Explosion protected apparatus selection

When selecting explosion protected apparatus, there are technical (or physical) and financial aspects to be considered. 

Table 3.11 lists the notified bodies according to Directive 94/9/EC. It is noteworthy that competence and responsibility of a notified body may be restricted to certain types of explosion protected equipment (e.g. non-electrical apparatus only), to one group only (e.g. Group II) or to a selection of modules, e.g. to quality assurance related modules. The notified bodies are not obligated to cover the complete field of explosion protection. Nevertheless, some notified bodies cover the total range and can provide a single-stop-procedure to their clients. 

Selection in this chapter is strictly focused on safety related data in the field of explosion protection, neglecting all the other aspects like maintenance or financial considerations (this will be the objective of Chapter 9). Here, selection means the appropriate choice of electrical apparatus according to temperature class and MESG or MIC/MIC (CH4) grouping, taking into account the combustible raw materials and products in the relevant plant. 

Table 5.5 gives a guideline for the selection of explosion protected electrical apparatus, i.e. the appropriate choice of temperature class and group referring to the hazardous substances in the plant to be considered. Very generally Tower temperature classes do comply with the requirements for... 

Table 5.5 Examples for selection and marking of firedamp-proof and explosion protected electrical apparatus according to IEC and EN Standards1...

The selection of electrical apparatus is related to the assignment of risk, e.g. Zone 0, 1 or 2 as specified in International Electrotechnical Recommendation lEC 79-10. The Zone determines the method of explosion protection required for the electrical equipment, and this affects the cost of installation. 

Withdrawn) 1989 AMD 3 Code of practice for selection, installation and maintenance of electncal apparatus for use m potentially explosive atmospheres (other than mining applications or explosives processing and manufacture). Part 1 General recommendations (AMD 7871) dated 15 September 1993. Withdrawn, superseded by BS EN 60079-14 1997 (Withdrawn) 1978 AMD 1 Code of practice for selection, installation and maintenance of electncal apparatus for use m potentially explosive atmospheres (other than mining applications or explosives processing and manufacture). Part 6 Recommendations for type of protection. Increased safety (AMD 5557) dated 30 November 1989. Withdrawn, superseded by BS EN 60079... 

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