Global Standard for Simple Group Lockout and simplifies the lockout of larger machines
The standard procedure should be that after the equipment to be worked on has been isolated from the energy source, the lockout keys are placed inside the multiple lockout box and then padlocked by the controlling person.
Each person then working on the equipment applies their own unique padlock to the lockout box. Only when all unique padlocks have been removed (including the controller's padlocks) can the necessary keys be re-issued to re-start
Often used where Interlock sytems are in place and the interlock key is then safely stored in the group lockout box.