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5.2.3 Down conductors of an isolated external light- 6 Internal lightning protection � � � � � 176
ning protection system. . . . . . . . . . . . . 100 6.1 Equipotential bonding for metal installations . 177
5.2.4 High voltage-resistant, insulated down con- 6.1.1 Minimum cross-section for equipotential
ductor – HVI Conductor . . . . . . . . . . . . 100 bonding conductors according to IEC 62305-3
5.3 Materials and minimum dimensions for air- (EN 62305-3). . . . . . . . . . . . . . . . . . 180
termination and down conductors . . . . . . . 109 6.2 Equipotential bonding for power supply
5.4 Mounting dimensions for air-termination sys- systems . . . . . . . . . . . . . . . . . . . . 180
tems and down conductors . . . . . . . . . . 110 6.3 Equipotential bonding for information techno-
5.4.1 Changes in length of metal wires . . . . . . . 111 logy systems . . . . . . . . . . . . . . . . . . 181
5.4.2 External lightning protection system for an 7 Protection of electrical and electronic
industrial and residential building . . . . . . . 113 systems against LEMP � � � � � � � � � 186
5.4.3 Instructions for mounting roof conductor 7.1 Lightning protection zone concept. . . . . . . 187
holders . . . . . . . . . . . . . . . . . . . . . 115
7.2 SPM management . . . . . . . . . . . . . . . 190
5.5 Earth-termination systems . . . . . . . . . . . 118
7.3 Calculation of the magnetic shield attenuation
5.5.1 Earth-termination systems in accordance with of building / room shields. . . . . . . . . . . . 191
IEC 62305-3 (EN 62305-3) . . . . . . . . . . . 127
7.3.1 Cable shielding. . . . . . . . . . . . . . . . . 196
5.5.2 Earth-termination systems, foundation earth 7.4 Equipotential bonding network . . . . . . . . 199
electrodes and foundation earth electrodes for
special structural measures . . . . . . . . . . . 129 7.5 Equipotential bonding at the boundary of
5.5.3 Ring earth electrodes – Type B earth electrodes 139 LPZ 0 A and LPZ 1. . . . . . . . . . . . . . . . 201
7.5.1 Equipotential bonding for metal installations . 201
5.5.4 Earth rods – Type A earth electrodes . . . . . 140
7.5.2 Equipotential bonding for power supply
5.5.5 Earth electrodes in rocky ground. . . . . . . . 141
systems . . . . . . . . . . . . . . . . . . . . . 202
5.5.6 Meshed earth-termination systems . . . . . . 141
7.5.3 Equipotential bonding for information techno-
5.5.7 Corrosion of earth electrodes . . . . . . . . . 142 logy systems . . . . . . . . . . . . . . . . . . 205
5.5.7.1 Earth-termination systems with a special focus 7.6 Equipotential bonding at the boundary of
on corrosion . . . . . . . . . . . . . . . . . . 142 LPZ 0 A and LPZ 2. . . . . . . . . . . . . . . . 206
5.5.7.2 Formation of galvanic cells, corrosion . . . . . 144 7.6.1 Equipotential bonding for metal installations . 206
5.5.7.3 Selection of earth electrode materials . . . . . 147 7.6.2 Equipotential bonding for power supply
5.5.7.4 Combination of earth electrodes made of systems . . . . . . . . . . . . . . . . . . . . 206
different materials . . . . . . . . . . . . . . . 147 7.6.3 Equipotential bonding for information tech-
5.5.7.5 Other anti-corrosion measures. . . . . . . . . 149 nology systems. . . . . . . . . . . . . . . . . 207
5.5.8 Materials and minimum dimensions of earth 7.7 Equipotential bonding at the boundary of
electrodes . . . . . . . . . . . . . . . . . . . 149 LPZ 1 and LPZ 2 and higher . . . . . . . . . . 207
5.6 Electrical isolation of the external lightning 7.7.1 Equipotential bonding for metal installations . 207
protection system – Separation distance. . . . 149 7.7.2 Equipotential bonding for power supply
5.7 Step and touch voltage . . . . . . . . . . . . 155 systems . . . . . . . . . . . . . . . . . . . . 208
5.7.1 Coping with touch voltage at the down con- 7.7.3 Equipotential bonding for information techno-
ductors of a lightning protection system. . . . 158 logy systems . . . . . . . . . . . . . . . . . . 209
5.7.2 Optimisation of lightning protection earthing 7.8 Coordination of the protection measures at
considering step voltage aspects. . . . . . . . 160 different LPZ boundaries . . . . . . . . . . . . 210
5.8 Manufacturer’s test of lightning protection 7.8.1 Power supply systems . . . . . . . . . . . . . 210
components . . . . . . . . . . . . . . . . . . 164 7.8.2 Information technology systems . . . . . . . . 212
5.9 Dimensioning of earth-termination systems for 7.9 Inspection and maintenance of the LEMP pro-
transformer stations . . . . . . . . . . . . . . 168 tection measures system. . . . . . . . . . . . 214

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