Lightning protection at the house, but how?

Ah ok. What is the equipotential bonding? I already live in it and my electrical installation has already been approved, my satellite system was also installed by the electrician. Therefore, everything should be grounded anyway. So what were the steel wires at every corner of the house for? What is the point of them sticking out? What is HAR? I don’t have an external lightning protection system. After reading this, it makes absolutely no sense to ground the gutters.

Yes, you understood correctly, without an external system you can leave the gutters as they are.

HAR = house connection room

The flags were at four corners possibly because the executing electrician did not know where the HAR would be located...(pure speculation)

Potential equalization is the technical term for the grounding of the house. However, it is not protection against lightning strikes etc., but necessary according to IEC 60364-4-41:2005 and for Germany DIN VDE 0100-410:2007-06.

Thank you very much for your information.

The following was specified by our electrician:
- continuous foundation earth conductor, as well as one running across the slab (so that semicircles are formed from the mentioned ring wezi)
- a flag in the HAR for the internal house grounding
- a flag at each corner of the house to install a possible external lightning conductor (currently not planned, so currently only in preparation)

From other (older) houses, I know (from seeing) that at least two steel bands from the lightning conductor on the roof are connected to such a flag each

Whether a connection to the gutter is sensible or possible, I cannot judge

If the thread starter now has a lightning conductor on the roof, then I think one connection is not enough; if he doesn’t have one, cutting it off is probably irrelevant

Is one connection sufficient as lightning protection?

Lightning protection is by definition the sum of all measures, divided into external and internal lightning protection. The equating of lightning protection with a lightning protection system has long been outdated.

The internationally harmonized lightning protection standard series IEC 62305, German classification DIN EN 62305 (VDE 0185-305) and in Austria the - except for the national foreword - identical ÖVE-EN 62305, apply only to buildings with lightning protection systems.

Conventional lightning protection systems must have at least two down conductors; only one would be non-compliant with the standard.

The effect of grounded gutters is likely minimal. However, I would say that they definitely belong directly to the foundation earth.

The integration of gutters and the base of downpipes is mandatory in lightning protection systems, but otherwise optional.

If you absolutely want to ground your downpipes now but can no longer reach the lugs, you could instead drive one ground rod each into the ground. Pay attention to material pairing due to contact corrosion.

Separate ground electrodes totally contradict the basic principle of equipotential bonding and are dangerous and non-compliant with standards. Even under very old ABB regulations, they were only permitted under strict restrictions exclusively for lightning protection systems, but have always been prohibited for antennas.

Equipping rainwater downpipes with their own ground electrodes is less dangerous than pointless.

Yes, you understood correctly, without an external system you can leave the gutters as they are.

Agreement, since "external system" means external lightning protection.

Equipotential bonding is the technical term for the grounding of the house.

Objection!

Since I currently have my "house standard" at hand, I copy the official terms according to IEC from it:

3 Terms, symbols and abbreviations

3.1.8 Earthing system The entirety of electrical connections and devices used for earthing a network, an installation or a piece of equipment.

[IEC 60050-195:1998, 195-02-20]

3.1.10 Earth electrode Conductive part embedded in the earth or in another conductive medium, e.g. concrete or coke, which is in electrical contact with the earth.

[IEC 60050-826:2004, 826-13-05]

3.1.13 Equipotential bonding Establishing electrical connections between conductive parts to achieve equal potential.

[IEC 60050-826:2004, 826-12-01]

Separate earth electrodes are completely contrary to the basic principle of equipotential bonding and are dangerous and non-compliant with standards.

Non-compliant with standards, perhaps. I naturally assume that there is no lightning protection system in the proper sense. Rather not dangerous, or what is the physical explanation? A downpipe cannot be compared to two operational equipment that do not have the same potential.