Could you help me take a look at the lightning protection drawings?
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On the left is a circular building, and on the right is a rectangular building; structures over 8.9 meters in height are made of steel. The two down conductors are the main rebar of those two columns that connect to the grounding electrode in the diagram. Is it acceptable to arrange the grounding electrode in that way? The solid dots represent vertically installed structures, made of galvanized angle steel. Connect the vertically installed grounding electrodes using galvanized flat steel. Please help, thank you!
Sure. Before the grounding electrode is connected to the main rebar, it must first undergo a grounding resistance test to ensure it meets the required standards; only after that can it be welded to the main rebar, with appropriate anti-corrosion measures taken.
Thank you! I originally wanted to use the foundation as a grounding electrode, but it was said that the foundation on site had already been completed. Is it necessary for me to make the grounding electrode circular, surrounding the building? Is it necessary to connect the grounding electrodes connected to the two down conductors? It’s a construction site in Xining; there’s not even 3 meters of water there. Should 3-meter-long angle steel be used as a vertical support? The spacing is 6 meters. I had no prior experience with lightning protection, so I had no idea what to do.
If there is 3 meters of no water, some industrial salt can be placed at a height of 600 mm above the ground at the corners where grounding is done, 3-4 kilograms at each location. It is possible to reduce some of the resistance. Measure the grounding resistance value once a year to check whether it is within the acceptable range. Add more salt and pour some water. Whether the points you set are sufficient mainly depends on the measured resistance value.
It is best to make use of the existing foundation grounding system. Since the foundation has already been constructed, consider connecting each column together; this will ensure that the grounding resistance meets the required standards and achieve equipotential bonding, eliminating the need for additional artificial grounding elements.