| 6 Explosion Protection in North America 31 6.1 Introduction 31 6.2 Classification of Hazardous Locations 31 6.3 Regulations for Installation 32 6.4 Constructional Requirements 32 6.5 Degrees of Protection provided by Enclosures 32 6.6 Certification and Marking 33 7 Appendix 34 7.1 Comparison of IEC Publications and European Standards (EN) 34 7.2 Safety Ratings of Flammable Gases and Vapours 36 7.3 Classification of Hazardous Locations in North America 37 7.4 Constructional Requirements for Explosion Protected 38 Electrical Equipment 7.5 Degrees of Protection according to IEC 60 529 - IPXX 40 7.6 Degrees of Protection according to NEMA Standards 41 8 Literature 42 9 Adresses 44 |