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Lightning tower and grounding requirements
- 2019-08-08-
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(1)The lightning protection tower should have perfect lightning protection and secondary induction lightning installation, and the connection of the wall lightning belt Must conform to the design and related specifications, the lightning rod and feeder frame should be set to the special lightning current down conductor, the material is 40mm × 4mm of the whole galvanized flat steel, do not leave the grid to the lightning protection tower, and firmly fixed with the tower body , welding with each other qualified, the site welding site should have a firm anti-rust and anti-corrosion measures. (2) Solar tower lights should be used for lightning protection towers. For aviation sign lights using AC power feeding, the power line shall be a cable with a metal outer sheath. The metal outer sheath of the cable shall be grounded near the outside of the entrance of the tower and the entrance to the machine room. Each phase line of the tower light control line and the power line should be installed with a lightning arrester at the entrance of the equipment room. The neutral line should be directly grounded. (3) The communication antenna should be within the maintenance range of the lightning receptor. The lightning receptor should be set to the special lightning current down conductor. The data should be 40mmX4mm galvanized flat steel. (4) Requirements for hot-dip galvanized flat steel:
A. Flat steel routing: from the channel where the antenna is required to be placed (general GSM antenna) at the beginning of the channel, flat iron Vertically on the channel surface, the surrounding channel guardrail is wound around a circle and fixed in the place where the guardrail and the channel are replaced, that is, the bottom of the guardrail. Pass through the feeder hole (the feeder hole should be facing the horizontal cable rack), along the ladder The side is stepped down and connected to the ground network. The entire route must not be upturned or returned. If it is an omnidirectional station, the second layer of the channel should also be placed around a guardrail with a 40*4 hot-dip galvanized flat steel. One end is welded to the vertical flat iron down the channel;
B. Flat steel punching position: flat iron placed on the channel, two holes per 50cm, two holes The distance between each other is 5cm and the aperture is 10mm. 8 holes are made upwards at 20cm above the horizontal cable rack in front of the feeder window of the machine room. The hole size is 10mm, and the center distance between the two holes is 25mm. When the feeder window of the equipment room is far from the lightning tower ladder At 70cm, 8 holes are made upwards 15m above the wire rack, the hole size is 10mm, and the center distance of the two holes is 25mm.
C. Hole and insulation requirements: All electric rotation holes are selected to avoid electric welding holes, the hole diameter is 10mm, and the anti-corrosion treatment is carried out after drilling. If the conditions are promised, the flat iron and the lightning protection tower should be insulated as much as possible (claim). D. Consider 3G reservation: on the other side of the ladder, the same flat steel is used to release the same flat steel, starting from the channel of the 3G antenna (generally 3G and GSM antennas are not in the same channel) Laying down, into the ground net, punching. The specific requirements are exactly the same as above. The flat steel for 3G and the flat steel for GSM are not directly connected before entering the ground network.

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