AS 1076.6-1977

1 - AS 1076, PART 6-1977 SELECTION, INSTALLATION AND MAINTENANCE OF ELECTRICAL APPARATUS AND ASSOCIATED EQUIPMENT FOR USE .....
4 - PREFACE
6 - CONTENTS
7 - FOREWORD
9 - SECTION 1. SCOPE AND GENERAL
9 - 1.1 SCOPE
9 - 1.2 DEFINITIONS
9 - 1.2.1 Increased safety
9 - 1.2.2 Limiting temperature
9 - 1.2.3 Starting current (I A )
9 - 1.2.4 Starting current ratio (IA /IN )
9 - 1.2.5 Time (tE )
10 - 1.2.6 Thermal current limit (Ith )
10 - 1.2.7 Dynamic current limit (Idyn )
10 - 1.2.8 Creepage distance
10 - 1.2.9 Clearance
10 - 1.3 DESCRIPTION OF TECHNIQUE
10 - 1.3.1 Principle
10 - 1.3.2 Practice
10 - 1.3.2.1 Avoidance of arcing and sparking parts
10 - 1.3.2.2 Insulation
11 - 1.3.2.3 Temperature
11 - 1.3.2.4 Enclosure
11 - 1.4 RELEVANT SPECIFICATIONS
11 - 1.5 PERMISSIBLE ZONES OF USE
11 - 1.5.1 Zone 0
12 - 1.5.2 Zones 1 and 2
12 - 1.6 CERTIFICATION AND ASSESSMENT OF APPARATUS AND SYSTEMS
13 - SECTION 2. THE SELECTION OF APPARATUS
13 - 2.1 GENERAL
13 - 2.2 TEMPERATURE CLASS
13 - 2.2.1 Apparatus
13 - 2.2.2 Luminaires
13 - 2.2.3 Ambient Temperature
14 - 2.3 CONDITIONS OF USE
14 - 2.3.1 Electrical and Mechanical Protection
14 - 2.3.2 Chemical Compatibility
14 - 2.4 APPARATUS GROUPING
14 - 2.4.1 Exemption
14 - 2.4.2 Grouping of Additional Types of Protection
15 - 2.5 ROTATING MACHINES AND SIMILAR APPARATUS
16 - SECTION 3. INSTALLATION RECOMMENDATIONS
16 - 3.1 GENERAL
16 - 3.2 INSTALLATION OF APPARATUS
16 - 3.3 AUTOMATIC ELECTRICAL PROTECTION
16 - 3.4 WIRING SYSTEMS
16 - 3.4.1 General Recommendations and Requirements
16 - 3.4.2 Choice of Wiring System
16 - 3.4.3 Permissible Wiring Systems
17 - 3.4.4 Temperature
17 - 3.4.5 Use of Non-armoured Cables
17 - 3.5 INSTALLATION OF METALLIC CONDUIT SYSTEMS
17 - 3.6 INSTALLATION OF NON-METALLIC (PLASTICS) CONDUIT SYSTEMS
18 - 3.7 INSTALLATION OF CABLES
19 - 3.8 CONDUCTOR TERMINATIONS
19 - 3.8.1 General
19 - 3.8.2 Means of Connection
20 - 3.8.3 Maintenance of Non-sparking Characteristics
20 - 3.8.4 Saddle Clamps
20 - 3.8.5 Slot-type Terminals
20 - 3.9 PORTABLE AND TRANSPORTABLE APPARATUS AND ITS CONNECTIONS
21 - SECTION 4. INSPECTION AND MAINTENANCE
21 - 4.1 GENERAL
21 - 4.2 INITIAL AND PERIODIC INSPECTIONS
21 - 4.3 MAINTENANCE
24 - APPENDIX A - SELECTION OF ROTATING MACHINES AND THE ASSOCIATED ELECTRICAL PROTECTION APPARATUS
24 - A1 GENERAL.
24 - A2 SELECTION OF THE MACHINE
24 - A2.1 Enclosure Requirements
24 - A2.2 Voltage Range
24 - A2.3 Duty Type
25 - A2.4 Rating
25 - A2.5 Supply Frequency
25 - A2.6 Cooling
25 - A3 SELECTION OF THE AUTOMATIC ELECTRICAL PROTECTION
25 - A3.1 Limiting Temperature
25 - A3.2 Temperature Rise
26 - A3.3 Class of Insulation
26 - A3.4 Temperature Control
26 - A3.4.1 Types of control
27 - A3.4.2 Current-dependent protective devices
27 - A3.4.3 Cage-rotor and synchronous machines
27 - A3.4.4 Arduous starting conditions
29 - APPENDIX B - APPARATUS MARKING
29 - B1 GENERAL
29 - B2 MARKING REQUIREMENTS
30 - B3 APPARATUS GROUPING
30 - B4 TEMPERATURE CLASS
30 - B5 APPARATUS WITH MULTIPLE TYPES OF PROTECTION
31 - B6 EXAMPLES OF MARKING
31 - B6.1 Type of Protection ‘e’ Only
31 - B6.2 Multiple Types of Protection
32 - B7 MARKING OF ROTATING MACHINES
32 - B7.1 Type of Protection ‘e’ Only
32 - B7.2 Multiple Types of Protection
32 - B7.3 Individual Components
33 - APPENDIX C - IMPACT TEST
34 - APPENDIX D - RESISTANCE TO CHEMICAL ATTACK

Applies to the concept of ensuring electrical safety in hazardous areas by means of type of protection 'e' and offers guidance in the installation and maintenance of protected apparatus in hazardous areas. It does not apply to underground mining, but may be applied to certain surface mining installations. For the purpose of the Standard, explosion risks due to the presence of combustible gases and vapour only are considered.

This Part of the code applies to the concept of ensuring electrical safety in hazardous areas by means of Type of Protection 'e': Increased Safety, and offers guidance in the installation and maintenance of electrical apparatus in hazardous areas which is protected in accordance with the requirements of this type of protection.The recommendations of the code may not apply to the underground mining industry, where other precautions are necessary, though it is recognized that the recommendations of the code may be applied to the surface installations of mines.For the purposes of this Part of the code, explosion risks due to the presence of combustible gases and vapours only are considered. Combustible dusts are therefore excluded except where otherwise noted (see also Part 10 of the code).