Electrical hazards preliminary hazard analysis

The recommended techniques for preliminary hazard analysis are energy trace and barrier analysis (ETBA) and failure modes and effects analysis (FMEA). Recommended techniques for system and subsystem hazard analyses are FMEA, fault tree analysis (FTA), common cause analysis, sneak circuit analysis (for electrical, electronic, and some hydraulic or pneumatic circuits) and, of course, software hazard analysis for software. 

Conduct preliminary hazard review and code analysis ergonomics, safety, electrical, clearance zones, materials of construction, etc. 

A hazard and opeiabilily study (Hazop), is a standard hazard analysis technique used worldwide in the process industries in the preliminary safely assessment of new systems or modihcations to existing ones. The Hazop study is a detailed examination, by a group of specialists, of components within a system to determine what would happen if that component were to operate outside its normal design mode. Each ccmponent will have one or more parameters associated with its operation such as pressure, flow rate, or electrical power. The Hazop study looks at each parameter in turn and uses guide words to list the possible off-normal behaviour such as more , less , high , low , yes , or no . The effect of such behaviour is then assessed. 

In order to derive the required reliabilities of electrical interlocks a preliminary analysis is performed and is based upon the hazard schedule described above. This analysis can be summarised as the crystallisation of required electrical interlock reliabilities taking account of demand rates on the interlocks and any mitigating effects or mechanical interlocks that would reduce the probability of the hazard occurring should the electrical interIbcks fail. 

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See also in sourсe #XX -- [ ]

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