![]() ![]() Absolute safety, in the sense of the impossibility of a more or less unfortunate incident occurring, is not attainable realistically one must aim for a very low, rather than a zero probability of unwanted occurrences.Ī given system may be looked upon as safe or unsafe only with respect to the performance that is actually expected from it. In order to avoid ambiguity, the general concept of an unwanted occurrence will be employed. ![]() Safety suggests the absence of danger or risk of accident or harm. A machine is a tangible and particularly clear-cut example of a system in this sense, but there are other systems, involving men and women on a team or in a workshop or factory, which are far more complex and not so easy to define. Point to a thumbnail to see figure caption, click to see figure in article context.Ī system can be defined as a set of interdependent components combined in such a way as to perform a given function under specified conditions. Sample form for assessment of hazardous conditions Differences between fall prevention & fall arrestġ3. ![]() Typical fall prevention & fall arrest systemsġ2. Falls from elevations: Quebec 1982-1987ġ1. Integrity requirements: electronic system architecturesġ0. Safety integrity level: type B componentsĩ. Safety integrity levels for protection systemsĨ. Circuit structures’ combinations in machine controlsĦ. Possible dysfunctions of a two-button control circuitĥ. Principles of Prevention: Materials Handling and Internal TrafficĬlick a link below to view table in article context.ġ. Technical Requirements for Safety-Related Systems Based on Electrical, Electronic and Programmable Electronic Devices Toni Retsch, Guido Schmitter and Albert MartyĮlectrical, Electronic and Programmable Electronic Safety-Related Control Systems Principles for the Design of Safe Control Systems Software and Computers: Hybrid Automated Systems US Department of Labor- Occupational Safety and Health Administration edited by Kenneth Gereckeĭevices for Controlling, Isolating and Switching Energy US Department of Labor-Occupational Safety and Health Administration edited by Kenneth Gerecke Chapter Editors: Kenneth Gerecke and Charles T. ![]()
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