AS 4262.1-1995

1-AS 4262.1-1995 TELECOMMUNICATION OVERVOLTAGES - PROTECTION OF PERSONS
4-PREFACE
5-CONTENTS
6-FOREWORD
7-SECTION 1 - SCOPE AND GENERAL
7-1.1 SCOPE
7-1.2 APPLICATION
7-1.3 REFERENCED DOCUMENTS
7-1.4 DEFINITIONS
7-1.4.1 Bonding conductor
8-1.4.2 Building
8-1.4.3 Carrier
8-1.4.4 Customer cabling
8-1.4.5 Intermediate distribution frame (IDF)
8-1.4.6 Main distribution frame (MDF)
8-1.4.7 Overvoltage
8-1.4.8 Telecommunication facilities
8-1.4.9 Three-electrode gas-filled surge suppression device
8-1.4.10 User environment
9-SECTION 2 - PRINCIPLES
9-2.1 GENERAL CONSIDERATIONS FOR PROTECTION
9-2.1.1 Overvoltages in the user environment
10-2.1.2 Protection concepts
10-2.1.3 Protection using an electrical insulation barrier
10-2.1.4 Protection using potential equalization
10-2.1.5 Effective user protection
11-2.2 PROTECTION OF USERS
11-2.2.1 Equipment protection
11-2.2.2 Additional protection
11-2.2.3 Overvoltage reduction
13-SECTION 3 - ANALYSIS OF PROTECTION AGAINST LIGHTNING OVERVOLTAGES
13-3.1 GENERAL
13-3.2 FACTORS AFFECTING LIGHTNING INCIDENT PROBABILITY
17-SECTION 4 - PROTECTION SYSTEMS
18-SECTION 5 - INSTALLATION METHODS
18-5.1 GENERAL
18-5.1.1 Surge suppression device installation requirements
18-5.1.2 Power earth connectors
18-5.1.3 Conductor size
18-5.1.4 Bonding methods
18-5.2 MDF/ IDF INSTALLATIONS
18-5.2.1 Installation
18-5.3 DOMESTIC AND NON-MDF/ IDF INSTALLATIONS
18-5.3.1 Installation
18-5.3.2 Surge suppression device location
18-5.4 INSTALLATIONS NOT CONNECTED TO THE SUPPLY AUTHORITY MAINS
18-5.4.1 Installation types
19-5.4.2 Elements of the installation
22-APPENDIX A - SOURCES OF OVERVOLTAGE AND MODES OF ENTRY
22-A1 INTRODUCTION
22-A2 OVERVOLTAGE DUE TO LIGHTNING
22-A2.1 Strike to the environment
23-A2.2 Introduced via telephone lines
23-A2.3 Introduced via electricity service
23-A3 POWER SYSTEM DISTURBANCE
24-A3.1 Electrical contact with power plant
24-A3.2 Fault currents on HV transmission lines
25-A3.3 Earth potential rise
25-A3.4 Switching surges
25-A3.5 Follow through currents
26-APPENDIX B - LIGHTNING HAZARDS AND SELF-HELP PROTECTION
26-B1 LIGHTNING HAZARD
26-B2 SELF- HELP PROTECTION
26-B3 FIRST AID