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Hazards are related to the source of the occurrence.
Different sources of radiation have different hazards.
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The state does not have a national standard for electromagnetic radiation, but the environmental department has a recommended standard, 4kv m
I think the power distribution room in the community is mostly 10kv. As long as there is enough.
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Rest assured. There are a lot of cabinets in the power distribution room, next to your house, the door says power distribution room, in fact, it is just a transit war, just a small amount of low-voltage equipment, such a room, the isolation is relatively in place. In fact, the walls of today's houses are slightly anti-radiation, which will not affect personal health.
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You're asking a question about electromagnetic radiation, but I'm an expert.
First of all, electrical radiation and magnetic radiation are two concepts, although they both come from the power grid, but they should be treated differently.
Secondly, 20 meters is indeed too close for electrical radiation. Relevant data show that the 500kV substation, which is what we call 500,000 stations, has an electric field strength of 10m outside the wall. You're 220,000 stations over there, and you can calculate it proportionally.
Thirdly, no one can say whether there is harm or not, and how much harm there is, and the state does not have corresponding standards to define it. One thing that can be confirmed is that there is indeed electric field radiation.
Thirdly, the strength of the magnetic field does not change with distance, and the result of its interaction with the geomagnetic field cannot be defined.
Hope it helps.
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Effect of power frequency electromagnetic field on the central nervous system.
For a long time, scholars from various countries have different views on the question of whether the power frequency electromagnetic field has an impact on the central nervous system. Many labor hygiene investigation reports on high-voltage and ultra-high-voltage transmission lines and substations at home and abroad have pointed out that neurasthenia and memory loss are the most common symptoms of power-frequency electromagnetic field workers, but there is a lack of objective examination results. At present, it is believed that the effect of power frequency electromagnetic field on the central nervous system is mainly caused by electric field, which can be supported by animal experiments.
The relationship between power frequency electromagnetic field and tumorigenesis.
Many investigations have found that occupational exposure to electromagnetic fields, although it may increase the risk of developing tumors, especially leukemia, lymphatic system tumors, and neurological tumors, is not high and not statistically significant. However, it should be pointed out that if there are other strong carcinogenic factors in the production environment at the same time, the role of the power frequency electromagnetic field cannot be ignored.
Effect of power frequency electromagnetic field on reproduction.
Statistics show that the use of electric blankets in the first trimester alone is associated with an increased incidence of miscarriage. However, the incidence of miscarriage is reduced with the use of electric blankets in the second trimester. Abroad, Nordstrom et al. reported for the first time that a retrospective survey of 542 power plant workers found that the proportion of children suffering from congenital malformations increased when the father worked in the high-voltage dispatch room.
Due to the small number of cases, the conclusions are uncertain.
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