Where access to the hazard is infrequent, the installation of a fitted guard, that can be removed by use of a tool, may be an acceptable control, where the tool to remove the barrier or guard is not normally available to the operator.
A critical safety system is a safety control system responsible for ensuring the safety of a person when approaching or accessing a hazard. Failure of the critical safety system will leave a person exposed to the hazard, and in danger. Critical safety systems may include barriers or guards fitted to prevent access, or integrated complex interlocking and presence sensing systems.
Captive key systems do not provide full isolation of the power source, but may provide limited temporary access under controlled conditions.
People operating machinery and equipment could: • be required to place their hands close to the mechanism of the machinery and equipment that does the work, and may be injured if caught or trapped by moving parts • be exposed to constant harmful noise, radiated energy or fumes being emitted from the machinery and equipment being operated, or are close to • inadvertently bump or knock poorly placed control levers or buttons • be required to make adjustments to the mechanism of machinery and equipment while the machine is in motion • be required to clear away scrap • make minor adjustments, or reach into the moving mechanism of the machinery and equipment being operated.
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