AS 4262.2-1999

Telecommunication overvoltages Protection of equipment

Standards Australia

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1 - AS 4262.2-1999 TELECOMMUNICATION OVERVOLTAGES - PROTECTION OF EQUIPMENT
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 APPLICATION
6 - 1.3 REFERENCED DOCUMENTS
8 - 1.4 DEFINITIONS
8 - 1.4.1 Communications earth terminal
8 - 1.4.2 Overcurrent
8 - 1.4.3 Primary protection
8 - 1.4.4 Secondary protection
8 - 1.4.5 Surge protective device
8 - 1.5 ABBREVIATIONS
9 - SECTION 2 PRINCIPLES
9 - 2.1 SOURCES OF OVERVOLTAGES AND OVERCURRENTS
9 - 2.1.1 General
9 - 2.1.2 Telecommunications lines
9 - 2.1.3 Power lines
10 - 2.1.4 Earth potential rise
10 - 2.1.5 Wiring induction loops
11 - 2.1.6 Electrostatic discharges (ESDs)
11 - 2.1.7 Electrical fast transient (EFT)
11 - 2.1.8 Other immunity issues
12 - 2.2 EFFECTS OF OVERVOLTAGES AND OVERCURRENTS
12 - 2.2.1 Equipment damage
12 - 2.2.2 Equipment mis-operation
12 - 2.2.3 Equipment lock-up
12 - 2.3 PRINCIPLES OF PROTECTION
12 - 2.3.1 Inherent (built-in) resistibility
12 - 2.3.2 Shunt (overvoltage protection) components
12 - 2.3.3 Series (overcurrent protection) components
12 - 2.3.4 Isolation devices
12 - 2.3.5 Equipotential bonding
13 - 2.3.6 Shielding
13 - 2.3.7 Wiring layout
13 - 2.3.8 Filtering
13 - 2.3.9 Location of SPDs
14 - SECTION 3 ASSESSMENT OF NEED FOR PROTECTION
14 - 3.1 CATEGORIES OF TELECOMMUNICATIONS EQUIPMENT
14 - 3.1.1 General
14 - 3.1.2 Line-powered equipment
15 - 3.1.3 Mains-powered equipment without an earth
15 - 3.1.4 Mains-powered equipment with a GPO earth
15 - 3.1.5 Mains-powered equipment with an earth provided by a telecommunication reference conductor (TRC) or a communications earth
15 - 3.2 SUSCEPTIBILITY OF CUSTOMER EQUIPMENT TO DAMAGE
15 - 3.2.1 Line-powered equipment
15 - 3.2.2 Mains-powered double-insulated equipment without an earth
15 - 3.2.3 Mains-powered equipment with a GPO earth
16 - 3.2.4 Mains-powered equipment with a hard-wired earth
16 - 3.3 COST AND IMPORTANCE OF THE EQUIPMENT
16 - 3.4 ENVIRONMENT
16 - 3.5 ASSESSMENT OF THE NEED FOR PROTECTION
19 - SECTION 4 PROTECTION SYSTEMS
19 - 4.1 PROTECTION SYSTEMS COMPONENTS
19 - 4.1.1 Telecommunications line SPDs
20 - 4.1.2 Power line SPDs
21 - 4.2 LOCATION OF SPDs
21 - 4.2.1 Location of telecommunications line SPDs
22 - 4.2.2 Location of power line SPDs
22 - 4.3 EQUIPOTENTIAL BONDING
22 - 4.3.1 Bonding conductor
23 - 4.3.2 Combination unit
23 - 4.4 IMPACT OF SPDs ON EQUIPMENT BEING PROTECTED
23 - 4.4.1 Impact of power line protection SPDs
23 - 4.4.2 Impact of telecommunication line SPDs
25 - SECTION 5 SELECTION OF PROTECTION SYSTEMS
25 - 5.1 OVERVIEW
25 - 5.2 PROTECTION STRATEGIES FOR LINE-POWERED EQUIPMENT
25 - 5.3 PROTECTION STRATEGIES FOR MAINS-POWERED EQUIPMENT WITH A TELECOMMUNICATIONS CONNECTION
25 - 5.3.1 General protection arrangement
27 - 5.3.2 No earth
28 - 5.3.3 Earth via the GPO
29 - 5.3.4 Equipment with hard-wired earth
30 - 5.3.5 Equipment with operational insulation
31 - SECTION 6 INSTALLATION METHODS
31 - 6.1 GENERAL
31 - 6.1.1 SPD installation requirements
31 - 6.1.2 Power earth connectors
31 - 6.1.3 Conductor size
31 - 6.2 TELECOMMUNICATION LINE SPD INSTALLATION
31 - 6.2.1 Location
31 - 6.2.2 Device type
31 - 6.3 INSTALLATION WITHIN A BD
31 - 6.4 MAINS PROTECTION INSTALLATION
32 - 6.5 BONDING CONDUCTOR LENGTH
32 - 6.6 COMBINATION PROTECTION INSTALLATION
33 - SECTION 7 MAINTENANCE
33 - 7.1 INSPECTION
33 - 7.2 FREQUENCY OF INSPECTION
33 - 7.3 INSPECTION CHECK LIST
33 - 7.3.1 Device damage
33 - 7.3.2 Earth reference point
33 - 7.3.3 Device earth connection
33 - 7.3.4 Earth cable
33 - 7.4 RECTIFICATION
33 - 7.5 TESTING
34 - APPENDIX A - ELECTROSTATIC DISCHARGE
34 - A1 INTRODUCTION
34 - A1.1 Sources
34 - A1.2 Effects
34 - A1.3 Materials
34 - A1.4 Work practices
34 - A2 ESD OCCURRENCE
35 - A3 EFFECT OF ESD ON EQUIPMENT
35 - A3.1 Mechanism
35 - A3.2 Classes of components
35 - A4 CONTROL OF ESD
35 - A4.1 Standards
35 - A4.2 Levels of protection

Abstract

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.

Scope

This Standard sets out guidelines and specifies requirements for the protection from overvoltages and overcurrents of equipment connected over twisted pair to telecommunication networks. It provides a means of assessing the need for protection, information on protection techniques and the methods of implementing these techniques.
This Standard is not intended for the protection of persons and does not apply within the carriers' networks.