1 - AS 3007.2-1987 ELECTRICAL INSTALLATIONS-SURFACE MINES AND ASSOCIATED PROCESSING PLANT - GENERAL PROTECTION REQUIREMENTS
4 - PREFACE
5 - CONTENTS
8 - SCOPE OF PART
8 - REFERENCED DOCUMENTS
9 - SECTION 1. PROTECTION AGAINST DIRECT CONTACT
9 - INTRODUCTION.
9 - 1 GENERAL REQUIREMENTS.
9 - 1.1 Exceptions to the general requirements.
9 - 2 COMPLETE PROTECTION BY MEANS OF BARRIERS OR ENCLOSURES.
9 - 2.0 General.
9 - 2.1 Protection from live parts.
9 - 2.2 Strength and stability of barriers and enclosures.
10 - 2.3 Access to installation.
11 - 3 COMPLETE PROTECTION BY INSULATION OF LIVE PARTS.
11 - 3.1 Degree of insulation.
11 - 3.2 Type of insulation.
11 - 4 PARTIAL PROTECTION BY PLACING LIVE PARTS OUT OF REACH.
11 - 5 PARTIAL PROTECTION BY THE PROVISION OF OBSTACLES.
11 - 6 MINIMUM DISTANCES TO BE OBSERVED IN OPERATING AND MAINTENANCE GANGWAYS FOR INDOOR INSTALLATIONS.
11 - 6.1 Minimum distances.
11 - 6.2 Minimum width.
11 - 6.3 Access.
11 - 7 MINIMUM CLEARANCES FOR OUTDOOR INSTALLATIONS.
11 - 7.1 Application.
11 - 7.2 Minimum clearances to boundary fences.
11 - 7.3 Minimum clearances from accessible areas.
12 - 7.4 Minimum clearances to barriers.
17 - SECTION 2. PROTECTION AGAINST INDIRECT CONTACT - A. C.
17 - INTRODUCTION.
17 - 8 GENERAL.
17 - 8.1 Use of protective conductors.
17 - 8.2 Automatic disconnection of supply.
17 - 8.3 Characteristics of protection.
17 - 8.4 Protective measures other than use of protective conductors.
17 - 8.5 Distinction of supply to fixed and portable or mobile apparatus.
18 - 8.6 Disconnection time for systems above 1000 V.
18 - 8.7 Coordination of protection.
18 - 8.8 Exemption from use of protective conductors.
18 - 9 TN, TT AND IT SYSTEMS DESCRIPTION.
18 - 9.1 General.
18 - 9.2 Description of the systems.
18 - 10 PROTECTIVE MEASURESFOR TNSYSTEMS.
18 - 10.0 General.
18 - 10.1 Bonding of exposed conductive parts.
23 - 10.2 Disconnection following fault.
23 - 10.3 Single conductor as combined protective and neutral conductor.
23 - 10.4 Interruption of combined protective and neutral conductor.
23 - 10.5 Separation of protective conductor from a combined protective and neutral conductor.
23 - 10.6 Conductor identification.
23 - 10.7 Protective devices.
24 - 10.8 Residual-current-operated protective devices.
24 - 10.9 Voltage balance.
24 - 11 PROTECTIVEMEASURES FOR TT SYSTEMS.
24 - 11.0 General.
24 - 11.1 Neutral conductor insulation and installation.
24 - 11.2 Bonding of exposed conductive parts.
24 - 11.3 Conditions to be fulfilled following a fault.
24 - 11.4 Protective devices.
24 - 12 PROTECTIVE MEASURES FOR IT SYSTEMS.
24 - 12.0 General.
25 - 12.1 Isolation or earthing of the power system earthable point.
25 - 12.2 Neutral conductor insulation and installation.
25 - 12.3 Bonding of exposed conductive parts.
25 - 12.4 Operation of the protective devices under fault condition.
25 - 12.5 Protective devices.
25 - 13 REQUIREMENTS FOR EARTH FAULT CURRENT LIMITATION DEVICES.
25 - 13.0 General.
25 - 13.1 Neutral earthing resistors.
25 - 13.2 Neutral earthing reactors and arc suppression coils.
25 - 13.3 Three-phase earth fault current limiting neutral displacement reactor (zero sequence reactor).
25 - 14 EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS.
25 - 14.1 General requirements.
25 - 14.1.1 Performance of earthing arrangements.
26 - 14.1.2 Required components.
26 - 14.1.3 Design, selection and installation.
26 - 14.1.4 Precautions against damage due to electrolysis.
26 - 14.2 Earth electrodes.
26 - 14.2.1 Acceptable types.
26 - 14.2.2 Material and cross-sectional area.
26 - 14.2.3 Type and embedded depth.
26 - 14.2.4 Design of electrodes.
26 - 14.2.5 Allowance for deterioration.
26 - 14.2.6 Measurement of earth resistance.
26 - 14.2.7 Use of metallic pipe systems.
26 - 14.2.8 Use of metallic coverings of cables.
26 - 14.3 Earthing conductors.
26 - 14.3.1 Minimum cross-sectional area.
28 - 14.3.2 Connections to earth electrodes.
28 - 14.4 Main earthing terminals or bars.
28 - 14.4.1 Recommended connection facilities.
28 - 14.4.2 Means of disconnection.
28 - 14.4.3 Current carrying capacity.
28 - 14.5 Interconnection with earthing arrangements of other systems.
28 - 14.5.1 High voltage systems.
28 - 14.5.2 Lightning protection systems.
28 - 14.6 Protective conductors.
28 - 14.6.1 Types of protective conductor.
28 - 14.6.2 Minimum cross-sectional area.
29 - 14.6.3 Preservation of electrical continuity of protective conductors.
29 - 14.7 Earthing arrangements for protective purposes.
29 - 14.7.1 Protective conductors used with overcurrent-operated protective devices.
29 - 14.7.2 Earthing and protective conductors for fault-voltage-operated protective devices.
29 - 14.8 Equipotential bonding.
29 - 14.8.1 Main equipotential bonding.
30 - 14.8.2Supplementary equipotential bonding.
31 - SECTION 3. PROTECTION AGAINST OVERCURRENT
31 - INTRODUCTION.
31 - 15 GENERAL RULE.
31 - 16 NATURE OF PROTECTIVE DEVICES.
31 - 16.1 Devices ensuring protection against both overload current and short-circuit current.
31 - 16.2 Devices ensuring protection against overload current only.
31 - 16.3 Devices ensuring protection against short-circuit current only.
31 - 17 AUTOMATIC INTERRUPTION - PROTECTION AGAINST OVERCURRENT DUE TO OVERLOAD
31 - 17.1 Conditions of application.
31 - 17.2 Rating of protective devices and conductors.
32 - 17.3 Arrangement of the overload protective device.
32 - 17.3.1 Electrical apparatus and live conductors.
32 - 17.3.2 Live conductors.
32 - 18 AUTOMATIC INTERRUPTION - PROTECTION AGAINST SHORT CIRCUITS.
32 - 18.1 Conditions of application.
32 - 18.2 Determination of prospective short-circuit currents.
32 - 18.3 Operating requirements for short-circuit protection.
33 - 18.4 Arrangements of devices for short-circuit protection only.
33 - 19 COORDINATION OF OVERLOAD AND SHORT-CIRCUIT PROTECTION.
33 - 19.1 Protection afforded by one device.
33 - 19.2 Protection afforded by separate devices.
33 - 20 LIMITATION OF OVERCURRENT BY CHARACTERISTICS OF SUPPLY OR LOAD.
33 - 20.1 Limitation by nature of the load.
33 - 20.2 Limitation by nature of the source.
34 - SECTION 4. SELECTION OF PROTECTIVE DEVICES AND PROTECTION SYSTEMS
34 - INTRODUCTION.
34 - 21 BASIC REQUIREMENTS.
34 - 21.1 Fuses.
34 - 21.2 Operating characteristics.
34 - 22 SELECTION PROCEDURE.
34 - 22.1 Selection of protection systems.
34 - 22.2 Selection of devices for protection against short circuits.
34 - 22.3 Selection of devices for protection against overload.
34 - 22.4 Selection against indirect contact.
34 - 23 DISCRIMINATION BETWEEN PROTECTIVE DEVICES.
37 - APPENDIX A - SELECTION OF FACTOR k FOR CALCULATING THE MINIMUM CROSS-SECTIONAL AREA OF PROTECTIVE CONDUCTORS.
37 - A1 PROCEDURE FOR SELECTING VALUES.
37 - A2 SUGGESTED INITIAL TEMPERATURES.
38 - A3 SUGGESTED FINAL TEMPERATURES.
39 - APPENDIX B - DESCRIPTION OF CERTAIN TYPES OF PROTECTIVE DEVICES AND THEIR USES
39 - B1 MEASURING TRANSFORMERS.
39 - B2 RESIDUAL CURRENT OPERATED PROTECTIVE DEVICES.
39 - B3 RESIDUAL VOLTAGE OPERATED PROTECTIVE DEVICES.
39 - B4 FAULT VOLTAGE OPERATED PROTECTIVE DEVICES.
39 - B5 COMBINED RESIDUAL CURRENT/VOLTAGE OPERATED PROTECTIVE DEVICES.
39 - B6 INSULATION MONITORING DEVICES.
39 - B7 DISTANCE RELAYS.
40 - B8 DIFFERENTIAL PROTECTION.
40 - B9 OVERCURRENT OPERATED PROTECTIVE DEVICES.
41 - ANNEX - SUMMARY OF TECHNICAL DEVIATIONS BETWEEN THIS STANDARD AND IEC 621-2*