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Mechanical and electrical accidents often result from a combination of unsafe conditions, unsafe acts, and failures in management systems. Consider a scenario in a medium-sized manufacturing plant where a maintenance technician suffers a fatal electric shock while repairing a motor connected to a conveyor system. The accident occurs when the technician assumes that the power supply has been isolated, but residual voltage remains in the system due to improper lockout–tagout procedures and a faulty circuit breaker. The incident also triggers a secondary mechanical hazard when the conveyor unexpectedly restarts, injuring another worker nearby. From a mechanical safety perspective, the unexpected startup of the conveyor indicates a failure in energy isolation and machine guarding principles. Mechanical systems store various forms of energy such as kinetic, potential, hydraulic, and pneumatic energy. In this case, stored electrical energy and possible mechanical inertia in the rotating components were not adequately controlled. The absence of ____ ___ _______ __________ __________ __________ _________ _________ _________ ___ _______.
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