Planning empty conduits for satellite system and photovoltaic system

In our construction, it is no problem at all from the architect’s side to make your own arrangements and pay on your own account with an electrician.
Is it contractually prohibited anywhere for you to enter the construction site?
Usually, the executing company has the right of domicile, yes. I can ban the general contractor (GU). But as long as he doesn’t issue a removal order and it isn’t forbidden to enter the construction site, you can easily lay two conduits there after working hours.
That sounds quite harsh. And it would also be harsh if the GU issued you a removal order because of doing work on your own. It is common for builders to do some work on their own construction site.
At this point, the obligation to register temporary workers with the statutory accident insurance should be noted.

You mentioned a supply shaft and you only spoke of two empty conduits.
Get “Fränkische” conduits, lay them yourself, clamp them firmly or use cable ties, done. It probably costs 30 minutes of work and 30€ for the conduits.

If it’s about more than just the empty conduits, as the previous speakers have pointed out, then definitely speak with an electrician beforehand/immediately about what needs to be done.
Also ask the GU what is included in the €900 service and critically question how two plastic conduits in an already existing shaft could cost so much more.

Alternatively: Who is doing the photovoltaics? They should lay the conduit as well. Request a price.
Or, contact the electrician directly. If these are not dubious companies, something will definitely be doable.

It's not quite that simple

Exactly. Therefore, ask an electrician. The note referred to the positions of the empty conduits relative to each other. The lightning protection/grounding cable must run directly and shortest route from the antenna mast/wall mount to the main grounding bar (HES) of the house and must not be laid alongside other cables. The coaxial cables must also be grounded. However, this has little to do with the topic "planning empty conduits for satellite system and photovoltaic system".

Since I accidentally stumbled into the old topic through a cross-reference, I have decided to comment on some remarks regarding desecration of corpses.

Coaxial cables must also be grounded. However, this has little to do with the topic "Planning empty conduits for satellite system and photovoltaic system."

Correct, but nevertheless the topic drifted to antenna grounding and PA and contains both normatively outdated and false claims.

[*]The temporary decoupling from the lightning protection standards in the two standards for antenna safety with the ban on multi-wire grounding conductors was a misstep, which was already revoked for radio transmitting/receiving antennas with DIN VDE 0800-300: 2002-07 and for receiving antennas for inexplicable reasons only much later with DIN EN 60728-11 (VDE 0855-1): 2010-11.
[*]At the time of this thread, multi-wire grounding conductors had therefore already been permitted again for 6.5 years.
[*]Since abandoning this error, it applies that connectors for individual grounding conductors must be certified according to test standard class H = 100 kA, regardless of whether the wire is solid or multi-wire made of 16 mm² Cu, 25 mm² aluminum, or 50 mm² steel. Because grounding conductors that could in principle also discharge rare monster lightning > 200 kA require connectors with a tested lightning current carrying capacity according to the highest test class H = 100 kA for their intended function.
[*]Although lightning currents on usually only one grounding conductor of antennas are at least as dangerous as on at least two down conductors of lightning protection systems, compliance with separation distances calculated according to IEC 62305-3 is normatively only required for lightning protection systems and connected metallic building parts.
[*]The external down conductor depicted in all previous example images of old and current standard editions for conventional direct grounding along with the additional deep earth electrode despite the foundation earth electrode are both optional.
[*]If an additional support earth electrode is installed, it must in principle be connected to other earth electrodes and the equipotential bonding.

CONCLUSION:

[*]Compliance with norm-compliant separation distances and avoidance of dangerous proximities makes sense both for antenna grounding and potentially lightning current stressed strings of photovoltaic systems and functional grounding conductors of support structures but is NOT normatively required without LPS.
[*]If St. Florian fails, lightning currents from objectively rare direct strikes use all paths to earth and are not limited to grounding and equipotential bonding conductors but also affect coaxial cables and strings.
[*]On the one hand, laying antenna grounding outside only and on the other hand laying photovoltaic cables together with functional grounding conductors inside as lightning highways without separation distance is nonsensical from a lightning protection perspective.
[*]Anyone who wants to exclude coupling of partial lightning currents into antenna and photovoltaic systems as best as possible must not ground directly but must extensively minimize strikes to protectable roof structures according to the state of the art with separate air-termination systems.
[*]Sufficiently insulating separation distances are usually not possible with internal down conductors, and unspecified distances between the two empty conduits discussed here provide no safety gain.
[*]The VDE publication series #6 from 2005, in which direct grounding to LPS was still propagated and arbitrary separation distances of 0.30 m in air and 0.60 m through solid materials were recommended, as well as a general protection angle of 45°, are lightning protection-wise long outdated.