieve a locked-out condition; (6) the lockout device is under the exclusive control of
the authorized employee performing the servicing or maintenance; (7) the servicing or maintenance does not create hazards for
other employees; and (8) the employer, in utilizing this exception, has had no accidents involving the unexpected activation or
reenergization of the machine or equipment during servicing or maintenance.

(ii) The procedures shall clearly and specifically outline the scope, purpose, authorization, rules, and
techniques to be utilized for the control of hazardous energy, and the means to enforce compliance including, but
not limited to, the following:
(A) A specific statement of the intended use of the procedure;
(B) Specific procedural steps for shutting down, isolating, blocking and securing machines or equipment to
control hazardous energy;
(C) Specific procedural steps for the placement, removal and transfer of lockout devices or tagout devices and
the responsibility for them; and
(D) Specific requirements for testing a machine or equipment to determine and verify the effectiveness of
lockout devices, tagout devices, and other energy control measures.
(5) Protective materials and hardware. (i) Locks, tags, chains, wedges, key blocks, adapter pins, self-locking
fasteners, or other hardware shall be provided by the employer for isolating, securing or blocking of machines or
equipment from energy sources.
(ii) Lockout devices and tagout devices shall be singularly identified; shall be the only devices(s) used for
controlling energy; shall not be used for other purposes; and shall meet the following requirements:
(A) Durable. (1) Lockout and tagout devices shall be capable of withstanding the environment to which they
are exposed for the maximum period of time that exposure is expected.
(2) Tagout devices shall be constructed and printed so that exposure to weather conditions or wet and damp
locations will not cause the tag to deteriorate or the message on the tag to become illegible.
(3) Tags shall not deteriorate when used in corrosive environments such as areas where acid and alkali
chemicals are handled and stored.
(B) Standardized. Lockout and tagout devices shall be standardized within the facility in at least one of the
following criteria: Color; shape; or size; and additionally, in the case of tagout devices, print and format shall be
standardized.
(C) Substantial—(1) Lockout devices. Lockout devices shall be substantial enough to prevent removal without
the use of excessive force or unusual techniques, such as with the use of bolt cutters or other metal cutting tools.

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(2) Tagout devices. Tagout devices, including and their means of attachment, shall be substantial enough to
prevent inadvertent or accidental removal. Tagout device attachment means shall be of a non-reusable type,
attachable by hand, self-locking, and non-releasable with a minimum unlocking strength of no less than 50
pounds and having the general design and basic characteristics of being at least equivalent to a one-piece, allenvironment-tolerant nylon cable tie.
(D) Identifiable. Lockout devices and tagout devices shall indicate the identity of the employee applying the
device(s).
(iii) Tagout devices shall warn against hazardous conditions if the machine or equipment is energized and
shall include a legend such as the following: Do Not Start, Do Not Open, Do Not Close, Do Not Energize, Do Not
Operate.
(6) Periodic inspection. (i) The employer shall conduct a periodic inspection of the energy control procedure at
least annually to ensure that the procedure and the requirements of this standard are being followed.
(A) The periodic inspection shall be perfomed by an authorized employee other than the ones(s) utilizing the
energy control procedure being inspected.
(B) The periodic inspection shall be conducted to correct any deviations or inadequacies identified.
(C) Where lockout is used for energy control, the periodic inspection shall include a review, between the
inspector and each authorized employee, of that employee's responsibilities under the energy control procedure
being inspected.
(D) Where tagout is used for energy control, the periodic inspection shall include a review, between the
inspector and each authorized and affected employee, of that employee's responsibilities under the energy
control procedure being inspected, and the elements set forth in paragraph (c)(7)(ii) of this section.
(ii) The employer shall certify that the periodic inspections have been performed. The certification shall
identify the machine or equipment on which the energy control procedure was being utilized, the date of the
inspection, the employees included in the inspection, and the person performing the inspection.
(7) Training and communication. (i) The employer shall provide training to ensure that the purpose and
function of the energy control program are understood by employees and that the knowledge and skills required
for the safe application, usage, and removal of the energy controls are acquired by employees. The training shall
include the following:
(A) Each authorized employee shall receive training in the recognition of applicable hazardous energy
sources, the type and magnitude of the energy available in the workplace, and the methods and means necessary
for energy isolation and control.
(B) Each affected employee shall be instructed in the purpose and use of the energy control procedure.
(C) All other employees whose work operations are or may be in an area where energy control procedures
may be utilized, shall be instructed about the procedure, and about the prohibition relating to attempts to restart
or reenergize machines or equipment which are locked out or tagged out.
(ii) When tagout systems are used, employees shall also be trained in the following limitations of tags:
(A) Tags are essentially warning devices affixed to energy isolating devices, and do not provide the physical
restraint on those devices that is provided by a lock.
(B) When a tag is attached to an energy isolating means, it is not to be removed without authorization of the
authorized person responsible for it, and it is never to be bypassed, ignored, or otherwise defeated.
(C) Tags must be legible and understandable by all authorized employees, affected employees, and all other
employees whose work operations are or may be in the area, in order to be effective.
(D) Tags and their means of attachment must be made of materials which will withstand the environmental
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conditions encountered in the workplace.
(E) Tags may evoke a false sense of security, and their meaning needs to be understood as part of the overall
energy control program.
(F) Tags must be securely attached to energy isolating devices so that they cannot be inadvertently or
accidentally detached during use.
(iii) Employee retraining.
(A) Retraining shall be provided for all authorized and affected employees whenever there is a change in their
job assignments, a change in machines, equipment or processes that present a new hazard, or when there is a
change in the energy control procedures.
(B) Additional retraining shall also be conducted whenever a periodic inspection under paragraph (c)(6) of this
section reveals, or whenever the employer has reason to believe, that there are deviations from or inadequacies
in the employee's knowledge or use of the energy control procedures.
(C) The retraining shall reestablish employee proficiency and introduce new or revised control methods and
procedures, as necessary.
(iv) The employer shall certify that employee training has been accomplished and is being kept up to date.
The certification shall contain each employee's name and dates of training.
(8) Energy isolation. Lockout or tagout shall be performed only bythe authorized employees who are
performing the servicing or maintenance.
(9) Notification of employees. Affected employees shall be notified by the employer or authorized employee of
the application and removal of lockout devices or tagout devices. Notification shall be given before the controls
are applied, and after they are removed from the machine or equipment.
(d) Application of control. The established procedures for the application of energy control (the lockout or
tagout procedures) shall cover the following elements and actions and shall be done in the following sequence:
(1) Preparation for shutdown. Before an authorized or affected employee turns off a machine or equipment,
the authorized employee shall 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.
(2) Machine or equipment shutdown. The machine or equipment shall be turned off or shut down using the
procedures established for the machine or equipment. An orderly shutdown must be utilized to avoid any
additional or increased hazard(s) to employees as a result of the equipment stoppage.
(3) Machine or equipment isolation. All energy isolating devices that are needed to control the energy to the
machine or equipment shall be physically located and operated in such a manner as to isolate the machine or
equipment from the energy source(s).
(4) Lockout or tagout device application. (i) Lockout or tagout devices shall be affixed to each energy isolating
device by authorized employees.
(ii) Lockout devices, where used, shall be affixed in a manner to that will hold the energy isolating devices in a
“safe” or “off” position.
(iii) Tagout devices, where used, shall be affixed in such a manner as will clearly indicate that the operation or
movement of energy isolating devices from the “safe” or “off” position is prohibited.
(A) Where tagout devices are used with energy isolating devices designed with the capability of being locked,
the tag attachment shall be fastened at the same point at which the lock would have been attached.
(B) Where a tag cannot be affixed directly to the energy isolating device, the tag shall be located as close as
safely possible to the device, in a position that will be immediately obvious to anyone attempting to operate the

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device.
(5) Stored energy. (i) Following the application of lockout or tagout devices to energy isolating devices, all
potentially hazardous stored or residual energy shall be relieved, disconnected, restrained, and otherwise
rendered safe.
(ii) If there is a possibility of reaccumulation of stored energy to a hazardous level, verification of isolation shall
be continued until the servicing or maintenance is completed, or until the possibility of such accumulation no
longer exists.
(6) Verification of isolation. Prior to starting work on machines or equipment that have been locked out or
tagged out, the authorized employee shall verify that isolation and deenergization of the machine or equipment
have been accomplished.
(e) Release from lockout or tagout. Before lockout or tagout devices are removed and energy is restored to the
machine or equipment, procedures shall be followed and actions taken by the authorized employee(s) to ensure
the following:
(1) The machine or equipment. The work area shall be inspected to ensure that nonessential items have been
removed and to ensure that machine or equipment components are operationally intact.
(2) Employees. (i) The work area shall be checked to ensure that all employees have been safely positioned or
removed.
(ii) After lockout or tagout devices have been removed and before a machine or equipment is started,
affected employees shall be notified that the lockout or tagout device(s) have been removed.
(3) Lockout or tagout devices removal. Each lockout or tagout device shall be removed from each energy
isolating device by the employee who applied the device. Exception to paragraph (e)(3): When the authorized
employee who applied the lockout or tagout device is not available to remove it, that device may be removed
under the direction of the employer, provided that specific procedures and training for such removal have been
developed, documented and incorporated into the employer's energy control program. The employer shall
demonstrate that the specific procedure provides equivalent safety to the removal of the device by the authorized
employee who applied it. The specific procedure shall include at least the following elements:
(i) Verfication by the employer that the authorized employee who applied the device is not at the facility;
(ii) Making all reasonable efforts to contact the authorized employee to inform him/her that his/her lockout or
tagout device has been removed; and
(iii) Ensuring that the authorized employee has this knowledge before he/she resumes work at that facility.
(f) Additional requirements—(1) Testing or positioning of machines, equipment or components thereof. In situations
in which lockout or tagout devices must be temporarily removed from the energy isolating device and the
machine or equipment energized to test or position the machine, equipment or component thereof, the following
sequence of actions shall be followed:
(i) Clear the machine or equipment of tools and materials in accordance with paragraph (e)(1) of this section;
(ii) Remove employees from the machine or equipment area in accordance with paragraph (e)(2) of this
section;
(iii) Remove the lockout or tagout devices as specified in paragraph (e)(3) of this section;
(iv) Energize and proceed with testing or positioning;
(v) Deenergize all systems and reapply energy control measures in accordance with paragraph (d) of this
section to continue the servicing and/or maintenance.
(2) Outside personnel (contractors, etc.). (i) Whenever outside servicing personnel are to be engaged in activities

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covered by the scope and application of this standard, the on-site employer and the outside employer shall
inform each other of their respective lockout or tagout procedures.
(ii) The on-site employer shall ensure that his/her employees understand and comply with the restrictions
and prohibitions of the outside employer's energy control program.
(3) Group lockout or tagout. (i) When servicing and/or maintenance is performed by a crew, craft, department
or other group, they shall utilize a procedure which affords the employees a level of protection equivalent to that
provided by the implementation of a personal lockout or tagout device.
(ii) Group lockout or tagout devices shall be used in accordance with the procedures required by paragraph
(c)(4) of this section including, but not necessarily limited to, the following specific requirements:
(A) Primary responsibility is vested in an authorized employee for a set number of employees working under
the protection of a group lockout or tagout device (such as an operations lock);
(B) Provision for the authorized employee to ascertain the exposure status of individual group members with
regard to the lockout or tagout of the machine or equipment and
(C) When more than one crew, craft, department, etc. is involved, assignment of overall job-associated lockout
or tagout control responsibility to an authorized employee designated to coordinate affected work forces and
ensure continuity of protection; and
(D) Each authorized employee shall affix a personal lockout or tagout device to the group lockout device,
group lockbox, or comparable mechanism when he or she begins work, and shall remove those devices when he
or she stops working on the machine or equipment being serviced or maintained.
(4) Shift or personnel changes. Specific procedures shall be utilized during shift or personnel changes to ensure
the continuity of lockout or tagout protection, including provision for the orderly transfer of lockout or tagout
device protection between off-going and oncoming employees, to minimize exposure to hazards from the
unexpected energization or start-up of the machine or equipment, or the release of stored energy.
Note: The following appendix to §1910.147 services as a non-mandatory guideline to assist employers and employees in
complying with the requirements of this section, as well as to provide other helpful information. Nothing in the appendix adds to or
detracts from any of the requirements of this section.

Appendix A to §1910.147—Typical Minimal Lockout Procedure
General
The following simple lockout procedure is provided to assist employers in developing their procedures so they meet the
requirements of this standard. When the energy isolating devices are not lockable, tagout may be used, provided the employer
complies with the provisions of the standard which require additional training and more rigorous periodic inspections. When tagout
is used and the energy isolating devices are lockable, the employer must provide full employee protection (see paragraph (c)(3)) and
additional training and more rigorous periodic inspections are required. For more complex systems, more comprehensive
procedures may need to be developed, documented and utilized.

Lockout Procedure
Lockout procedure for

(Name of Company for single procedure or identification of equipment if multiple procedures are used)

Purpose
This procedure establishes the minimum requirements for the lockout of energy isolating devices whenever maintenance or
servicing is done on machines or equipment. It shall be used to ensure that the machine or equipment is stopped, isolated from all
potentially hazardous energy sources and locked out before employees perform any servicing or maintenance where the
unexpected energization or start-up of the machine or equipment or release of stored energy could cause injury.

Compliance With This Program

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All employees are required to comply with the restrictions and limitations imposed upon them during the use of lockout. The
authorized employees are required to perform the lockout in accordance with this procedure. All employees, upon observing a
machine or piece of equipment which is locked out to perform servicing or maintenance shall not attempt to start, energize or use
that machine or equipment.

Type of compliance enforcement to be taken for violation of the above.

Sequence of Lockout
(1) Notify all affected employees that servicing or maintenance is required on a machine or equipment and that the machine or
equipment must be shut down and locked out to perform the servicing or maintenance.

Name(s)/Job Title(s) of affected employees and how to notify.
(2) The authorized employee shall refer to the company procedure to identify the type and magnitude of the energy that the
machine or equipment utilizes, shall understand the hazards of the energy, and shall know the methods to control the energy.

Type(s) and magnitude(s) of energy, its hazards and the methods to control the energy.
(3) If the machine or equipment is operating, shut it down by the normal stopping procedure (depress stop button, open switch,
close valve, etc.).

Type(s) and location(s) of machine or equipment operating controls.
(4) De-activate the energy isolating device(s) so that the machine or equipment is isolated from the energy source(s).

Type(s) and location(s) of energy isolating devices.
(5) Lock out the energy isolating device(s) with assigned individual lock(s).
(6) Stored or residual energy (such as that in capacitors, springs, elevated machine members, rotating flywheels, hydraulic
systems, and air, gas, steam, or water pressure, etc.) must be dissipated or restrained by methods such as grounding, repositioning,
blocking, bleeding down, etc.

Type(s) of stored energy—methods to dissipate or restrain.
(7) Ensure that the equipment is disconnected from the energy source(s) by first checking that no personnel are exposed, then
verify the isolation of the equipment by operating the push button or other normal operating control(s) or by testing to make certain
the equipment will not operate.
Caution: Return operating control(s) to neutral or “off” position after verifying the isolation of the equipment.

Method of verifying the isolation of the equipment.
(8) The machine or equipment is now locked out.
Restoring Equipment to Service. When the servicing or maintenance is completed and the machine or equipment is ready to
return to normal operating condition, the following steps shall be taken.
(1) Check the machine or equipment and the immediate area around the machine or equipment to ensure that nonessential
items have been removed and that the machine or equipment components are operationally intact.
(2) Check the work area to ensure that all employees have been safely positioned or removed from the area.
(3) Verify that the controls are in neutral.
(4) Remove the lockout devices and reenergize the machine or equipment.
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Electronic Code of Federal Regulations (eCFR)
Note: The removal of some forms of blocking may require reenergization of the machine before safe removal.
(5) Notify affected employees that the servicing or maintenance is completed and the machine or equipment is ready for use.
[54 FR 36687, Sept. 1, 1989, as amended at 54 FR 42498, Oct. 17, 1989; 55 FR 38685, 38686, Sept. 20, 1990; 76 FR 24698, May 2,
2011; 76 FR 44265, July 25, 2011]

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