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AS 2381.1-1991 electrical equipment for explosive atmospheres - selection, installation and maintenance - general requirements

Standard Number:  AS 2381.1-1991
Title:  electrical equipment for explosive atmospheres - selection, installation and maintenance - general requirements
Language:  English
Status:  Withdrawn
Publisher:  Australia Standards(AS)
Price:  
Number of Pages:39  

Preface:   
Description:Specifies general requirements for the selection, installation and maintenance of electrical equipment for use in areas where flammable materials are generated, processed, handled or stored, and which are therefore potentially hazardous.  
Catalog:Document Contents
AS 2381.1-1991 ELECTRICAL EQUIPMENT FOR EXPLOSIVE ATMOSPHERES-SELECTION, INSTALLATION AND...
PREFACE
CONTENTS
FOREWORD
SECTION 1 GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS.
1.4.1 Approved, approval
1.4.2 Area, hazardous
1.4.3 Area, non-hazardous
1.4.4 Authority, authority having jurisdiction
1.4.5 Chemical compatibility
1.4.6 Class I areas
1.4.7 Class II areas
1.4.8 Cloud ignition temperature
1.4.9 Combustible dust
1.4.10 Degree of protection of enclosures
1.4.11 Ex component
1.4.12 Explosive atmosphere
1.4.13 Explosion-protection
1.4.14 Flammable gas or vapour
1.4.15 Flammable liquid
1.4.16 Flammable material
1.4.17 Flashpoint
1.4.18 Hazard
1.4.19 Ignition source
1.4.20 Ignition temperature (of an explosive gas atmosphere)
1.4.21 Layer ignition temperature (of dusts)
1.4.22 Lower explosive limit (LEL)
1.4.23 Maximum surface temperature
1.4.24 Source of release
1.4.25 Temperature classification
1.4.26 Unprotected surface
1.4.27 Upper explosive limit (UEL)
1.5 STATUTORY REGULATIONS
1.6 CLASSIFICATION OF HAZARDOUS AREAS
1.7 OTHER CONSIDERATIONS
1.7.1 Toxic risks
1.7.2 Non-electrical ignition sources
1.7.3 Static electricity
1.7.4 Lightning
1.7.5 Electromagnetic radiation
1.7.6 Cathodic protection
1.7.7 Personal equipment
1.8 PREVENTION OF EXPLOSION
1.8.1 General
1.8.2 Suppression or avoidance
1.8.3 Explosion-protected electrical equipment
1.8.4 Conditions of control
1.9 COMPLIANCE WITH OTHER PARTS OF THIS STANDARD
SECTION 2 SELECTION OF ELECTRICAL EQUIPMENT
2.1 SCOPE OF SECTION
2.2 CLASS I HAZARDOUS AREAS
2.2.1 Information required
2.2.2 Selection with respect to area classification
2.2.3 Selection with respect to temperature classification
2.2.4 Selection with respect to equipment grouping
2.3 CLASS II HAZARDOUS AREAS
2.3.1 Information required
2.3.2 Selection with respect to ambient temperature limitation
2.3.3 Selection with respect to area classification
2.3.4 Selection with respect to temperature classification
2.3.5 Types of protection
SECTION 3 INSTALLATION
3.1 SCOPE OF SECTION
3.2 APPLICATION
3.3 ACCESS FOR INSPECTION
3.4 ELECTRICAL RATING
3.5 PROTECTION FROM MECHANICAL AND ENVIRONMENTAL INJURY
3.6 SPECIAL INSTALLATION TECHNIQUES
3.6.1 General
3.6.2 Wiring entry
3.6.3 Unused cable entries
3.6.4 Glands and seals
3.7 EARTHING
3.8 EQUIPOTENTIAL BONDING
3.9 ELECTRICAL PROTECTION
3.9.1 General
3.9.2 Earth-fault protection
3.9.3 Installations not exceeding 650V
3.9.4 Location of protection and control equipment
3.10 ENCLOSURE AND TERMINATION OF EARTHING CONDUCTORS
3.11 ISOLATION
3.12 EMERGENCY SUPPLIES
3.13 WIRING SYSTEMS-GENERAL REQUIREMENTS
3.13.1 Specific methods not permitted
3.13.2 Permitted types
3.13.3 Telecommunications circuits
3.13.4 Consideration of environment
3.13.5 Electrical continuity of metallic enclosures, conduits, sheaths and armour
3.13.6 Circuits traversing a hazardous area
3.13.7 Segregation of wiring systems
3.13.8 Flexible connections to fixed equipment
3.13.9 Surge protection of circuits supplied from overhead lines
3.14 EQUIPMENT - GENERAL REQUIREMENTS
3.14.1 Specific equipment not permitted in hazardous areas
3.14.2 Permitted equipment
3.14.3 Equipment above hazardous areas
3.15 INSTALLATIONS IN ZONE O AREAS
3.15.1 Cable systems
3.15.2 Conduit systems
3.16 INSTALLATIONS IN ZONE 1 AREAS
3.16.1 Flexible connections
3.16.2 Conduit systems
3.16.3 Fixed cable systems
3.16.4 Plugs and socket-outlets
3.16.5 Pendant luminaires
3.16.6 Ovens
3.16.7 Heating cables
3.16.8 Canned pumps and process connections
3.16.9 Motors
3.17 INSTALLATIONS IN ZONE 2 AREAS
3.17.1 Wiring systems
3.17.2 Switchgear and controlgear
3.17.3 Combined switch and socket-outlets
3.17.4 Pendant luminaires
3.17.5 Canned pumps and process connections
3.18 INSTALLATIONS IN CLASS II AREAS
3.18.1 Wiring systems
3.18.2 Dielectrics having a flashpoint exceeding 250°C
3.18.3 Luminaires
3.18.4 Pendant luminaires
SECTION 4 INSPECTION AND TESTING, INCLUDING COMMISSIONING
4.1 GENERAL
4.2 DOCUMENTATION
4.3 QUALIFICATIONS OF PERSONNEL
4.4 INSPECTION
4.5 TESTING
4.5.1 General
4.5.2 Pre-commissioning tests
4.5.3 Procedure for testing compliance of circuit with Clause 3.9.3(b)
4.6 PRECAUTIONS
4.6.1 Equipment to be rendered dead
4.6.2 Check on explosive atmosphere
4.6.3 Igniting agencies
SECTION 5 MAINTENANCE
5.1 SCOPE OF SECTION
5.2 GENERAL
5.3 FLEXIBLE CABLES AND CORDS
5.4 CLEANLINESS
5.5 ALTERATIONS
5.6 WELDING
5.7 WITHDRAWAL FROM SERVICE
5.8 FASTENINGS AND TOOLS
5.9 WEATHER PROTECTION
5.10 ANTICONDENSATION DEVICES
5.11 VIBRATION EFFECTS
5.12 NON-CONDUCTIVE ELECTRICAL EQUIPMENT
APPENDIX A - PROPERTIES OF FLAMMABLE LIQUIDS, VAPOURS AND GASES
A1 SCOPE
A2 FLASHPOINT
A2.1 General
A2.2 Materials having high flashpoints
A2.3 Classification of flashpoints
A3 IGNITION TEMPERATURE
A3.1 General
A3.2 Use of ignition temperature
A4 EXPLOSIVE (FLAMMABLE) LIMITS
A5 EXPLOSIVE (FLAMMABILITY) RANGE
A6 VAPOUR DENSITY
A6.1 General
A6.2 Effects of temperature changes
A7 BOILING POINT
A8 TEMPERATURE CLASSIFICATION
A9 CLASSIFICATION OF GASES AND VAPOURS
A9.1 General
A9.2 Classification according to the Maximum Experimental Safe Gaps (MESG)
A9.3 Classification according to the Minimum Igniting Currents (MIC)
A9.4 Classification according to MESG and MIC
A9.5 Classification according to a similarity of chemical structure
A9.6 Tables of gases
A10 GENERAL CONSIDERATIONS
A10.1 Relation between ignition temperature and maximum surface temperature
A10.2 Mixtures of compounds
A10.3 Mists
A10.4 Impurities
A10.5 Effect of environments having other than normal atmospheric conditions
APPENDIX B - FRICTIONAL SPARKING RISKS WITH LIGHT METALS AND THEIR ALLOYS
B1 GENERAL
B2 RIGIDLY MOUNTED EQUIPMENT
B3 PORTABLE AND TRANSPORTABLE EQUIPMENT
B4 FANS
B5 ALUMINIUM CONDUCTORS
APPENDIX C - CALCULATION OF THE EXPLOSIVE LIMITS FOR A MIXTURE OF GASES
C1 LIMITS FOR SIMPLE MIXTURES
C2 LIMITS FOR COMPLEX INDUSTRIAL GAS MIXTURES
APPENDIX D - MARKING OF EXPLOSION-PROTECTED ELECTRICAL EQUIPMENT
D1 GENERAL
D2 INFORMATION TO BE MARKED
D3 MIXED TYPES OF EXPLOSION-PROTECTION
D4 ORDER OF MARKING
D5 MARKING OF EXCOMPONENTS
D6 MARKING OF SMALL ELECTRICAL EQUIPMENT
D7 METHOD OF MARKING
D7.1 General
D7.2 Adhesive metallic labels
D7.3 Nameplates
D7.4 Other forms of labelling
D8 EXAMPLES OF MARKING
APPENDIX E - LIST OF REFERENCED DOCUMENTS
APPENDIX F - RELATIONSHIP BETWEEN EQUIPMENT GROUPS AND FORMER GAS GROUPS OR CLASSES
  
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Tile in English:  electrical equipment for explosive atmospheres - selection, installation and maintenance - general requirements

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