Application of Locks & Tags

A lock and a tag must be placed on each disconnecting means used to de-energize circuits and equipment on which work is to be performed, except as noted. The lock must be attached in a way that prevents persons from operating the disconnecting means unless they resort to undue force or the use of tools.

Each tag must contain a statement prohibiting unauthorized operation of the disconnecting means and removal of the tag.

If a lock cannot be applied, or if the employer can demonstrate that tagging procedures will provide a level of safety equivalent to that obtained using a lock, a tag may be used without a lock.

A tag used without a lock, when permitted, must be supplemented by at least one additional safety measure that provides a level of safety equivalent to that obtained by use of a lock. Examples of additional safety measures include the removal of an isolating circuit element, blocking of a controlling switch, or opening of an extra disconnecting device.

A lock may be placed without a tag only under the following conditions:

• Only one circuit or piece of equipment is de-energized, and
• The lockout period does not extend beyond the work shift, and
• Employees exposed to the hazards associated with reenergizing the circuit or equipment are familiar with this procedure.

To learn more about Construction Lockout/Tagout visit our Construction Lockout/Tagout Online Training web page.