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