Structure of the plant cause discomfort to the people

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structure of the plant, cause discomfort to the people using the plant or introduce new hazards such as pinch points, rough edges or sharp corners. Where some form of physical barrier is provided to prevent access to dangerous parts, the size and position of the barrier should take into account the range in height and build of people using the plant. The design of the guard should be for a specific function, with design consideration being given, where appropriate, to: the placement removal or ejection of work pieces lubrication inspection adjustment repair of machine parts. Guarding should be designed for safe operation of the plant as well as to minimise interference to the plant. The selection of a guard should take into consideration the environment in which it is to be used. Some examples of poor guard selection relative to the environment are: electrical charging of guards on high frequency welders; heating of guards in hot processes; and wire mesh guards on machines emitting splashes. Physical barrier guarding should be constructed of material that is strong enough to resist normal wear and shock that may arise from failure of the parts or processes being guarded; and to withstand long use with a minimum of maintenance. If a guard is likely to be exposed to corrosion, corrosion-resistant materials or surface coatings should be used. When an enclosure is used to prevent access to mechanical, chemical and electrical hazards, there may be an opportunity to control other risks. For example, risk associated with exposure to dust may be controlled by substituting a sheet metal guard for a mesh one provided the accumulation of dust within the guard does not constitute an additional hazard. Where there is a risk of jamming or blockage of moving parts, the designer should ensure that specific work procedures, devices and tools that will enable the plant to be cleared in a way that reduces the risk are documented. If applicable, the designer should ensure that safe systems of work associated with the use and maintenance of the guarding and the maintenance of the components being guarded, are specified in the information provided to the manufacturer. 4.9 Operator control devices A designer of plant must ensure that the design provides for any operator controls to be: identified so as to indicate their nature, function and direction of operation located so they can be readily and conveniently operated located or guarded to prevent unintentional activation, and locked into the “off” position to enable disconnection from power. Badly designed operator controls can lead to unintentional unsafe operation. For example, a control for setting the speed for a cutting device such as a saw or guillotine should not be a simple slider or rotary control. It should be graduated in fixed lockable steps.
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  • Fall '14
  • ........., Occupational safety and health

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