A glossary of terms associated with the power engineering industry with particular emphasis on electrical apparatus for explosive atmospheres. Includes committees responsible, national foreword, guide to the glossary, general terms, physical and chemical phenomena, areas and zones, construction of electrical apparatus, tests of electrical apparatus, flameproof enclosures of electrical apparatus, sand filled electrical apparatus, increased safety electrical apparatus, pressurized electrical apparatus, oil immersed electrical apparatus, intrinsically-safe and associated electrical apparatus.