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Using the diagonal main reinforcement in the building column as the lightning deflector (Φ≥12) and using the building foundation as the natural grounding body not only saves steel but also is relatively safe. The downlead main reinforcements shall be long-passed from top to bottom. The upper part (on the roof) shall be welded with a lightning receptor and the lower part shall be welded with the foundation, and shall be respectively connected with the ribs, beam reinforcements and longitudinal reinforcements of the cage, and spiral stirrups. The gluten welding of the ground beam constitutes a complete electrical path. When using the building rebar as the deflector line during construction, all the steel positions should be found in accordance with the design requirements in conjunction with the civil construction. The lightning arrester shall be marked with the paint to ensure that the steel bars on each floor are connected with the top and the bottom, with the reinforcement Layer-by-layer soldering to the top layer. Due to the use of the building steel reinforcement as the down conductor, it is connected from the top to the bottom. Therefore, it is not allowed to set the grounding resistance of the disconnection tester. It must be used as the down conductor on the steel bar, 0.5 to 5 meters away from the outdoor slope protection. Outside the column, another round steel (Φ≥10) is welded to the wall outside the column as a lightning protection test point. The impact grounding resistance at each deflector should not be greater than 5Ω.
The grounding device uses the foundation of the building as a grounding device, which has the advantages of economical, aesthetic, and favorable for the dispersion of the lightning current field, as well as no maintenance and long life. As most of the houses in our city are based on manual digging columns, the conditions are in line with the “Specificationsâ€.
In Section 3?3?5, the concrete inner foundation can also meet the requirements for the use of reinforced concrete as a natural grounding body, and therefore it is recommended to promote it. When the column base is used as a grounding body, the treatment of the ground beam of a building is an important part. The main ribs in the lightning protector ground beam shall be connected with the main ribs of the column foundation, and the steel bars of each segment shall be connected into a loop so that the various foundations can be connected into a joint grounding body and the steel bars of the ground beams form a A good horizontal ring is integrated into a complete grounding system with ground resistance ≤ 4Ω.
The equipotential and lightning protection wave intrusion is clearly stipulated in the new specification, so this part should be given great attention. The role of total equipotential bonding is to reduce the contact voltage between indirect contact shocks in buildings and the potential difference between different metal parts, and to eliminate the danger of dangerous fault voltage introduced outside the building via electrical lines and various metal pipes. It should be The total potential equipotential bonding terminal board near the incoming power distribution box is connected to the PE (PEN) busbar of the incoming power distribution box, and the metal water pipes and gas pipes entering and exiting the building are equipotentially connected. For the lightning wave intrusion, the following measures shall be taken: For the cable entry and exit lines, the outer metal branch of the cable and the arrester steel pipe should be connected to the ground of the electrical equipment at the entry and exit ends. When the cable is converted to an overhead line, a lightning arrester shall be installed at the transition point; the arrester, the metal sheath of the cable, the iron legs of the insulator, and the gold fittings shall be connected together and the impact grounding resistance shall not be greater than 30Ω. For the low-voltage overhead line, the arrester and the insulator's iron feet should be set at the access point, and the gold fixture should be connected to the grounding device of the electrical equipment.
When the multi-circuit overhead line is in and out of the line, a group of surge arresters or other types of overvoltage protectors may be installed only at the busbars or the main distribution box, but the insulator legs and fixtures should still be connected to the grounding device.
Residential building lightning protection design and construction plan
Residential building lightning protection design and construction program, the following Zhengzhou Leidi Electronic Engineering Co., Ltd. technical personnel to briefly explain: