1 General considerations
1.1 Origin of dangerous overvoltages and overcurrents
1.2 Methods of protection
1.3 Types of protective devices
1.4 Residual effects
1.5 Assessment of risk
1.6 Decision on protection
2
Protection of lines
2.1 Protective measures external to the conductors themselves
2.2 Special cables
2.3 Use of protective devices
2.4 Installation of protective devices
2.5 Planning of works
2.6 Recommended policy
3
Protection of exchange and transmission equipment
3.1 Need for protection external to the equipment
3.2 Need for equipment to have a minimum level of electrical
robustness
3.3 Effect of switching conditions
4
Protection of subscribers’ terminal equipment
4.1 Degree of exposure
4.2 Dielectric strength
4.3 Use of protectors
4.4 Common bonding
4.5 High isolation technique
4.6 National regulations
4.7 High cost of maintenance of subscribers’ installations
References
Annex A – Definition of terms associated with protection