Many people spent hundreds of pieces of anti-mine needles, resulting in unsettled land, and thunderstorms were used to jump and burn equipment。Self-buildingThe principle of mine-shielding and lightning-shielding seems to have been used differently in practice, and the wrong choice is nothing。
It's the true principle of lightning
According to the 2023 white paper on mine prevention of the china meteorological administration, every year more than 1,200 homes are damaged and destroyed, with almost 40 per cent of the homes built in rural areas. The core logic of a lightning rod is not to block a mine, but to grab it. The tip of the needle gathers high-density positive charge under the thunder cloud-powered electric field, and the cloud with the negative charge forms a very small amount of electricity, which is so high that it penetrates the middle air that the lightning is drawn to the needle that it leaks into the ground along the line。
The entire discharge route is as follows: the needle is filled with 16 mm zinc round steel, followed by a thick copper cable or steel winch, to the ground where the ground is buried above a metre. The thunder current can peak at 200 km and must be dispersed in 10 microseconds. If ground resistance is measured to be more than 10 om, the currents will refill the house with needles, piercing electrical appliances with humans, with far more serious consequences than failure。
What's the difference between a wire and a pin
Many owners mix these two things. The difference is in the shape of protection: the lightning rod is a single-point flash, the range of protection is a spherical surface, with a radius of approximately 1. 5 to 2 times the height of the needle; the mine escape line is a guide between the two poles, with a cylindrical scope of protection suitable for covering a long roof or yard wall. Like the flash principle, it is cutting-edge discharge and discharge, but the actual area covered is very different。
A two-storey self-built house with a two-metre-high needle on the roof is almost enough. But if your house is three rows of contour and you have a shed behind you, and you can't cover the end of your head with a single needle, you'll have to pull it in the middle of a pole at both ends and turn it into a needle-and-line combination. In 2024, the largest amount of such a programme was used in the rehabilitation of self-built houses in the south-south yang countryside, where the total cost of a needle plus a line could be contained within $500。
Shouldn't we have three conditions on our own
The criteria are straightforward. First average number of thunderstorm days per year: sichuan, hunan, jiangxi, guangdong, etc., have an average of over 70 days per year, which is basically mandatory; beijing, inner mongolia, has only 20 days per year, with a low risk level. Second, look at the surrounding environment: if you have a wood or a high-rise house more than 30 metres next to it, your house is in a shielded area, with little chance of being hit directly by the main mine。
Third, look at its height. Two floors of self-building, seven to eight metres, and standing in open fields are the most prominent metal targets. Even if there's a tree next to it, as long as the roof is more than two meters above the canopy, you can be hit on the side. Taken together, unless you live under the shadow of the top of the 30 floors, it's recommended that two or more floors of self-building be installed and that the cost of processing the materials be $20000, which would be a good thing for decades。
Don't make mistakes with a lightning rod
In 2025, an owner of the emerald fatty paid $800 for needles and welded them directly on the heating pipe, and the house jumped three times in the rain and everything in the fridge stinked. The correct approach: flash rods must be at least zero and five metres above the floor, rods must not be less than 16 mm in diameter, grounders must be buried at 40 times 40 times four mm of zinc plating steel, not less than zero six metres deep, and rock-to-earth measurements of electrical resistance must be less than 10 om, preferably under 4 om。
Another high-frequency error was the placement of needles next to television antennas or solar panels. In 2024, a family in changjiang, guangdong, the electric magnetic sensor burned the antenna red during the thunderstorm, and the current followed the same axis into the living room, where the power plant collapsed. It's more than three metres away from metal pipes, antennas and solar panels, and it's in a general switch box and a wave protection。
Don't be lazy about these things in the rain
Every may to august is a high-impact window. The self-builder's thunderstorms are very specific: television, computers, washing machines are all plugged, not buttons, but pull down; all doors and windows are closed and not sewn; people are at least 1 5 metres away from water pipes, heating pipes, outer walls, which are natural detonators, which are so close that they add a flash line to themselves。
In particular, it reminds elderly people who use the aircraft. In 2023, the case was reported by hunan yeung: a 68-year-old person made a telephone call on the day of the thunderstorm, the machine was not equipped with a mine-proof module, the lightning entered the house along a telephone line and the old man was knocked down by electricity, fortunately without causing a life risk. If the self-constructed house is also connected to a telephone line or a network line, the entry line must be removed by thunderstorms or a mine-proof module must be added to the entry box in advance。
It's like a thunderstorm
In thunderstorms, you're on fields and slopes, and the core principle is five words: find the lowest place. In july 2024, a villager, who was sheltering in a cornfield on pictionary day in guizhou, with only one single tree next to him, climbed up to avoid the rain, and was later struck by a side grenade and taken to a district hospital. The right approach is to stay away from the trees, billboards, utility poles, crouching into low-lying ditches, with both feet on the ground and minimizing the cross-step voltage, with all metal umbrella bars。
If there is nothing around it, the ball is folded: hands on the knee, heads down, feet together, reducing the power gap between the body and the ground. Don't lie flat, it's like a conductor. Thirty seconds after the sound has disappeared, and if the thunder can still be heard, it means that the cloud remains within a kilometre and remains on its knees until it is completely quiet。
Did you build your own house with a lightning rod? Is it a needle or a wire? Did you find an electrician with a rocker? The comment area would be welcome to talk, and it would be useful to order a compliment to a friend of the family who had not been installed, reduce the risk of thunder strikes and reassure the family。
