*Dipol*
2022-06-21 23:10:04
- #1
For grounding, I plan a 16mm² grounding cable between mast and house equipotential bonding rail, and for the equipotential bonding between mast, grounding block with surge protection, multiswitch, and house equipotential bonding rail a 4mm² grounding cable.
16 mm² Cu in solid and multi-strand form is standard-compliant, but the antenna grounding is only functional with connectors certified at Class H = 100 kA including the HES.
Now I have two empty conduits running from the attic to the utility room. Can I put all cables (grounding + 4x coaxial) into one conduit? A photovoltaic system is planned for the future. Surely that will require grounding as well. How should I separate the individual cables there? Grounding cables all in one conduit and the rest in the other?
Grounding conductors from roof antennas as well as photovoltaic cables or functional grounding conductors for the photovoltaic module carriers according to recommendation of Annex 5 of DIN EN 62305-3 are lightning highways in rare direct strikes. If they pass through the building interior, dangerous proximities are inevitable regardless of how the cables and conductors are divided into two adjacent empty conduits.
For my safety, I want to have the lightning protection inspected and accepted.
The only one who "accepts" anything is the client; contractors have a right to have a defect-free work accepted. Since no lightning protection system but only a conventional grounding is being installed, only the grounding system must be measured for continuity resistance between the connection lugs before concreting according to DIN 18014:2014-03 by a licensed electrician and documented with plans and detailed photos. If this has been properly performed, YOU have to accept the grounding system; it is rarely norm-compliant.
Without a lightning protection system, no measurement of earth resistivity is currently required.
We have laid a ring earth electrode in the ground and connected it with the reinforced concrete slab (steel). The tag rises in the utility room, where the house equipotential bonding rail was installed.
Additionally, I have a tag standing up on a corner of the house. This should also be connected to the ring earth electrode. I think the builder placed this there because it was specified in our construction service description. Would this be suitable as a grounding for a lightning rod or rather not?
According to DIN 18014: 2014-03, ring earth electrodes are only required in cases of elevated earth resistivity such as waterproof concrete (WU concrete). From a standard-compliant documentation of an electrician, it must be evident whether all connection lugs are connected with the ring earth electrode AND with the functional equipotential bonding conductor laid in reinforced concrete slabs similar to a foundation earth electrode. The lightning current carrying capacity of the connectors must also be documented.
If a standard-compliant measurement documentation from a licensed electrician exists: please upload it, then I will review it and provide an assessment.