Provides guidelines for the protection of persons and property from the hazards of lightning. Applies to conventional lightning protection systems consisting of air terminations, downconductors, earthing systems and surge protective devices. Also provides a comprehensive risk management process for the determination of the risk of damage due to lightning for a range of structures.
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 INTRODUCTION
1.4 REFERENCED DOCUMENTS
1.5 DEFINITIONS
2 ASSESSMENT AND MANAGEMENT OF RISK DUE TO LIGHTNING—ANALYSIS OF NEED FOR PROTECTION
2.1 INTRODUCTION
2.2 SCOPE OF SECTION
2.3 CONCEPT OF RISK
2.3.1 General considerations
2.3.2 Types of risk due to lightning
2.3.3 Tolerable values of risk
2.4 DAMAGE DUE TO LIGHTNING
2.4.1 Sources of damage
2.4.2 Types of damage
2.4.3 Consequences of damage (types of loss)
2.5 RISKS DUE TO LIGHTNING
2.5.1 Risk components
2.5.2 Calculation of risk components
2.6 PROCEDURE FOR RISK ASSESSMENT AND MANAGEMENT
2.6.1 Procedure for risk assessment
2.6.2 Protection against direct lightning strikes if Rd > Ra
2.6.3 Protection against indirect lightning strikes if Rd ≤ Ra but Ri > Ra
2.6.4 Final check if Rd + Ri > Ra
2.7 RISK MANAGEMENT CALCULATION TOOL
2.7.1 General operation
2.7.2 Using the calculation tool in the risk management procedure
3 PRECAUTIONS FOR PERSONAL SAFETY
3.1 SCOPE OF SECTION
3.2 NEED FOR PERSONAL PROTECTION
3.3 PERSONAL CONDUCT
3.3.1 General
3.3.2 Outdoors
3.3.3 Indoor and outdoor swimming pools
3.3.4 Indoors
3.4 EFFECT ON PERSONS AND TREATMENT FOR INJURY BY LIGHTNING
4 PROTECTION OF STRUCTURES
4.1 SCOPE OF SECTION
4.2 PROTECTION LEVEL
4.3 LPS DESIGN RULES
4.3.1 General
4.3.2 Rules for air terminals
4.3.3 Rules for downconductors
4.3.4 Rules for earth terminations
4.4 ZONES OF PROTECTION FOR LIGHTING INTERCEPTION
4.4.1 Basis of recommendations
4.4.2 Rolling sphere method (with a modification for large flat surfaces)
4.5 METHODS OF PROTECTION
4.5.1 Structural steel-framed buildings
4.5.2 Buildings without structural steel frames
4.5.2.1 General
4.5.2.2 Structures with continuous metal
4.5.2.3 Metal-roofed buildings
4.5.2.4 Reinforced concrete buildings
4.5.3 Structures with flammable or explosive atmosphere
4.6 MATTERS TO BE CONSIDERED WHEN PLANNING PROTECTION
4.6.1 Structures to be erected
4.6.2 Design considerations
4.6.2.1 General considerations
4.6.2.2 Route for conductors
4.6.2.3 Trouble-free installation
4.6.2.4 Economy of installation
4.7 MATERIALS
4.7.1 General
4.7.2 Corrosion
4.7.2.1 Basic considerations
4.7.2.2 Air terminals and downconductors
4.7.2.3 The earth termination network
4.8 FORM AND SIZE OF CONDUCTORS
4.8.1 Factors influencing selection
4.8.2 Electrical and thermal considerations
4.8.3 Mechanical strength and corrosion considerations
4.9 JOINTS
4.9.1 Effectiveness of joints
4.9.2 Protective covering
4.10 FASTENERS
4.11 AIR TERMINALS
4.11.1 General requirements
4.11.2 Protection of roofs
4.11.3 Protection of the sides of tall buildings
4.11.3.1 Influence of forms of construction
4.11.3.2 Curtain wall construction
4.12 DOWNCONDUCTORS
4.12.1 Structures—General
4.12.2 Route
4.12.3 Mechanical damage
4.13 TEST LINKS
4.14 EARTH TERMINATIONS
4.14.1 General principles
4.14.2 Earthing resistance
4.14.2.1 Basis for measurements
4.14.2.2 Recommended values
4.14.3 Common earthing electrode and potential equalization
4.14.3.1 Common earthing electrode
4.14.3.2 Communications earths
4.15 EARTHING ELECTRODES
4.15.1 General considerations
4.15.2 Connections to earthing electrodes
4.15.2.1 Mechanical protection
4.15.2.2 Selection of materials
4.15.2.3 Joints
4.15.2.4 Test links
4.15.3 Inspection and testing of earthing electrodes
4.16 METAL IN AND ON A STRUCTURE
4.16.1 Use of metal in or on a structure as a part of the lightning protection system
4.16.2 Prevention of side-flashing
4.16.2.1 Methods of prevention
4.16.2.2 Bonding
4.16.2.3 Isolation
4.16.2.4 Effects of bonding on cathodically-protected metal
4.16.2.5 Bonding of underground services
5 PROTECTION OF PERSONS AND EQUIPMENT WITHIN BUILDINGS
5.1 SCOPE OF SECTION
5.2 NEED FOR PROTECTION
5.3 MODES OF ENTRY OF LIGHTNING IMPULSES
5.4 GENERAL CONSIDERATIONS FOR PROTECTION
5.5 PROTECTION OF PERSONS WITHIN BUILDINGS
5.5.1 Objectives of protection
5.5.2 Installation of equipotential bonding
5.6 PROTECTION OF EQUIPMENT
5.6.1 General
5.6.2 Equipotential bonding for equipment protection
