Page 468 - 35_DS702_E_2014_Lightning_Protection_Guide

Figure 7.1.2b Lightning protection zone concept according to Figure 7.5.2.9 Lightning current arrester at the transition from LPZ 0 A
IEC 62305-4 (EN 62305-4) . . . . . . . . . . . . . . . . . 189 to LPZ 1. . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Figure 7.3.1 Reduction of the magnetic field by means of grid-like Figure 7.5.3.1 Use of BLITZDUCTOR XT combined arresters . . . . . . . . 205
shields . . . . . . . . . . . . . . . . . . . . . . . . . . . 191 Figure 7.6.2.1 Only one SPD (LPZ 0/1/2) required (LPZ 2 integrated in
Figure 7.3.2a Magnetic field in case of a direct lightning strike in LPZ 1 LPZ 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
(LEMP), IEC 62305-4 (EN 62305-4). . . . . . . . . . . . . 191 Figure 7.6.2.2 DEHNventil M TT 255. . . . . . . . . . . . . . . . . . . . 206
Figure 7.3.2b Magnetic field strength in case of a direct lightning strike Figure 7.6.3.1 Combination guide for Yellow/Line SPD classes (see also
in LPZ 2. . . . . . . . . . . . . . . . . . . . . . . . . . . 191 Figure 7.8.2.2) . . . . . . . . . . . . . . . . . . . . . . . 206
Figure 7.3.3 Volume for electronic devices in LPZ 1 . . . . . . . . . . . 193 Figure 7.7.1.1 Ring equipotential bonding and fixed earthing terminal
Figure 7.3.4 Magnetic field in case of a nearby lightning strike (LEMP), for the connection of metal installations . . . . . . . . . . 208
IEC 62305-4 (EN 62305-4) . . . . . . . . . . . . . . . . . 194 Figure 7.7.2.1 Lightning protection system with spatial shielding and
Figure 7.3.5 Magnetic field in case of a nearby lightning strike (LEMP), coordinated surge protection according to Figure A.1 of
IEC 62305-4 (EN 62305-4) . . . . . . . . . . . . . . . . . 194 IEC 62305-4 (EN 62305-4) . . . . . . . . . . . . . . . . . 208
Figure 7.3.6 Use of the reinforcing rods of a structure for shielding Figure 7.7.2.2 DEHNflex M surge protective device for final circuits . . . 209
and equipotential bonding . . . . . . . . . . . . . . . . . 194 Figure 7.7.2.3 Multipole DEHNguard M TT surge arrester . . . . . . . . . 209
Figure 7.3.7a Galvanised reinforcement mats for shielding the building . 195 Figure 7.7.3.1 Protection of industrial electronic equipment (e.g. a PLC)
Figure 7.3.7b Use of galvanised reinforcement mats for shielding, e.g. by BLITZDUCTOR XT and SPS Protector. . . . . . . . . . . 209
in case of planted roofs. . . . . . . . . . . . . . . . . . . 195 Figure 7.8.1.1 Three-pole DEHNbloc lightning current arrester . . . . . . 210
Figure 7.3.8 Shielding of a building . . . . . . . . . . . . . . . . . . . 195 Figure 7.8.1.2 Multipole DEHNguard M TT surge arrester . . . . . . . . . 210
Figure 7.3.9 Earthing bus conductor / ring equipotential bonding . . . . 196 Figure 7.8.1.3 Modular DEHNventil M TNS combined arrester . . . . . . 210
Figure 7.3.1.1 No shield connection – No shielding from capacitive / Figure 7.8.1.4 Let-through energy curve at the reference varistor with
inductive coupling . . . . . . . . . . . . . . . . . . . . . 197 an upstream spark-gap-based type 1 SPD . . . . . . . . . 211
Figure 7.3.1.2 Shield connection at both ends – Shielding from capa- Figure 7.8.1.5 Let-through energy curve at the reference varistor with
citive / inductive coupling . . . . . . . . . . . . . . . . . . 197 an upstream varistor-based type 1 SPD. . . . . . . . . . . 211
Figure 7.3.1.3 Shield connection at both ends – Solution: Direct and Figure 7.8.2.1 Coordination according to the let-through method of two
indirect shield earthing . . . . . . . . . . . . . . . . . . . 198 surge protective devices and one terminal device, cascade
Figure 7.3.1.4 BLITZDUCTOR XT with SAK BXT LR shield terminal with (according to IEC 61643-22 (CLC/TS 61643-22)) . . . . . . 212
direct or indirect shield earthing . . . . . . . . . . . . . . 198 Figure 7.8.2.2 Examples of the energy-coordinated use of arresters
according to the Yellow/Line SPD class and structure of
Figure 7.3.1.5 Shield connection. . . . . . . . . . . . . . . . . . . . . . 198
the Yellow/Line SPD class symbol. . . . . . . . . . . . . . 213
Figure 7.3.1.6 Shield connection at both ends – Shielding from capa- Figure 8.1.1 Use of arresters in power supply systems (schematic
citive / inductive coupling . . . . . . . . . . . . . . . . . . 198
diagram) . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Figure 7.4.1 Equipotential bonding network in a structure . . . . . . . 199
Figure 8.1.3.1 RCD destroyed by lightning impulse currents. . . . . . . . 221
Figure 7.4.2 Ring equipotential bonding bar in a computer room . . . . 199 Figure 8.1.3.2 “3 – 0” circuit in a TN-C system . . . . . . . . . . . . . . . 221
Figure 7.4.3 Connection of the ring equipotential bonding bar to Figure 8.1.3.3a “4 – 0” circuit in a TN-S system . . . . . . . . . . . . . . . 222
the equipotential bonding network via a fixed earthing
terminal . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Figure 8.1.3.3b “3+1” circuit in a TN-S system . . . . . . . . . . . . . . . 222
Figure 7.4.4 Integration of electronic systems in the equipotential Figure 8.1.3.4 SPDs used in a TN-C-S system . . . . . . . . . . . . . . . 222
bonding network according to IEC 62305-4 (EN 62305-4) 200 Figure 8.1.3.5 SPDs used in a TN-S system . . . . . . . . . . . . . . . . 223
Figure 7.4.5 Combination of the integration methods according to Figure 8.1.3.6 SPDs used in a TN system – Single-family house . . . . . . 223
Figure 7.4.4: Integration in the equipotential bonding Figure 8.1.3.7 SPDs used in a TN system – Office building with separa-
network according to IEC 62305-4 (EN 62305-4) . . . . . 201 tion of the PEN conductor in the main distribution board . 224
Figure 7.5.1.1 Connection of the EBB to the fixed earthing terminal . . . 201 Figure 8.1.3.8 SPDs used in a TN system – Office building with separa-
Figure 7.5.2.1 Transformer outside the structure . . . . . . . . . . . . . 202 tion of the PEN conductor in the sub-distribution board . . 225
Figure 7.5.2.2 Transformer inside the structure (LPZ 0 integrated in Figure 8.1.3.9 SPDs used in a TN system – Industrial building with sepa-
LPZ 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 ration of the PEN conductor in the sub-distribution board . 226
Figure 7.5.2.3 Example of an equipotential bonding system in a struc- Figure 8.1.3.10 SPDs used in a TN system – Arrester with integrated
ture with several entries for the external conductive parts backup fuse in an industrial building. . . . . . . . . . . . 227
and with an inner ring conductor connecting the equi- Figure 8.1.3.11 SPDs used in a TN system – 400/690 V industrial building . 227
potential bonding bars . . . . . . . . . . . . . . . . . . . 202
Figure 8.1.4.1 TT system (230/400 V); “3+1” circuit. . . . . . . . . . . . 228
Figure 7.5.2.4 Internal lightning protection with a common entry point Figure 8.1.4.2 SPDs used in a TT system. . . . . . . . . . . . . . . . . . 228
for all supply lines . . . . . . . . . . . . . . . . . . . . . 203
Figure 8.1.4.3 SPDs used in a TT system – Single-family house . . . . . . 229
Figure 7.5.2.5 Model of the lightning current distribution in case of
several parallel load systems – String topology . . . . . . 203 Figure 8.1.4.4 SPDs used in a TT system – Office building. . . . . . . . . 230
Figure 7.5.2.6 Model of the lightning current distribution in case of Figure 8.1.4.5 SPDs used in a TT system – Industrial building . . . . . . . 231
several parallel load systems – String topology . . . . . . 204 Figure 8.1.5.1 SPDs used in a IT system . . . . . . . . . . . . . . . . . . 232
Figure 7.5.2.7 DEHNventil combined arrester . . . . . . . . . . . . . . . 204 Figure 8.1.5.2a IT system without incorporated neutral conductor; “3 – 0”
Figure 7.5.2.8 Lightning equipotential bonding for power supply and circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
information technology systems situated centrally at one Figure 8.1.5.2b IT system with incorporated neutral conductor;
point . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 “4 – 0” circuit . . . . . . . . . . . . . . . . . . . . . . . . 233

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