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AS 4262.2-1999
[Current]Telecommunication overvoltages, Part 2: Protection of equipment
Provides guidelines and specifies requirements for the protection from overvoltages and overcurrents of customer equipment connected over twisted pair to telecommunication networks. It is not intended for the protection of persons.
Published: 05/06/1999
Pages: 31
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.5 ABBREVIATIONS
2 PRINCIPLES
2.1 SOURCES OF OVERVOLTAGES AND OVERCURRENTS
2.1.1 General
2.1.2 Telecommunications lines
2.1.3 Power lines
2.1.4 Earth potential rise
2.1.5 Wiring induction loops
2.1.6 Electrostatic discharges (ESDs)
2.1.7 Electrical fast transient (EFT)
2.1.7.1 Sources
2.1.7.2 Coupling
2.1.7.3 Effects
2.1.7.4 Management
2.1.8 Other immunity issues
2.2 EFFECTS OF OVERVOLTAGES AND OVERCURRENTS
2.2.1 Equipment damage
2.2.2 Equipment mis-operation
2.2.3 Equipment lock-up
2.3 PRINCIPLES OF PROTECTION
2.3.1 Inherent (built-in) resistibility
2.3.2 Shunt (overvoltage protection) components
2.3.3 Series (overcurrent protection) components
2.3.4 Isolation devices
2.3.5 Equipotential bonding
2.3.6 Shielding
2.3.7 Wiring layout
2.3.8 Filtering
2.3.9 Location of SPDs
3 ASSESSMENT OF NEED FOR PROTECTION
3.1 CATEGORIES OF TELECOMMUNICATIONS EQUIPMENT
3.1.1 General
3.1.2 Line-powered equipment
3.1.3 Mains-powered equipment without an earth
3.1.4 Mains-powered equipment with a GPO earth
3.1.5 Mains-powered equipment with an earth provided by a telecommunication reference conductor (TRC) or a communications earth system (CES)
3.2 SUSCEPTIBILITY OF CUSTOMER EQUIPMENT TO DAMAGE
3.2.1 Line-powered equipment
3.2.2 Mains-powered double-insulated equipment without an earth
3.2.3 Mains-powered equipment with a GPO earth
3.2.3.1 Protection comparison
3.2.3.2 Equipment with operational insulation
3.2.3.3 Equipment with basic insulation or better
3.2.4 Mains-powered equipment with a hard-wired earth
3.2.4.1 Protection comparison
3.2.4.2 Equipment with operational insulation
3.2.4.3 Equipment with basic insulation or better
3.3 COST AND IMPORTANCE OF THE EQUIPMENT
3.4 ENVIRONMENT
3.5 ASSESSMENT OF THE NEED FOR PROTECTION
4 PROTECTION SYSTEMS
4.1 PROTECTION SYSTEMS COMPONENTS
4.1.1 Telecommunications line SPDs
4.1.1.1 General
4.1.1.2 Single-stage versus multi-stage circuits
4.1.1.3 D.C. breakdown voltage
4.1.1.4 Impulse let-through voltage performance
4.1.1.5 Rated impulse discharge current
4.1.1.6 Overcurrent protection
4.1.1.7 Co-ordination of primary and secondary protection
4.1.2 Power line SPDs
4.1.2.1 Shunt protection
4.1.2.2 Shunt plus filter protection
4.1.2.3 Surge rating
4.1.2.4 Let-through voltage
4.1.2.5 Residual voltage
4.2 LOCATION OF SPDs
4.2.1 Location of telecommunications line SPDs
4.2.2 Location of power line SPDs
4.2.2.1 Point of entry protection
4.2.2.2 Downstream protection
4.2.2.3 Selective protection
4.3 EQUIPOTENTIAL BONDING
4.3.1 Bonding conductor
4.3.2 Combination unit
4.4 IMPACT OF SPDs ON EQUIPMENT BEING PROTECTED
4.4.1 Impact of power line protection SPDs
4.4.2 Impact of telecommunication line SPDs
4.4.2.1 General
4.4.2.2 Transmission performance
4.4.2.3 Equipment with large energy storage elements in the line interface
4.4.2.4 Selection of protection device
5 SELECTION OF PROTECTION SYSTEMS
5.1 OVERVIEW
5.2 PROTECTION STRATEGIES FOR LINE-POWERED EQUIPMENT
5.3 PROTECTION STRATEGIES FOR MAINS-POWERED EQUIPMENT WITH A TELECOMMUNICATIONS CONNECTION
5.3.1 General protection arrangement
5.3.1.1 Introduction
5.3.1.2 Point of entry protection
5.3.1.3 Protection location decision strategy
5.3.2 No earth
5.3.3 Earth via the GPO
5.3.4 Equipment with hard-wired earth
5.3.5 Equipment with operational insulation
6 INSTALLATION METHODS
6.1 GENERAL
6.1.1 SPD installation requirements
6.1.2 Power earth connectors
6.1.3 Conductor size
6.2 TELECOMMUNICATION LINE SPD INSTALLATION
6.2.1 Location
6.2.2 Device type
6.3 INSTALLATION WITHIN A BD
6.4 MAINS PROTECTION INSTALLATION
6.5 BONDING CONDUCTOR LENGTH
6.6 COMBINATION PROTECTION INSTALLATION
7 MAINTENANCE
7.1 INSPECTION
7.2 FREQUENCY OF INSPECTION
7.3 INSPECTION CHECK LIST
7.3.1 Device damage
7.3.2 Earth reference point
7.3.3 Device earth connection
7.3.4 Earth cable
7.4 RECTIFICATION
7.5 TESTING
APPENDIX A
A1 INTRODUCTION
A1.1 Sources
A1.2 Effects
A1.3 Materials
A1.4 Work practices
A2 ESD OCCURRENCE
A3 EFFECT OF ESD ON EQUIPMENT
A3.1 Mechanism
A3.2 Classes of components
A4 CONTROL OF ESD
A4.1 Standards
A4.2 Levels of protection
A4.2.1 General
A4.2.2 Primary protection
A4.2.3 Secondary protection
A4.2.4 Tertiary protection
Cited references in this standard
[Current]
Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement techniques — Electrostatic discharge immunity test
[Superseded]
Information technology — Generic cabling for customer premises (ISO/IEC 11801:2011, MOD)
[Withdrawn]
Approval and test specification — Safety of information technology equipment including electrical business equipment
Content history
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