AS 2381.7-1989

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

Sets out requirements for the selection, installation and maintenance of intrinsically safe electrical equipment and systems.

This Standard sets out requirements for the selection, installation and maintenance of intrinsically safe electrical equipment and systems.NOTE: Requirements for the design and construction of intrinsically safe electrical equipment are given in AS 2380.7.

Made Obsolescent 19-08-2013
Under Revision See DR 94384