1 - AS 3007.2-2004 ELECTRICAL INSTALLATIONS-SURFACE MINES AND ASSOCIATED PROCESSING PLANT - GENERAL PROTECTION REQUIREMENTS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND REFERENCED DOCUMENTS
6 - 1.1 SCOPE
6 - 1.2 REFERENCED DOCUMENTS
7 - SECTION 2 PROTECTION AGAINST DIRECT CONTACT
7 - 2.1 INTRODUCTION
7 - 2.2 GENERAL REQUIREMENTS
7 - 2.2.1 General
7 - 2.2.2 Exceptions to the general requirements
7 - 2.3 COMPLETE PROTECTION BY MEANS OF BARRIERS OR ENCLOSURES
7 - 2.3.1 General
8 - 2.3.2 Protection from live parts
8 - 2.3.3 Strength and stability of barriers and enclosures
9 - 2.3.4 Access to installation
10 - 2.4 COMPLETE PROTECTION BY INSULATION OF LIVE PARTS
10 - 2.4.1 General
10 - 2.4.2 Degree of insulation
10 - 2.4.3 Type of insulation
10 - 2.5 PARTIAL PROTECTION BY PLACING LIVE PARTS OUT OF REACH
10 - 2.6 PARTIAL PROTECTION BY THE PROVISION OF OBSTACLES
11 - 2.7 MINIMUM DISTANCES TO BE OBSERVED IN OPERATING AND MAINTENANCE GANGWAYS FOR INDOOR INSTALLATIONS
11 - 2.7.1 General
11 - 2.7.2 Minimum distances
11 - 2.7.3 Minimum width
11 - 2.7.4 Access
11 - 2.8 MINIMUM CLEARANCES FOR OUTDOOR INSTALLATIONS
11 - 2.8.1 Application
12 - 2.8.2 Minimum clearances to boundary fences
12 - 2.8.3 Minimum clearances from accessible areas
12 - 2.8.4 Minimum clearances to barriers
18 - SECTION 3 PROTECTION AGAINST INDIRECT CONTACT-A.C.
18 - 3.1 INTRODUCTION
18 - 3.2 GENERAL
18 - 3.2.1 Use of protective conductors
18 - 3.2.2 Automatic disconnection of supply
19 - 3.2.3 Characteristics of protection
19 - 3.2.4 Protective measures other than use of protective conductors
20 - 3.2.5 Distinction of supply to fixed and portable or mobile apparatus
20 - 3.2.6 Disconnection time for systems above 1000 V
20 - 3.2.7 Coordination of protection
20 - 3.2.8 Exemption from use of protective conductors
20 - 3.3 TN, TT AND IT SYSTEMS DESCRIPTION
20 - 3.3.1 General
21 - 3.3.2 Description of the systems
21 - 3.4 PROTECTIVE MEASURES FOR TN SYSTEMS
21 - 3.4.1 General
21 - 3.4.2 Bonding of exposed conductive parts
26 - 3.4.3 Disconnection following fault
26 - 3.4.4 Single conductor as combined protective and neutral conductor
27 - 3.4.5 Interruption of combined protective and neutral conductor
27 - 3.4.6 Separation of protective conductor from a combined protective and neutral conductor
27 - 3.4.7 Conductor identification
27 - 3.4.8 Protective devices
27 - 3.4.9 Residual-current-operated protective devices
27 - 3.4.10 Voltage balance
28 - 3.5 PROTECTIVE MEASURES FOR TT SYSTEMS
28 - 3.5.1 General
28 - 3.5.2 Neutral conductor insulation and installation
28 - 3.5.3 Bonding of exposed conductive parts
28 - 3.5.4 Conditions to be fulfilled following a fault
29 - 3.5.5 Protective devices
29 - 3.6 PROTECTIVE MEASURES FOR IT SYSTEMS
29 - 3.6.1 General
29 - 3.6.2 Isolation or earthing of the power system earthable point
29 - 3.6.3 Neutral conductor insulation and installation
29 - 3.6.4 Bonding of exposed conductive parts
29 - 3.6.5 Operation of the protective devices under fault condition
30 - 3.6.6 Protective devices
30 - 3.7 REQUIREMENTS FOR EARTH FAULT CURRENT LIMITATION DEVICES
30 - 3.7.1 General
30 - 3.7.2 Neutral earthing reactors and arc suppression coils
31 - 3.7.3 Three-phase earth fault current limiting neutral displacement reactor (zero sequence reactor)
31 - 3.8 EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
31 - 3.8.1 General requirements
33 - 3.8.2 Earth electrodes.
34 - 3.8.3 Earthing conductors
35 - 3.8.4 Main earthing terminals or bars
35 - 3.8.5 Protective conductors
38 - 3.8.6 Earthing arrangements for protective purposes
38 - 3.8.7 Equipotential bonding
40 - SECTION 4 PROTECTION AGAINST OVERCURRENT
40 - 4.1 INTRODUCTION
40 - 4.2 GENERAL RULE
40 - 4.3 NATURE OF PROTECTIVE DEVICES
40 - 4.3.1 General
40 - 4.3.2 Devices ensuring protection against both overload current and short-circuit current
40 - 4.3.3 Devices ensuring protection against overload current only
40 - 4.3.4 Devices ensuring protection against short-circuit current only
41 - 4.4 AUTOMATIC INTERRUPTION-PROTECTION AGAINST OVERCURRENT DUE TO OVERLOAD
41 - 4.4.1 Conditions of application
41 - 4.4.2 Rating of protective devices and conductors
42 - 4.4.3 Arrangement of the overload protective device
42 - 4.5 AUTOMATIC INTERRUPTION-PROTECTION AGAINST SHORT CIRCUITS
42 - 4.5.1 Conditions of application
42 - 4.5.2 Determination of prospective short-circuit currents
43 - 4.5.3 Operating requirements for short-circuit protection
44 - 4.5.4 Arrangements of devices for short-circuit protection only
44 - 4.6 COORDINATION OF OVERLOAD AND SHORT-CIRCUIT PROTECTION
44 - 4.6.1 Protection afforded by one device
45 - 4.6.2 Protection afforded by separate devices
45 - 4.7 LIMITATION OF OVERCURRENT BY CHARACTERISTICS OF SUPPLY OR LOAD
45 - 4.7.1 Limitation by nature of the load
45 - 4.7.2 Limitation by nature of the source
46 - SECTION 5 SELECTION OF PROTECTIVE DEVICES AND PROTECTION SYSTEMS
46 - 5.1 INTRODUCTION
46 - 5.2 BASIC REQUIREMENTS
46 - 5.2.1 Fuses
46 - 5.2.2 Operating characteristics
46 - 5.3 SELECTION PROCEDURE
46 - 5.3.1 Selection of protection systems
46 - 5.3.2 Selection of devices for protection against short circuits
47 - 5.3.3 Selection of devices for protection against overload
47 - 5.3.4 Selection against indirect contact
47 - 5.4 DISCRIMINATION BETWEEN PROTECTIVE DEVICES
50 - APPENDIX A - SELECTION OF FACTOR k FOR CALCULATING THE MINIMUM CROSS-SECTIONAL AREA OF PROTECTIVE CONDUCTORS...
50 - A1 PROCEDURE FOR SELECTING k VALUES
50 - A2 SUGGESTED INITIAL TEMPERATURES
51 - A3 SUGGESTED FINAL TEMPERATURES
53 - APPENDIX B - DESCRIPTION OF CERTAIN TYPES OF PROTECTIVE DEVICES AND THEIR USES
53 - B1 MEASURING TRANSFORMERS
53 - B2 RESIDUAL-CURRENT-OPERATED PROTECTIVE DEVICES
53 - B3 RESIDUAL-VOLTAGE-OPERATED PROTECTIVE DEVICES
53 - B4 FAULT-VOLTAGE-OPERATED PROTECTIVE DEVICES
53 - B5 COMBINED RESIDUAL CURRENT/VOLTAGE OPERATED PROTECTIVE DEVICES
54 - B6 INSULATION MONITORING DEVICES
54 - B7 DISTANCE RELAYS
54 - B8 DIFFERENTIAL PROTECTION
54 - B9 OVERCURRENT-OPERATED PROTECTIVE DEVICES