Inducting effect during lightning strikes

User Manual SICLOCK GPS1000

4.3. Inducting effect during lightning strikes

Another important parameter influencing the choice of antenna location is the induction effect which arises from lightning conductors or building parts where lightning current flows through.

When the lightning hits into a lightning conductor, within a few hundred nanoseconds, voltages of several megavolts are built up, which result in conducted currents up to several 10000 amps with correspondingly steep surge pulse edges (depending on the inductive resistance of the lightning conductor). Leading to powerful elec- trical fields which at a 2 meter distance to the antenna or antenna cable produce induction voltages in the kilo- volt range.

Furthermore, when the distance is too short, there is a danger of flashover from the lightning conductor to parts of the antenna unit.

4.4. Choosing a safe location

Keeping in mind the the previous chapter and the safety against lightning strikes, the following facts should be taken into account when choosing a antenna location.

1.Antenna and antenna cable should always be installed at least 2 meters away from lightning conductors and areas in danger of being struck by lightning in conformity with Fig 7 and Fig 8 and in the green area. Never in the red area!!!

2.Install the antenna cable the shortest possible way from the antenna to the inside of the building.

3.Install the antenna cable orthogonal to lightning conductors nearby, because the induction effect is then minimal.

4.The 2m distance from lightning conductors to antenna cables shall be en- forced also inside the building, because an electrical breakthroug can occur even through a wall.

5.Install the lightning protection module at the inside of the building as close as possible to the entry point of the antenna cable.

4.5. Installation of the lightning protection module 2XV9450-1AR83

The lightning protection module 2XV9450-1AR83 (not included in the scope of delivery of SICLOCK GPS1000) consists of a base part and a lightning conductor module which can be plugged into this basis. The basis part is connected to the earth cable via the DIN rail supplied with the unit. Basically, it should be installed inside the building, as close as possible to the entry point of the antenna cable. Ideally there should be a straight connec- tion lead to the earth foundation electrode.

Several changes of direction, tight bends and coiling up the cable previous to the earth foundation electrode are extremely adveresly to the conduction effect.

For details of installation, please see the manual enclosed with the lightning protection module.

Order numberr 2XV9450-1AR82-BA

Version 2.0

2XV9450-1AR82 specifications

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