1 - AS 1076.13-1977 SELECTION, INSTALLATION AND MAINTENANCE OF ELECTRICAL APPARATUS AND ASSOCIATED EQUIPMENT FOR USE IN EXPLOSIVE ..
4 - PREFACE
6 - CONTENTS
7 - FOREWORD
8 - CODE
8 - 1 SCOPE
8 - 2 DEFINITIONS
8 - 2.1 Analyzer
8 - 2.2 Area classification
8 - 2.3 Electrical apparatus
8 - 2.4 Enclosure
8 - 2.5 Enclosure group
8 - 2.6 Explosive gas/air mixture
9 - 2.7 Fallible component
9 - 2.8 Flammable
9 - 2.9 Flammable substance
9 - 2.10 Flexible member
9 - 2.11 Grouping of gases and vapours
9 - 2.12 Ignition temperature
9 - 2.13 Instrument
9 - 2.14 Instrument system
9 - 2.15 Means of ignition
9 - 2.16 Protective gas
9 - 2.17 Purge
9 - 2.18 Source of release
9 - 2.19 Temperature class
10 - 2.20 Type of protection
10 - 3 PREVENTION OF EXPLOSION
10 - 3.1 Explosion Probability
10 - 3.2 Achieving Low Explosion Probability
10 - 4 AREA CLASSIFICATION, TEMPERATURE CLASS AND GROUPING OF GASES AND VAPOURS
10 - 4.1 General
11 - 4.2 Area Classifications
11 - 4.3 Considerations Affecting Classification and Extent of Hazardous Areas
11 - 4.3.1 General
11 - 4.3.2 Characteristics of flammable substance
12 - 4.3.3 Grade of source of release
12 - 4.3.4 Quantity and method of release
12 - 4.3.5 Type of ventilation
12 - 4.3.6 Climatic conditions
13 - 4.4 Temperature Class
13 - 4.5 Grouping of Gases/Enclosure Group
14 - 5 INSTRUMENT ENCLOSURES, PROTECTION AND LOCATION
14 - 5.1 Enclosures
14 - 5.2 Explosion Hazards Inside Enclosures
14 - 5.3 Protection
15 - 5.4 Single Enclosure
15 - 5.5 Nested Enclosures
15 - 5.6 Locations
16 - 6 PROTECTION FOR ELECTRICAL INSTRUMENTS NOT CONTAINING A SOURCE OF RELEASE.
16 - 6.1 Type of Protection
16 - 6.1.1 General
16 - 6.1.2 Special protection (Ex s)
16 - 6.1.3 Intrinsic safety (Ex ia and Ex ib)
17 - 6.1.4 Flameproof enclosure (Ex d)
17 - 6.1.5 Pressurized enclosure (Ex p)
18 - 6.1.6 Increased safety (Ex e)
18 - 6.1.7 Encapsulation
18 - 6.1.8 Hermetic sealing (Ex h)
18 - 6.1.9 Type ‘n’ protection (Ex n)
19 - 6.1.10 Restricted breathing (Ex n)
19 - 6.2 Unprotected Electrical Apparatus
19 - 7 ENCLOSED SOURCE OF RELEASE
19 - 7.1 General
19 - 7.2 Type and Extent of Internal Release
20 - 7.3 Combination of Types of Release
20 - 7.3.1 Relevant combinations
20 - 7.3.2 Condition 1 (No normal release, restricted abnormal release)
21 - 7.3.3 Condition 2 (No normal release, unrestricted abnormal release)
21 - 7.3.4 Condition 3 (Limited normal release, restricted abnormal release)
21 - 7.3.5 Condition 4 (Limited normal release, unrestricted abnormal release)
22 - 7.3.6 Condition 5 (Unlimited release)
22 - 7.4 Effect on Area Classification
23 - 8 PROTECTION FOR ELECTRICAL INSTRUMENTS CONTAINING A SOURCE OF RELEASE.
23 - 8.1 Types of Enclosure
23 - 8.2 Flameproof Enclosure
23 - 8.3 Pressurized and Continuously Diluted Enclosures
25 - 8.4 Other Enclosures
26 - 9 SELECTION OF A TYPE OF PROTECTION
26 - 9.1 General
26 - 9.2 Use of Table 1
26 - 9.3 Use of Table 2
27 - 9.4 Examples
27 - 9.4.1 Example 1
30 - 9.4.2 Example 2
30 - 9.4.3 Example 3
31 - 9.4.4 Example 4
32 - 10 INSTALLATION
32 - 10.1 General
32 - 10.2 Permanent Wiring
32 - 10.2.1 Type of cable
33 - 10.2.2 Avoidance of damage
33 - 10.2.3 Avoidance of the transmission of flammable substances
33 - 10.2.4 Cable glands, terminal boxes and junction boxes
34 - 10.2.5 Earthing
34 - 10.3 Circuit Protection.
34 - 10.4 Installation of Intrinsically Safe Instrument Systems
35 - 11 INSPECTION, TESTING AND MAINTENANCE
35 - 11.1 General
35 - 11.2 Isolation
35 - 11.3 Insulation Testing
36 - 11.4 Testing of Intrinsically Safe Instrument Systems
36 - 11.4.1 Functional testing
36 - 11.4.2 Validity testing
36 - 11.5 Alterations
37 - APPENDIX A - LIST OF RELATED PUBLICATIONS