Xuchang lightning protection company grounding construction technical requirements
2023-10-13 07:08:32
The technical requirements for grounding construction of Xuchang lightning protection company require lightning protection and grounding construction: The lightning protection grounding construction method must meet the design requirements, and the grounding resistance of the test grounding device must meet the design requirements; at present, the residential building adopts protective grounding, lightning protection grounding, and working ground connection. Grounding, grounding resistance is not greater than 1 euro mother. Technical requirements for grounding construction of Xuchang lightning protection company When the design is not required, the depth of the top surface of the grounding device should not be less than 0.6m. Round steel, angle steel and steel pipe grounding poles shall be buried vertically in the ground. The spacing shall not be less than 5m. The grounding device shall be made of steel and hot-dip galvanized.
Lightning ground deflector: construction equipotential bonding steel bar is strictly prohibited with the lightning protection ground lead down the public to connect the metal conductor, should be unified in the grounding body to do the combined grounding. Xuchang lightning protection company grounding construction technical requirements soil resistivity measurement 1, soil resistivity measurement methods: soil sample method, three-point method (depth change method), two-point method (Western slope Shepard soil resistivity method) Four-point method, etc. This standard mainly introduces the four-point method.
2. When using the four-point method to measure the soil resistivity, note the following:
(1) Steel ground rods should be used for the test level and threaded rods should not be used. In the rocky soil zone, the ground rods should be driven obliquely at an angle to the vertical direction. The inclined ground rods should avoid the top of the stone.
(2) Test leads should use flexible leads for multiple winding applications. When confirming the length of the lead, the temperature of the site must be taken into account. The insulation of the leads should not be frozen or cracked due to low temperatures. The impedance of the leads should be low.
(3) For the general soil, because the steel ground rods need to be driven into deeper soil, a hammer with a weight of 2 to 4 kg should be used.
(4) In order to avoid interference caused by buried metal objects in the measurement, in the understanding of the position of underground metal objects, the direction of the arrangement of grounding bars can be perpendicular to the direction of underground metal objects (pipes).
(5) When measuring substations and lightning arrester grounding poles, insulation shoes, insulating gloves, insulation mats and other protective measures shall be used, and grounding poles may be tested only when measures are taken to minimize the arrester discharge current.
(6) Do not measure when the soil is wet after rain.
Lightning ground deflector: construction equipotential bonding steel bar is strictly prohibited with the lightning protection ground lead down the public to connect the metal conductor, should be unified in the grounding body to do the combined grounding. Xuchang lightning protection company grounding construction technical requirements soil resistivity measurement 1, soil resistivity measurement methods: soil sample method, three-point method (depth change method), two-point method (Western slope Shepard soil resistivity method) Four-point method, etc. This standard mainly introduces the four-point method.
2. When using the four-point method to measure the soil resistivity, note the following:
(1) Steel ground rods should be used for the test level and threaded rods should not be used. In the rocky soil zone, the ground rods should be driven obliquely at an angle to the vertical direction. The inclined ground rods should avoid the top of the stone.
(2) Test leads should use flexible leads for multiple winding applications. When confirming the length of the lead, the temperature of the site must be taken into account. The insulation of the leads should not be frozen or cracked due to low temperatures. The impedance of the leads should be low.
(3) For the general soil, because the steel ground rods need to be driven into deeper soil, a hammer with a weight of 2 to 4 kg should be used.
(4) In order to avoid interference caused by buried metal objects in the measurement, in the understanding of the position of underground metal objects, the direction of the arrangement of grounding bars can be perpendicular to the direction of underground metal objects (pipes).
(5) When measuring substations and lightning arrester grounding poles, insulation shoes, insulating gloves, insulation mats and other protective measures shall be used, and grounding poles may be tested only when measures are taken to minimize the arrester discharge current.
(6) Do not measure when the soil is wet after rain.
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