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A simple maintenance task can become a life threatening activity when working on operational equipment. Accidents can occur when equipment unexpectedly activates because someone who cannot see what you are doing turns it on, or because you accidentally activate it yourself. Isolation procedures, often called ‘Lockout / Tagout’, are designed to prevent equipment from activating during maintenance and servicing. Topics covered include: General principles; Restrictive devices; Group lockout / lockout; Hidden energy; Key steps to isolation; Tagouts; and Multiple energy sources.