Workplace health and safety laws require the highest order control be applied. Higher order machinery and equipment risk controls are preventative by nature, are effective and durable for the environment it is used in, and deal directly with the hazard at its source.
Where frequent cleaning is required, the guard may be constructed of mesh that prevents intrusion of body parts, but allows for hosing. Food production workplaces, that use conveyors in areas where hygiene or food safety is an integral part of the operation, use fixed mesh guarding of conveyor end rollers.
For access panels or doors supporting an interlocking device allowing access to mechanical parts that move for periods after the energy source is removed, a separate mechanism to delay release of the retaining or locking mechanism may be incorporated.
Machinery and equipment have moving parts. The action of moving parts may have sufficient force in motion to cause injury to people. When assessing machinery and equipment for possible mechanical hazards, consider: machinery and equipment with moving parts that can be reached by people; machinery and equipment that can eject objects (parts, components, products or waste items) that may strike a person with sufficient force to cause harm; machinery and equipment with moving parts that can reach people, such as booms or mechanical appendages (arms); mobile machinery and equipment, such as forklifts, pallet jacks, earthmoving equipment, operated in areas where people may gain access.