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Atex guide 1 Selection ATEX GUIDE Basic concepts for protection in explosive atmospheres CGuide to the ATEX directives CONTENTS INTRODUCTION ATEX DIRECTIVE EC EQUIPMENT TYPES OF PROTECTION ATEX DIRECTIVE EC WORKPLACE EQUIPMENT SELECTION EVOLUTION OF DUST

Selection ATEX GUIDE Basic concepts for protection in explosive atmospheres CGuide to the ATEX directives CONTENTS INTRODUCTION ATEX DIRECTIVE EC EQUIPMENT TYPES OF PROTECTION ATEX DIRECTIVE EC WORKPLACE EQUIPMENT SELECTION EVOLUTION OF DUST STANDARDS APPLICATION EXAMPLES AMERICAN STANDARDS ZENITH-P Series Increased safety enclosures junction boxes and control boxes for applications in hazardous environments pag ISOLATORS -EX Series Switch-disconnectors in plastic or metal enclosures pag ZENITH-A Series Sturdy aluminium alloy boxes particularly suited as control stations for applications in explosive atmospheres pag ADVANCE-GRP Series Switched interlocked socket outlets pag ZENITH-T Series Polycarbonate boxes for industrial applications in areas classi ?ed as explosion hazard areas pag OPTIMA-EX Series Industrial plugs pag ZENITH-X Series AISI L steel boxes suited for particularly aggressive environments in explosive atmosphere pag LIT-EX Series Fluorescent housings for applications in explosive atmosphere pag ALUBOX-EX Series Junction boxes in aluminium alloy pag UNION-EX Series Plastic metal cable glands and accessories for applications in explosive atmosphere pag CGuide to the ATEX directives INTRODUCTION What is ATEX ??ATEX ? is the acronym for ??ATmosphere EXplosive ? i e explosive atmosphere An explosive atmosphere is a mixture of ammable gases vapours mists or dusts with air under speci ?c atmospheric conditions in which after ignition has occurred combustion propagates to the ammable mixture In order for a potentially explosive atmosphere to form the ammable substances must be present in a certain concentration If the concentration is too low lean mixture or too high rich mixture no explosion occurs instead there is just a slow combustion reaction or no reaction at all Thus the explosion can occur only in the presence of an ignition source and when the concentration is within the explosive range of the substances i e between the lower explosive limit LEL and upper explosive limit UEL The explosive limits depend on the ambient pressure and the percentage of oxygen in the air ATEX DIRECTIVES The European Union regarding the hazard caused a potentially explosive atmosphere has adopted two harmonized directives on health and safety known as ATEX EC also ATEX a and ATEX EC also ATEX The ATEX Directive EC sets out the Essential Safety Requirements for products and protective systems intended for use in potentially explosive atmospheres and the respective conformity assessment procedures The ATEX Directive EC on the other hand de ?nes minimum health and safety requirements for workplaces with a potentially explosive atmosphere in particular it divides the workplaces into zones according to the probability of having an explosive atmosphere and speci ?es the basic criteria by which the equipment is selected within these zones The ATEX Directive EC was implemented in Italy with Legislative Decree and applies to products placed on the market and or in service after July The ATEX Directive EC was implemented in Italy with Legislative Decree and came into e ?ect on September The subsequent Legislative Decree of April particularly Title XI- Protection from explosive atmospheres and its update Lgs D of in e ?ect as of August have since surpassed Lgs