1 Scope 1.1 Scope This Standard specifies requirements for controlling hazardous energy associated with potentially harmful
machines, equipment, or processes. When a CSA Standard or other recognized Standard exists for a
specific type of machinery, equipment, or process, it should be used with this Standard to provide the
most effective protection.
1.2 Purpose The purpose of this Standard is to specify requirements and performance objectives for procedures,
techniques, designs, and methods to protect personnel from injury from the inadvertent release of
hazardous energy. Release of hazardous energy can include any motion, energization, start-up, or release
of stored energy that, from the perspective of the person(s) at risk, is either unintended or deliberate.
Lockout is recognized as the primary method of hazardous energy control. When the tasks specified in
Clause 1.3 are integral to the production process (see Clause 7.4.2), or traditional lockout prohibits
completion of those tasks, other methods of control that provide effective personal protection are used.
These other methods are based on risk assessment (see Clause 7.4.3). 1.3 Application This Standard applies, but is not limited to, activities such as erecting, installing, constructing, repairing,
adjusting, inspecting, unjamming, setting up, troubleshooting, testing, cleaning, dismantling, servicing,
and maintaining machines, equipment, or processes.
Safeguarding of machines and the control of energy supply systems during normal production activities
are addressed in CSA Z432, the Canadian Electrical Code, Part II, and other machine- and system-specific
Standards. 1.4 Exclusions This Standard does not specify safety procedures for hot tap operations involving transmission and
distribution systems for substances such as gas, steam, water, or petroleum products when such
operations are performed on pressurized pipelines. 1.5 Terminology In CSA Standards, "shall" is used to express a requirement, i.e., a provision that the user is obliged to
satisfy in order to comply with the standard; "should" is used to express a recommendation or that which
is advised but not required; "may" is used to express an option or that which is permissible within the
limits of the standard; and "can" is used to express possibility or capability. Notes accompanying clauses
do not include requirements or alternative requirements; the purpose of a note accompanying a clause is
to separate from the text explanatory or informative material. Notes to tables and figures are considered
part of the table or figure and may be written as requirements. Annexes are designated normative
(mandatory) or informative (non-mandatory) to define their application.