Preface:This is the third edition of CAN/CSA-C22.2 No. 60079-1,Explosive atmospheres — Part 1: Equipment protection by flameproof enclosures "d", which is an adoption, with Canadian deviations, of the identically titled IEC (International Electrotechnical Commission) Standard 60079-1 (seventh edition, 2014-06). It supersedes the previous edition published in 2011 as CAN/CSA-C22.2 No. 60079-1 (adopted IEC 60079-1:2007). It is one in a series of Standards issued by CSA Group under Part II of theCanadian Electrical Code.For brevity, this Standard will be referred to as "CAN/CSA-C22.2 No. 60079-1" throughout.This Standard is intended to be used in conjunction with CAN/CSA-C22.2 No. 60079-0,Explosive atmospheres — Part 0: Equipment — General requirements(adopted IEC 60079-0:2011, with Canadian deviations).Changes to this edition includeaddition of requirements for selection of breathing and draining devicesaddition of supplemental mechanical means of securing cemented jointsaddition of material limitations for enclosuresaddition of power factor requirement for plug and socketaddition of marking requirements for Ex enclosuresremoval of Type T cells as acceptable primary cellsScope:This part of IEC 60079 contains specific requirements for the construction and testing of electrical equipment with the type of protection flameproof enclosure "d", intended for use in explosive gas atmospheres.This Standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard will take precedence.