Hello,
Over the next two days, our strip foundation including the foundation grounding will be installed. However, I am not entirely sure if everything is being done correctly, and I would like to hear your opinions.
The trenches have been dug. Today, the concrete workers placed a dimpled membrane on the bottom of the trench. I assume this is to act as a blinding layer? Then the reinforcement cages were placed inside. The foundation grounding conductor, made of flat steel, was placed into the reinforcement cages but was not connected to the individual cages. Is the lateral connection—considering there is a dimpled membrane underneath—of the strip foundation, where the grounding conductor is embedded, sufficient to ensure adequate conductive connection to the soil?
Is there any reason to avoid embedding empty conduits for cables within the reinforcement cages in the strip foundations?
Thank you very much for your answers.
Regards
Over the next two days, our strip foundation including the foundation grounding will be installed. However, I am not entirely sure if everything is being done correctly, and I would like to hear your opinions.
The trenches have been dug. Today, the concrete workers placed a dimpled membrane on the bottom of the trench. I assume this is to act as a blinding layer? Then the reinforcement cages were placed inside. The foundation grounding conductor, made of flat steel, was placed into the reinforcement cages but was not connected to the individual cages. Is the lateral connection—considering there is a dimpled membrane underneath—of the strip foundation, where the grounding conductor is embedded, sufficient to ensure adequate conductive connection to the soil?
Is there any reason to avoid embedding empty conduits for cables within the reinforcement cages in the strip foundations?
Thank you very much for your answers.
Regards
M
Mephisto2320 Apr 2020 21:47What exactly do you mean?
W
Wurstsalat21 Apr 2020 13:46Mephisto23 schrieb:
Ah, so it’s probably a ring earth electrode. It’s installed as a ring within the strip foundation, and connected to it is a 10mm V4A round steel rod running to the potential equalization busbar. I don’t have a full tanking system. I have a dimple membrane under the strip foundation and receive perimeter insulation below the slab. I believe the only part in contact with the ground is the sides of the strip foundation. The ring earth electrode is located outside the foundation and, to my knowledge, is only permitted if a black or white tanking system is installed… otherwise, a connection must be made every 20cm (8 inches).
I don’t quite understand why you have a dimple membrane underneath, but well, it doesn’t cause any harm.
Usually, the registration with the energy supplier cannot or should not be done by just anyone; it must be carried out by a registered electrical contractor. Sure, the supplier will lay the utility line for you, but you are not allowed to make any connections without proper registration (which can also become costly if not followed).
So, we (the construction company) usually place the grounding conductor once around the foundation ring at the bottom on the soil without a membrane. If a membrane is used, I would additionally connect the grounding conductor with a 1 meter (3.3 feet) stainless steel earth rod driven into the ground. This was the electrician’s requirement for a multi-family house. The conductor had to be fastened to the cage with a clamp every meter (3.3 feet). However, to be sure, I would recommend consulting an electrician you trust to get the exact details. Unfortunately, I cannot tell you precisely what is required by DIN standards or regulations.
M
Mephisto2322 Apr 2020 22:19I spoke with a master electrician. He said that the grounding conductor should be connected to the reinforcement cages every two meters (6.5 feet). However, if the measurement shows a proper resistance of the grounding conductor to earth, this would be acceptable.
The permanently embedded foundation grounding electrode cannot corrode, and the connection of the grounding conductor to the V4A (stainless steel) terminal lug—which is connected to the potential equalization busbar—cannot come loose, as it is firmly cast into the concrete.
I will first arrange for the measurement to be carried out, and then we will proceed from there.
Thank you very much for your responses.
The permanently embedded foundation grounding electrode cannot corrode, and the connection of the grounding conductor to the V4A (stainless steel) terminal lug—which is connected to the potential equalization busbar—cannot come loose, as it is firmly cast into the concrete.
I will first arrange for the measurement to be carried out, and then we will proceed from there.
Thank you very much for your responses.
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