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Safe machine design is a fundamental component of mechanical and electrical safety management because hazards should ideally be eliminated or controlled at the design stage rather than relying only on workers to avoid them. A properly designed machine considers safety throughout its life cycle, including installation, operation, maintenance, adjustment, cleaning, inspection, and eventual decommissioning. The primary principle is that the machine should perform its intended function while minimizing the possibility of injury, equipment damage, fire, or electrical incidents. The first principle of safe machine design is hazard identification and risk assessment. Designers should systematically identify mechanical, electrical, thermal, chemical, ergonomic, and other hazards associated with the machine. Typical mechanical hazards include rotating shafts, gears, belts, chains, cutting tools, crushing points, shearing points, entanglement, and ejection of materials. Electrical hazards may include electric shock, short circuits, arc flash, overheating, and unexpected energization. After identifying hazards, the severity and probability of possible accidents should be assessed. Appropriate measures should then be incorporated into the design to reduce the risks to an acceptable level. The hierarchy of risk reduction should be followed. The most effective approach is inherently safe design, in which the hazard is eliminated or reduced by changing the machine's design. If elimination is not possible, engineering safeguards such as guards, interlocks, barriers, emergency-stop devices, presence-sensing systems, and protective enclosures should be provided. Administrative controls, warning signs, procedures, and personal protective equipment should be considered supplementary measures rather than substitutes for inherently safe design. Machine guarding is one of the most important principles of mechanical safety. Moving components that can cause injury should be adequately guarded. Fixed guards can prevent access to dangerous parts, while adjustable or interlocked guards can provide controlled access when necessary. Guards should be strong, securely attached, and designed so that they do not introduce additional hazards. Interlocking devices can ensure that a machine cannot operate when a guard is open or removed. Emergency-stop devices should be readily accessible and capable of bringing the machine to a safe condition during an emergency. Safe machine design also requires control of unexpected machine movement. Machines should be designed so that starting cannot occur accidentally after power restoration or following _____ ___ _____ ____ __________ ____.
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