Lightning protection and grounding device calculation rules - Database & Sql Blog Articles

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1. The grounding pole is installed and installed with "root" as the unit of measurement. The length is calculated according to the design length. When the design is not specified, each length is calculated according to 2.5m. If the cap is designed, the cap amount is calculated according to the workpiece.
2. The grounding busbar is laid, and the project is calculated according to the design length with “m” as the unit of measurement. The grounding busbar and lightning protection line are all calculated according to the extension meter. The length is calculated according to the horizontal and vertical specified length of the construction drawing design plus an additional length of 3.9% (including turning, up and down fluctuation, avoiding obstacles, and the length of the joint). When calculating the main material fee, the specified loss rate should be added.
3. The grounding jumper is measured by “station”. According to the regulations, the engineering content of the grounding jumper should be used. The calculation of the outdoor power distribution device frame should be grounded every time, and each sub-frame should be grounded. "calculation."
4. Processing and installation of lightning rods, with “root” as the unit of measurement, and independent lightning rods installed with “base” as the unit of measurement. The length, height and quantity are as specified in the design. The processing of independent lightning rods shall be carried out in the production of “general iron parts” or by finished product.
5. The installation of the semiconductor less-long-needle lightning-reduction device is based on the “set” as the unit of measurement, and the corresponding sub-heads are respectively executed according to the design and installation height. The device itself is supplied in sets by the equipment manufacturer.
6. Use the main ribs in the building as the grounding down conductor to install “10m” as the unit of measurement. Consider the two main ribs in each column. If the number of main ribs is more than two, it can be adjusted proportionally.
7. The production and installation of the disconnected clamps is based on the “set” as the unit of measurement. The number of disconnected clamps installed according to the design regulations is calculated. The installation of the disconnected clamps in the grounding inspection well is calculated according to one set per well.
8. The lightning protection grounding device of the roof of the high-rise building shall be equipped with the “Lightning Protection Network Installation” quota. The installation of the grounding cable of the cable bracket shall be carried out with the sub-item “Equipment of the indoor grounding busbar”.
9. The pressure equalizing ring is laid with “m” as the unit of measurement. The main reason is to use the main ribs in the ring beam as the grounding connection of the equalizing ring. The welding is considered according to the two main ribs. When there are more than two, it can be adjusted according to the ratio. The length of the center line of the ring beam that is equalized and grounded according to the design needs to be calculated in length.
10, steel, aluminum window grounding with "where" as the unit of measurement (high-rise building six or more metal windows, the design generally requires grounding), according to the design of the number of metal windows grounded for calculation.
11. The main ribs of the column are connected with the ring beam with the “place” as the unit of measurement. Each place is welded and connected according to the two main ribs and the two ring beams. If there are more than two steel bars for the main ribs and ring beams, they can be adjusted according to the proportion. The number of “main” bars of the main ribs and ring beams that need to be connected is calculated according to the specified design.
12. The embedding of the resistance reducing agent is measured by “kg”.
13. The commissioning rules for the grounding grid are as follows:
(1) Determination of grounding grid grounding resistance. A general power plant or substation is connected to a parent network, which is calculated according to one system; an independent grounding network that is not connected to the parent network of the factory network is calculated according to one system, although the grounding networks are finally connected together. However, it should be calculated according to the respective grounding grid, and should not be used as a net. The specific conditions should be determined according to the test conditions of the grounding grid.
(2) Determination of lightning rod grounding resistance. When each lightning rod has a separate grounding net (including independent lightning rods, chimney lightning rods, etc.), it is calculated in one set.
(3) Independent grounding devices are calculated in groups. For example, an on-column transformer has a separate grounding device, which is calculated in a group.