Page 8 - Electrical Installation in Hazardous Area

Contents

Preface xvii

1 Introduction 1
1.1 Examples of historic incidents 1
1.2 Technological approach 2
1.3 History of development 4
1.4 UK legislation 6
1.5 European legislation 8
1.6 Certification 10
1.7 Certificate and labelling information 15
1.8 The future of certification 18

2 Area classification 22
Philosophy objectives and procedures 22
2.1 Basic properties of flammable and combustible
materials 22
2.1.1 Flammable gases 22
2.1.2 Flammable vapours 23
2.1.3 Flammable mists 23
2.1.4 Flammable liquids 24
2.1.5 Combustible dusts 24
2.2 Basis of area classification 24
2.3 General approach to area classification 25
2.4 Classification of sources of release 26
2.5 Hazardous zonal classification 27
2.5.1 Gases, vapours and mists 27
2.5.2 Dusts 28
2.5.3 Relationship between sources of release
and Zones 30
2.6 Collection of information 30
2.6.1 Information on fuels (gases, vapours
and mists) 30
2.6.2 Information on fuels (dusts) 32
2.6.3 Information on process conditions 34
2.7 Procedures 34
2.8 Personnel involved 39
2.9 Results of area classification and frequency of repeats 41