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Hac guide 1 TECHNICAL INTRODUCTION This technical guide outlines the design and use of equipment protected against the ignition of hazardous atmospheres formed from gases vapours or dusts The information given applies speci ?cally to Chalmit Lighting prod

TECHNICAL INTRODUCTION This technical guide outlines the design and use of equipment protected against the ignition of hazardous atmospheres formed from gases vapours or dusts The information given applies speci ?cally to Chalmit Lighting products and can also be used as a general guide The guide refers to equipment and methods complying with safety practices being used throughout the world This material is included both for completeness and because Chalmit operates throughout the world supplying all lighting requirements Chalmit hazardous area products are designed and manufactured in accordance with the best engineering practices and to well established construction standards for explosion protected equipment The equipment must be selected installed maintained and disposed of in accordance with any regulation or legislation appropriate to its use Reference must be made to the data sheets and the certi ?cation applying to each individual product The guide also refers to construction standards and application codes The correct application of protected equipment is a specialist subject and these notes must be treated as being only informative In addition to the Chalmit technical information users must themselves study the relevant codes of practice and construction standards Installation operation and maintenance manuals IOM are enclosed with each product and are available on request These contain information essential to the safe use of the equipment and must be read and understood by installers and users before putting equipment into service Much of the information is also available on the Chalmit web site Usually this will be for the latest version of a particular range If detailed information on superseded product is needed Chalmit should be contacted directly International Regional and National Standards - Ongoing Changes This revised technical introduction was prepared in during a period of transition in the history of Ex standardisation As such this section aims to highlight some of the current initiatives underway to simplify and rationalise product standards on a global scale The process of developing product standards which initially began with the invention of equipment for the safe operation of ??gassy mines ? led to the standardisation of the ?? ameproof ? and ??intrinsic safety ? concepts for product design The standardisation of equipment on a national basis is now in its ?nal stage of transition with the ?nal move towards global standardisation under the IEC Ex scheme This may cause some confusion in the short term but leads to international uniformity IEC Standards ATEX The early IEC standards were largely based on the national standards of European countries The ?rst EU Directive for product standardisation prompted the rapid development of Euro-normes EN which were numbered in the EN etc series Gradually the IEC series later re-numbered - series were updated using the EN's as a basis but with growing international input These were mostly the gas hazard standards In the late 's it was agreed in CENELEC that all work that could be carried out at IEC level would be and the standards voted in parallel as IEC standards and EN's These