Lockout Tag-out Procedures

Designated Lockout Points and the Components Disconnected

Lock Out and Tag Out

1. Prepare for Shutdown

   • Notify all affected personnel of the intended shutdown of the battery cabinet.

   • Identify all energy sources connected to the battery cabinet, such as electrical, DC, and AC.

2. Shutdown Battery Cabinet

   • Turn off the battery cabinet using the standard shutdown procedure. See “Normal Shutdown Procedure” in the SYSTEM START-UP AND COMMISSIONING topic.

3. Isolate Energy Sources

   • To fully isolate the battery cabinet from all sources, disconnect or turn off all energy sources, such as AC disconnects (VLD, Visible Lockable Disconnect), AC breakers, and DC disconnect switches. Remove the battery pack Manual Service Disconnect (MSD) from each battery pack to completely isolate the batteries.

4. Apply Lockout Devices

   • Attach lockout devices to all energy isolation points of the system. Shut and lock all cabinet doors where necessary.

   • Ensure each lock is uniquely keyed and accessible only by the person performing the lockout.

5. Apply Tags

   • Attach a tag at each isolation point indicating the reason for the lockout, the responsible person, and the date/time.

   • Ensure tags are durable and highly visible.

6. Verify Isolation

   • Verify with a voltmeter or other voltage sensing device that the terminals are no longer electrically live (AC, DC, or other).

7. Perform Maintenance/Service

   • Conduct the necessary maintenance or service while the battery cabinet remains locked out.

8. Restore Power

   • After completing all work, remove all tools and ensure the area around the battery cabinet is clear.

   • Have the person who installed the locks and tags remove them in reverse order.

   • Restore power to the battery cabinet and notify personnel that it is back in operation.