Installation of a satellite system

Ok, and how do I find out which of the 9 cables are the 4 that come from the SAT system? Or does it not matter to the Multi Switch?

The multi-switch doesn’t ignore anything. With the 4 cables coming from the LNB, it is even important in which order the input connections are plugged in. You wanted to hire a professional anyway. They will find out easily with the right equipment.

Well, first you have to find out where what goes, what about the installer of the system? Did that person leave no documentation at all?

Then you can clarify whether a multiswitch is necessary or not.

Even if it seems simple, you can do a lot wrong...

Grounding and equipotential bonding are integral parts of the electrical system and installations on it according to NAV § 13 are reserved for electrical specialists licensed by a VNB.

It is also unfortunately true that not every electrical specialist can reliably prove a VDE selection subscription contractually and is truly competent regarding antenna grounding and equipotential bonding.

it already starts with the choice of the cable... e.g. 16 sqmm in fine-wire design is not allowed and there are even more stumbling blocks...

Here is one of the occasions for a layman or professional to stumble technically:

11.3.2 Grounding Conductor
According to EN 50164-1 and EN 50164-2, terminals and wires must be designed for lightning currents.

A 16 mm² copper wire withstands a LEMP with 200 kA subject to certified terminals for this purpose, but a chain is only as strong as its weakest link. Currently, there is no roof rafter clamp certified with an old or new test standard Class H = 100 kA terminal and the most commonly used main grounding bars are only designed for heavy current application.

Good thing I have a wall mount

Good thing I have a wall mount

With less than 2 m distance below the gutter or roof edge and from 1.5 m wall distance, facade antennas with at least 16 mm² Cu, 25 mm² aluminum or 50 mm² must also be grounded. Only if the antenna and cables

[*]remain within the protection zone, [*]only one residential unit is connected, and [*]the leakage currents of the connected end devices are < 3.5 mAeff,

since 2011, aside from lightning current-capable grounding of the wall mount, the equipotential bonding of the cable shields is also left to discretion. That one should not get too close to rainwater downpipes, gutters, etc., which are prone to lightning strikes and can couple lightning currents into the protection zone, is considered obvious and is not explicitly mentioned in DIN EN 60728-11 (VDE 0855-1). In new buildings with ETICS, wall mounts fastened with THERMAX without thermal bridging are statically less load-bearing than rafter mounts.