According to industry 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.
"There are common problems in China's households with poor electricity consumption environment, such as poor grounding, reverse connection between live wire and ground wire, inferior switch socket, aging and short circuit of lines, etc." Liu Yubo, Marketing Manager of Mibo Wuhan Company, told reporters that in many developed countries, water heaters have been equipped as supporting facilities integrated with buildings as early as the building installation stage, while real estate developers in China have not provided standardized grounding systems for water heaters. "This requires that water heater products 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 "anti-electricity wall" has been voted by experts 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 the water heater with qualified quality is used in bad electricity consumption environment, safety accidents 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, reverse connection between live wire and ground wire, inferior switch socket, aging and short circuit of lines, etc. If there are no preventive measures, even qualified electric water heater products may cause electric shock. "
It is reported that in order to prevent the risk of electric shock, well-known domestic water heater brands have developed "anti-electricity wall" technology, hoping to bring consumers a safe bathing environment. In the new international standard (IEC standard), the technology of "anti-electricity wall" of water heater is also included.
However, in practice, it is found that the traditional "two-way anti-electricity wall" technology can solve the problem of water heater effluent electrification, but it is helpless for other household appliances electrification caused by water heater leakage. This is the terrible situation that Mr. Li's friend encountered, "Husband takes a bath and wife gets an electric shock".
Leakage safety hidden trouble that can't be ignored
Why is bath safety promoted to such an important position by most domestic consumers? This is because there are some terrible leakage safety hazards in some harsh electricity consumption environments in China.
Insiders told reporters that this hidden danger is mainly divided into two situations: First, the ground wire is invalid in the case of * * * ground wire. At present, every residential building in every community in China uses a ground wire to connect different users and different household appliances.
Theoretically, it is safe to use an electric water heater if the grounding wire is well connected. But the reality is that this ground wire is a * * * ground wire, and the relevant management is not perfect at present, and the ground wire lacks maintenance, and it often fails after being soaked in rain. In addition, at present, after the delivery of residential buildings in China, some non-professionals will damage the ground wire during the secondary decoration, which will lead to the failure of the ground wire.
Second, there is a risk of electric leakage in electric water heaters. At present, the heaters of electric water heaters on the market in China are basically armored heaters, and their metal shell materials are all welded by rolling metal plates. There are three factors that cause the heater to crack and leak during use. The first type is welding defect, which leads to metal pipe leakage due to poor local welding; Second, the defects of the metal material itself, long-term immersion in water, metal pipe rupture led to leakage; The third is the water quality of users' homes. Strong acidic water corrodes the surface of metal pipeline, which leads to the leakage of heater.
Water heaters put an end to potential safety hazards
The reporter learned that in order to completely solve this problem, some water heater manufacturers have specially strengthened the patented technology of "anti-electricity wall". Before R&D, engineers selected 350 families in 8 core cities as samples, and made a detailed study on their housing structure, wall design, household appliances, district 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-way anti-electricity wall.
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 caused by poor grounding of other household appliances, avoids the accident of "husband taking a bath and wife being electrified" and comprehensively solves the three major safety problems.