1 - AS 2381.7-1989 ELECTRICAL EQUIPMENT FOR EXPLOSIVE ATMOSPHERES-SELECTION, INSTALLATION AND MAINTENANCE - INTRINSIC SAFETY I
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 REFERENCED DOCUMENTS
6 - 1.3 DEFINITIONS
6 - 1.3.1 Associated electrical equipment
6 - 1.3.2 Electrical equipment
6 - 1.3.3 Fault
6 - 1.3.4 Infallible component or infallible assembly of components
6 - 1.3.5 Intrinsically safe circuit
6 - 1.3.6 Intrinsically safe electrical equipment
6 - 1.3.7 Intrinsically safe electrical system
6 - 1.3.8 Normal operation
6 - 1.4 CERTIFICATION.
7 - 1.5 SIMPLE OR LOW ENERGY DEVICES
8 - SECTION 2. SELECTION OF EQUIPMENT
8 - 2.1 GENERAL
8 - 2.2 CATEGORIES
8 - 2.3 GROUPING.
8 - 2.4 PERMISSIBLE USE
8 - 2.4.1 Class I
8 - 2.4.2 Class II
8 - 2.4.3 Associated electrical equipment.
8 - 2.5 TEMPERATURE CLASSIFICATION
8 - 2.5.1 General
8 - 2.5.2 Class I
8 - 2.5.3 Class II
8 - 2.6 ENVIRONMENTAL CONDITIONS.
8 - 2.7 SELECTION OF BARRIER DEVICES
9 - SECTION 3. INSTALLATION
9 - 3.1 SCOPE OF SECTION
9 - 3.2 APPLICATION
9 - 3.3 INTERCONNECTING CABLES
9 - 3.3.1 General
9 - 3.3.2 Minimum conductor size
9 - 3.3.3 Insulation
9 - 3.3.4 Earthing of screening, armouring and metal sheaths
9 - 3.3.5 Identification of cables
9 - 3.3.6 Invasion
9 - 3.3.7 Induction
9 - 3.3.8 Multicore cables in hazardous areas
10 - 3.3.9 Fibre optic cable
10 - 3.3.10 Cable entries
10 - 3.3.11 Conductor terminations
10 - 3.3.12 Cable lengths
10 - 3.3.13 Identification
10 - 3.4 EARTHING
10 - 3.4.1 General
10 - 3.4.2 Earth connections for intrinsic safety
11 - 3.4.3 Other connections to earth
11 - 3.4.4 Bonding conductors
11 - 3.5 CABLE JOINTING DEVICES
11 - 3.5.1 General
11 - 3.5.2 Creepage and clearance distances
11 - 3.5.3 Protection against damage
11 - 3.6 BARRIER DEVICES
11 - 3.6.1 General
11 - 3.6.2 Restrictions on safe area equipment
11 - 3.6.3 Location and protection of barrier devices
11 - 3.7 PROCESS CONNECTIONS
11 - 3.8 MODIFICATION
12 - SECTION 4. INSPECTION, TESTING AND MAINTENANCE
12 - 4.1 GENERAL.
12 - 4.2 DOCUMENTATION
12 - 4.3 FORMS OF INSPECTION
12 - 4.4 ON-SITE ELECTRICAL TESTING
12 - 4.4.1General
12 - 4.4.2 Insulation testing of cables
12 - 4.4.3 Earth free test
12 - 4.4.4 Earth continuity testing
13 - 4.5 MAINTENANCE.
14 - APPENDIX A - DETERMINATION OF EXTERNAL CIRCUIT PARAMETERS FOR INTRINSICALLY SAFE SYSTEMS
14 - A1 CERTIFICATION METHODS
14 - A2 PARAMETERS TO BE DEFINED
14 - A2.1 Entity concept equipment
14 - A2.2 Integrated systems.
14 - A3 INSTALLATION OF ENTITY CONCEPT EQUIPMENT
14 - A4 INSTALLATION OF INTEGRATED SYSTEMS
18 - APPENDIX B - INFORMATION REGARDING INSTALLATION
18 - B1 GENERAL.
18 - B2 INFORMATION REQUIRED
19 - APPENDIX C - INSPECTION, TESTING AND MAINTENANCE
19 - C1 FORMS OF INSPECTION
20 - C2 INSPECTION CHECKS.
20 - C2.1 Area classification
20 - C2.2 Modifications
20 - C2.3 Grouping
21 - C2.4 Surface temperature class
21 - C2.5 Marking
21 - C2.6 Circuit loop number/identification tag
21 - C2.7 Lamps and fuses
21 - C2.8 Safety barriers, relays, and other energy limiting devices
21 - C2.9 Segregation in common marshalling boxes, and relay cubicles
21 - C2.10 Cabling
21 - C2.11 Cable screens
21 - C2.12 Earthing
22 - C2.13 Electrical connections
22 - C2.14 Damage
22 - C2.15 Compliance with documentation
22 - C3 ON-SITE ELECTRICAL TESTING
22 - C3.1 Modified installations
22 - C3.2 Periodic testing
22 - C3.3 Testing with a certified tester
22 - C3.4 Test devices
22 - C4 MAINTENANCE
22 - C4.1 General
22 - C4.2 Check list
23 - C4.3 Removal of electrical equipment
23 - C4.4 Maintenance work in hazardous areas
23 - C4.5 Maintenance work in non-hazardous areas
23 - C4.6 Shunt diode safety barriers
23 - C4.7 Modification or repair
23 - C4.8 Inspection after maintenance
23 - C5 RECORDS
24 - APPENDIX D - GUIDANCE ON EARTHING
24 - D1 SCOPE
24 - D2 GENERAL