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Figure 8.1.5.2c IT system with incorporated neutral conductor; “3+1” Figure 8.2.6 Sparkover performance of a gas discharge tube at
circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 du/dt = 1 kV/µs. . . . . . . . . . . . . . . . . . . . . . . 246
Figure 8.1.5.3 SPDs used in a 690 V IT system – Without incorporated Figure 8.2.7 Test setup for determining the limiting voltage in case of
neutral conductor. . . . . . . . . . . . . . . . . . . . . . 233 nominal discharge currents. . . . . . . . . . . . . . . . . 247
Figure 8.1.5.4 SPDs used in a 230/400 V IT system – With incorporated Figure 8.2.8 Limiting voltage in case of nominal discharge currents . . 247
neutral conductor (3+1 circuit) . . . . . . . . . . . . . . . 234 Figure 8.2.9 Nominal current of BLITZDUCTOR XT. . . . . . . . . . . . 247
Figure 8.1.6.1 Surge protective devices connected in series . . . . . . . . 235 Figure 8.2.10 Typical frequency response of a BLITZDUCTOR XT . . . . . 247
Figure 8.1.6.2 Principle of the two-conductor terminal (single-pole unit) . 235
Figure 8.2.11 Building with external lightning protection system and
Figure 8.1.6.3 STAK 2X16 and STAK 25 pin-shaped terminals. . . . . . . 235 cables installed outside the building according to the
Figure 8.1.6.4a Connection of surge pro tective devices in the cable branch 235 lightning protection zone concept . . . . . . . . . . . . . 248
Figure 8.1.6.4b Limiting voltage of DEHNguard 275 in case of different Figure 8.2.12 Building without external lightning protection system
connecting cable lengths . . . . . . . . . . . . . . . . . . 235 and cables installed outside the building. . . . . . . . . . 248
Figure 8.1.6.5 DEHNbloc Maxi S: Coordinated lightning current arrester Figure 8.2.13 Building with external lightning protection system and
with integrated backup fuse for busbars . . . . . . . . . . 236 cables installed inside the building according to the
Figure 8.1.6.6 DEHNguard modular CI: Type 2 surge arrester with lightning protection zone concept . . . . . . . . . . . . . 248
integrated backup fuse . . . . . . . . . . . . . . . . . . . 236 Figure 8.2.14 Building without external lightning protection system
Figure 8.1.6.7 Recommended maximum cable lengths of surge and cables installed inside the building . . . . . . . . . . 248
protective devices in the cable branch (IEC 60364-5-53 Figure 8.2.15 Block diagram for the temperature measurement . . . . . 250
(HD 60364-5-534)) . . . . . . . . . . . . . . . . . . . . . 236
Figure 8.2.1.1 Optocoupler – Schematic diagram . . . . . . . . . . . . . 252
Figure 8.1.6.8a Unfavourable cable routing from the consumer’s point Figure 8.2.2.1 Levels of building automation . . . . . . . . . . . . . . . 253
of view . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Figure 8.2.3.1 Generic cabling structure. . . . . . . . . . . . . . . . . . 254
Figure 8.1.6.8b Favourable cable routing from the consumer’s point of
view . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236 Figure 8.2.3.2 Lightning interference on the IT cabling . . . . . . . . . . 255
Figure 8.1.6.9 Arrangement of surge protective devices in an installation Figure 8.2.4.1 Calculation of L 0 and C 0 . . . . . . . . . . . . . . . . . . 257
and the resulting effective cable length . . . . . . . . . . 237 Figure 8.2.4.2 Intrinsically safe BXT ML4 BD EX 24 arrester. . . . . . . . 258
Figure 8.1.6.10 Series connection. . . . . . . . . . . . . . . . . . . . . . 238 Figure 8.2.4.3 SPDs in intrinsically safe bus systems – Insulation
Figure 8.1.6.11 Series connection of the DEHNventil M TNC combined strength > 500 V a.c. . . . . . . . . . . . . . . . . . . . . 259
arrester by means of a busbar . . . . . . . . . . . . . . . 238 Figure 8.2.5.1 Correct installation . . . . . . . . . . . . . . . . . . . . . 260
Figure 8.1.6.12 Parallel connection . . . . . . . . . . . . . . . . . . . . . 238 Figure 8.2.5.2 Most common installation . . . . . . . . . . . . . . . . . 260
Figure 8.1.6.13 Cable routing . . . . . . . . . . . . . . . . . . . . . . . . 239 Figure 8.2.5.3 Incorrectly established equipotential bonding . . . . . . . 261
Figure 8.1.7.1 One-port SPD . . . . . . . . . . . . . . . . . . . . . . . . 239 Figure 8.2.5.4 Incorrect conductor routing. . . . . . . . . . . . . . . . . 261
Figure 8.1.7.2 Two-port SPD. . . . . . . . . . . . . . . . . . . . . . . . 239 Figure 8.2.5.5 Separation of cables in cable duct systems. . . . . . . . . 262
Figure 8.1.7.3 Through-wired one-port SPD . . . . . . . . . . . . . . . . 239 Figure 8.2.6.1 Ageing of electronic components – “Bath tub curve” . . . 263
Figure 8.1.7.4 Example: DEHNventil M TNC 255. . . . . . . . . . . . . . 240 Figure 8.2.6.2 LifeCheck arrester testing by means of DRC LC M1+ . . . 263
Figure 8.1.7.5 Example: DEHNguard M TNC/TNS/TT. . . . . . . . . . . . 240 Figure 8.2.6.3 Monitoring of surge protective devices by means of the
Figure 8.1.7.6 Example: DEHNrail . . . . . . . . . . . . . . . . . . . . . 241 DRC MCM XT condition monitoring unit . . . . . . . . . . 264
Figure 8.1.7.7 Performance of NH fuses when subjected to impulse Figure 9.1.1 Basic principle of a frequency converter . . . . . . . . . . 267
currents (10/350 µs) . . . . . . . . . . . . . . . . . . . . 241 Figure 9.1.2 EMC-compatible shield connection of the motor feeder
Figure 8.1.7.8 Current and voltage of a melting 25 A NH fuse when cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
subjected to impulse currents (10/350 µs) . . . . . . . . . 241
Figure 8.1.7.9 Use of a separate backup fuse for surge protective devices . 241 Figure 9.1.3 Frequency converter with drives in LPZ 0 A and LPZ 1. . . . 268
Figure 9.2.1 Standing surface insulation to reduce the risk of touch
Figure 8.1.7.10 Reduction of the follow current by means of the patented voltage in case of a lightning strike to a lamp pole. . . . . 271
RADAX Flow principle . . . . . . . . . . . . . . . . . . . 242
Figure 9.2.2 Potential control to reduce step voltage in case of a
Figure 8.1.7.11 Follow current disconnection selectivity of DEHNventil M lightning strike to a lamp pole . . . . . . . . . . . . . . . 271
with respect to NH fuse links with different rated currents . 242
Figure 9.2.3 Outdoor lighting system in the form of a 230 V wall lamp
Figure 8.1.8.1 DEHNguard M TNC CI 275 FM – Type 2 arrester with in lightning protection zone 0 A with lightning equipoten-
integrated backup fuse . . . . . . . . . . . . . . . . . . . 243
tial bonding at the entrance point into the building . . . . 272
Figure 8.1.8.2 Inner structure of the DEHNguard M/S … CI (front and Figure 9.2.4 Outdoor lighting system in the form of a 3x 230/400 V
rear view). . . . . . . . . . . . . . . . . . . . . . . . . . 243
lamp pole in lightning protection zone 0 A with lightning
Figure 8.1.8.3 Considerably reduced space requirements – Com parison equipotential bonding at the entrance point into the
of the installation space of a conventional type 1 arrester building. . . . . . . . . . . . . . . . . . . . . . . . . . . 272
with that of DEHNvenCI . . . . . . . . . . . . . . . . . . 243
Figure 9.2.5 Outdoor lighting system in the form of a 230 V wall lamp
Figure 8.2.1 SPD classification. . . . . . . . . . . . . . . . . . . . . . 244 in lightning protection zone 0 B . . . . . . . . . . . . . . . 272
Figure 8.2.2 Limiting performance. . . . . . . . . . . . . . . . . . . . 245 Figure 9.3.1 System overview of a biogas plant . . . . . . . . . . . . . 275
Figure 8.2.3 Special applications . . . . . . . . . . . . . . . . . . . . 245 Figure 9.3.2 DEHNiso Combi system used to protect a fermenter with
Figure 8.2.4 Nominal voltage and reference. . . . . . . . . . . . . . . 245 foil roof. . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Figure 8.2.5 Test setup for determining the limiting voltage at a rate Figure 9.3.3 Protection of a fermenter with a foil roof by means of
of voltage rise du/dt = 1 kV/µs . . . . . . . . . . . . . . . 246 telescopic lightning protection masts. . . . . . . . . . . . 277

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