Mechanical Energy Source

Mechanical energy sources can also be called kinetic energy sources or motion energy sources. Even after other energy sources have been locked out, the potential for motion in certain parts of the machinery could still exist. Examples of sources of mechanical energy that could be unexpectedly released during maintenance and injure or kill workers include: tensioned springs, suspended loads, rotating fan blades, angled slides, and/or imbalanced conditions.
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To ensure safe conditions for maintenance, equipment subject to movement must be properly restrained and/or positioned so that it cannot move. This means that rather than being locked out, mechanical energy sources are usually blocked/restrained or the energy is dissipated.

For example, a suspended load may be supported by a block; a compressed spring may be released; a pin may be used to secure a part; equipment may be bottomed out; restraints may be used on swinging parts; brakes may be used to stop fan blades. However, each situation is unique. Always follow the directions of the equipment manufacturer or the qualified person who has developed specific procedures for each job.