Follow whatever procedure is right for the equipment, so that you don't endanger anyone during shutdown. Operate all energy isolating devices so that the equipment is isolated from its energy sources. Be sure to isolate all energy sources - secondary power supplies as well as the main one. Never pull an electrical switch while it is under load. Never remove a fuse instead of disconnecting 4.
All energy isolating devices are to be locked, tagged, or both.
There should be just one key for each lock. Use a lockout device if your lock cannot be placed directly on the energy control. More than one employee can lock out a single energy isolating device by using a multiple-lock hasp. If tags are used instead of locks, they must be attached at the same point that you would attach a lock, or as close as possible. Tags must be filled out completely and correctly.