Flood prevention common sense
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Home appliances should not be placed near the outer wall
Fan Li said that heavy rain weather is usually accompanied by relatively strong lightning. In addition to direct lightning, which may cause significant damage to buildings and people, lightning intrusive waves may also invade indoors along overhead wires and telephone lines, damaging homes. Electrical appliances even hurt people stranded indoors. Fan Li said: "If the interval between lightning and thunder is about 5 seconds, then the thunder cloud is above your head. At this time, the public should turn off the electrical appliances as soon as possible, do not stand under the electric lights, and do not operate using water and electricity at the same time. Household appliances such as washing machines, dishwashers, etc., do not use shower heads to shower when lightning strikes. "According to statistics, household appliances are the most frequently damaged by lightning strikes in our city every year.
Fan Li said that in the eyes of ordinary people, as long as a lightning rod is installed on the roof, everything will be fine at home. In fact, this is a one-sided understanding. Of course, the lightning rod can protect home appliances from direct lightning strikes, but most of the damage to home appliances comes from indirect lightning strikes, which is usually called induction lightning. In thunderstorm weather, household appliances should not be placed near the outer wall. Among them, the power supply, cable TV, telephone, network and other lines enter the room line as far as possible with a metal tube buried, and at the same time, a lightning arrester should be installed on each line end to shunt the voltage limit of the induced voltage invading from the line. For lightning protection at home, it is best to cut off the power supply of household appliances and unplug the power supply; do not make fixed calls.
Keep doors and windows closed against spherical lightning
In addition to direct lightning strikes and lightning intrusion waves, Fan Li also reminded the public to be careful of the possible damage caused by spherical lightning. Spherical lightning is actually a kind of plasma group, which is more likely to appear in the sultry weather with stable airflow. "Spherical lightning usually floats into the room like a fireball. It has a large range and is more difficult to prevent, so it is more harmful to personal safety." Fan Li said that in thunderstorms, citizens should close their doors and windows tightly to prevent spherical lightning Invasion.
Indoors, it is best for the human body to be more than 1.5 meters away from the lines and equipment that may introduce lightning waves. Do not wear wet clothes or near wet walls. Do not touch antennas, water pipes, barbed wire, metal doors and windows, external walls of buildings, and keep away from live equipment such as wires or other similar metal devices when lightning strikes.
In addition, Fan Li also reminded that if the citizens are inevitably exposed to the outdoors during thunderstorms, they should squat down immediately when they feel that their hair is standing up or the skin is shaking significantly, and try to reduce their height as much as possible; at the same time, put their feet together and bend forward , Sit down with your hands on your knees, let your feet and hips contact the ground, and the hands or arms are not grounded, which can reduce the degree of lightning damage to the human body. In addition, do not stop on the top of a mountain, ridge, or building; do not stop near iron fences, metal clotheslines, overhead metal bodies, and railroad tracks; do not swim in outdoor swimming pools, lakeshores; do not sit under isolated trees or chimneys Stay; do not hold umbrellas in open areas, do not carry metal tools, badminton rackets, golf clubs, etc. on your shoulders; do not drive motorcycles, bicycles, and run fast; you should quickly hide into buildings protected by lightning protection facilities , Or all kinds of vehicles with metal roofs and cabins with metal shells.
1. Refuges should generally be located closest to home, with high terrain and convenient transportation, with water supply and drainage facilities, and good sanitary conditions. In cities, most of them are flat roofs of high-rise buildings, schools or hospitals with high terrain or solid buildings. Don't take refuge in underground public places.
2. Keep warm items such as clothing and quilts, food, drinking water and medicines in a high place. Tickets, jewelry and other items can be sewn into the clothing. Valuables should be transferred as much as possible, and they cannot be transferred.
3. Collect wooden basins, wooden blocks and other floating materials into lifesaving equipment for urgent needs; before the flood comes, you can use wooden basins, buckets and other water holding tools to store clean drinking water.
4. Prepare medicines, fire, etc .; save all kinds of communication facilities that can still be used, and maintain good communication and transportation links with the outside world.
Since the evening before yesterday, heavy rain weather has hit our city. In order to prevent floods, landslides and other disasters that may follow, the relevant departments of our city have actively taken action. Relevant departments particularly pointed out that in heavy rain weather, citizens should pay attention to lightning protection to avoid losses due to lightning strikes. The reporter interviewed Mr. Fan Li, a senior engineer of the Chinese Academy of Electric Power Sciences and an authoritative expert in the field of lightning protection in China.