Why should the water heater be equipped with two anti-electricity walls?

What is the function of the electric wall? According to insiders, the principle of "anti-electricity wall" of water heater is equivalent to installing a large resistor between human body and water. Once leakage occurs, this "resistor" can share most of the voltage, so that the voltage borne by human body is below 12V, which is far lower than the safe voltage of 36V human body. "Poor grounding, reverse connection between live wire and ground wire, inferior switch socket, aging and short circuit of lines are common problems in households with poor electricity consumption environment in China." Liu Yubo, Marketing Manager of Mibo Wuhan Company, told reporters that in many developed countries, water heaters have been equipped as supporting facilities of the same building as early as the construction and installation stage, while real estate developers in China have not provided standardized grounding systems for water heaters. "This requires that water heaters sold in the China market must have higher safety standards to protect the interests of consumers." It is reported that as early as June 5438+February 2007, the technical scheme of water heater "electric wall" has been voted by experts from all over the world and officially written into the new international standard (IEC standard). A related person from China Household Appliance Standardization Committee said that the electricity consumption environment in different countries is very different from that in China, so it is imperative to improve the safety standard of electric water heaters. A qualified water heater is not necessarily safe. Can't a qualified water heater guarantee the safety of bathing? With Mr. Li's questions, the reporter consulted industry experts. The answer is chilling: even if a qualified water heater is used in a bad electricity consumption environment, a safety accident may still occur. "This is mainly caused by the poor power environment." A salesperson of Mibo water heater explained, "The investigation by authoritative organizations shows that there are many problems in China, such as poor grounding, connection between live wire and ground wire, inferior switch socket, aging and short circuit of lines, etc. If there are no preventive measures, even using qualified electric water heater products may lead to electric shock. " It is reported that in order to prevent the risk of electric shock, well-known domestic water heater brands have developed "electric wall" technology, hoping to bring consumers a safe bathing environment. In the new international standard (IEC standard), the "electric wall" technology of water heater is also included. However, in practice, it is found that the traditional "two-way anti-electricity wall" technology can solve the electrification problem of water heater sockets, but it is helpless for the electrification problem of other household appliances caused by water heater leakage. This is the terrible situation encountered by Mr. Li's friend: "The husband takes a bath and the wife gets an electric shock." Why is bath safety promoted to such an important position by most consumers in China? This is because there are terrible hidden dangers of electricity leakage in some places with bad electricity consumption environment in China. Insiders told reporters that this hidden danger is mainly divided into two situations: First, the ground wire is faulty when it is used. At present, every residential building in every community in China is connected with a ground wire to different users and different household appliances. Theoretically, if the grounding is good, the electric water heater can be used safely. However, the reality is that this ground wire is an ordinary ground wire. In addition, at present, the relevant management is not perfect, the ground wire lacks maintenance, and it often fails after being soaked in rain. In addition, at present, after the domestic houses are delivered for use, some non-professionals will damage the ground wire during the secondary decoration process, resulting in the failure of the ground wire. Second, electric water heaters are in danger of electric leakage. At present, the heaters of electric water heaters in the domestic market are basically armored heaters, and their metal shell materials are welded by rolling metal plates. In the process of use, there are three factors that will lead to the damage and leakage of the heater. First, welding defects, which lead to metal pipe breakage and leakage due to poor local welding; Second, the defects of the metal material itself, the metal tube will break when immersed in water for a long time, leading to leakage; The third is the water quality of users' homes. Acidic water corrodes the surface of metal pipeline, causing the heater to leak. The reporter learned that in order to completely solve this problem, some water heater manufacturers have specially strengthened the patented technology of "electric wall". Before At R & ampD, engineers selected 350 families in 8 core cities as samples, and made a detailed study on building structure, wall design, household appliances, regional power supply, and water heater usage habits. After 12 months of painstaking research and development, we finally developed an epoch-making new generation of water heater safety technology patent-three electric walls. According to the engineer, the biggest difference between the "three-way electricity-proof wall" technology and the traditional electricity-proof wall technology is that it not only solves the forward leakage problem of the internal components of the water heater and the reverse leakage problem caused by environmental problems, but also solves the electrification problem of other household appliances caused by poor grounding of the ground wire, avoiding the accident of "husband taking a bath and wife being electrified" and comprehensively solving the three major safety problems.