GB 12476.2-2006 Electrical apparatus for use in the presence of combustible dust―Part 1-2: Electrical apparatus protected by enclosures and surface temperature limitation―Selection installation and maintenance (Text of Document is in English)

01/01/2007

59P

$200.00 USD

Contents
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements for all types of protection
4.1 Access for inspection
4.2 Associated equipment located in non-hazardous areas
4.3 Segregation
4.4 Electrical rating
4.5 Protection from mechanical damage and environmental injury
4.6 Documentation
4.7 Qualifications of personnel
4.8 Additional considerations
4.9 Prevention of explosion
5 Area classification
6 Selection of electrical apparatus
6.1 Permitted apparatus
6.2 Selection according to dust characteristics and zones
6.3 Selection according to temperature
6.4 Selection of apparatus
7 Protection from dangerous (incendive) sparking
7.1 Danger from live parts
7.2 Danger from exposed and extraneous conductive parts
7.3 Potential equalization
7.4 Static electricity
7.5 Electromagnetic radiation
7.6 Lightning protection
7.7 Cathodically protected metallic parts
8 Electrical protection
8.1 General
8.2 Location of protection and control equipment
8.3 Resetting of short-circuit and earth-fault protection devices
8.4 Protection of rotating electrical machinery
8.5 Loss of supply phase
8.6 Transformer protection
9 Emergency switch-off and electrical isolation
9.1 Emergency switch-off
9.2 Electrical isolation
10 Wiring systems
10.1 General
10.2 Entries for cable and conduit
10.3 Accessories
10.4 Course of wiring
10.5 Barriers
10.6 Flexible connections
10.7 Cable entries
10.8 Unauthorized methods
10.9 Telecommunications circuits
10.10 Unused openings
11 Plugs and socket outlets
11.1 General
11.2 Mounting
11.3 Location
12 Additional requirements for type of protection "Ex tD"
12.1 Practices A and B
12.2 Practice A
12.3 Practice B
12.4 Motors supplied at varying frequency and voltages
13 Additional requirements for type of protection "pD"
13.1 Sources of protective gas
13.2 Automatic switch-off
13.3 Alarm
13.4 Common source of protective gas
13.5 Switching on electrical supply
13.6 Motors supplied at varying frequency and voltages
14 Additional requirements for type of protection "iD"
15 Additional requirements for type of protection "mD"
16 Inspection of installation
16.1 General
16.2 Testing
Annex A (Informative) Examples of dust layers of excessive thickness
Annex B (Normative) Frictional sparking risks with light metals and their alloys