An anti-electricity wall can never prevent the water pipe from being electrified. If the water pipe is already charged, we install an anti-electricity wall. Even if the anti-electricity wall is effective and can isolate electricity, it can only waterproof the electricity on the pipe. It flows to the water heater. If there is no problem with the water heater, can you take a shower? At least don't open the water valve, otherwise you will get electric shock. This itself is a problem of the electricity environment and should be eliminated by the relevant departments. If we mistakenly believe that the anti-electricity wall is useful, we will neglect its use due to misunderstanding and cause harm.
So is a water heater with an anti-electricity wall really safe?
In the electric water heater industry, anti-electricity walls have become synonymous with the safety of electric water heaters. Some manufacturers even want to incorporate anti-electricity walls into national standards. So anti-electricity walls can really be used in electric water heater products. Is it as safe as everyone claims? Why did European and American countries say around 2003 that the launch of anti-electricity walls by a Chinese brand was pure terror sales? Let’s analyze the instructions for using the anti-electricity wall:
1. Purpose
Safety protection products suitable for any electric water heater. After the water heater is equipped with an anti-electricity wall, no matter what kind of leakage accident occurs in the water heater, no matter whether the water heater has a ground wire or not, there is no risk of electric shock in the part below the anti-electricity wall, thereby ensuring personal safety during the bathing process.
Analysis:
1. "No matter what kind of leakage accident occurs in the water heater"
What about the leakage of water heaters with metal shells on the shell? Are the buttons charged? Can anti-electricity walls protect against electricity? If our users still think it is safe to operate the water heater in this situation, their negligence will cause serious consequences due to the presence of anti-electricity walls.
2. "Regardless of whether the water heater has a ground wire or not"
Is the good grounding mandated by the state child's play? So are the products we leave the factory connected to a ground wire just to look good? If there is no ground wire, the result will be the same as the first one. Grounding is to take away the current when the chassis is charged, the buttons are charged, and any part of the product that can be charged is charged. If we just isolate it and only make the water outlet uncharged, will the leakage place be safe? Who can guarantee that users will not contact it? Just like when a flood rises, we only think about blocking the flood, without thinking about how to reduce the flood. The consequences can be imagined.
3. "There is no risk of electric shock below the anti-electricity wall"
Same as the two above, what about the part above the anti-electricity wall? Who can guarantee that users will not contact it? Just like our cars, if we add vibration damping, we don't need to build roads, and the car won't be bumpy? Maybe adding too much vibration damping will make the car shake more. If the road is not repaired, it will be easier to blow out the tires. Can our safety be guaranteed?
4. "Thereby ensuring personal safety during the bathing process"
In the above situations, the water heater can also ensure personal safety during the bathing process, indicating that the water heater itself does not have a leakage protection device. Can I still bathe normally? Of course, it is impossible for our users to know that there is a leakage in the water heater. They will feel confident operating the buttons, turning on the water valve, and touching any part of the water heater. Even if the water is no longer charged, are our users safe at this time? This is the "personal safety during bathing" that is feared, and everything else is unsafe.
Therefore, for true electricity safety, we cannot rely on anti-electricity walls. However, for the safety of the water heater itself, its own protection function is very important. In case of possible leakage, automatic protection, automatic cutting off of all power supplies in the machine, and alarm reminder are provided to ensure safety. If the protection fails, you cannot rely solely on anti-electricity walls. Relying on anti-electricity walls will cause the above-mentioned dangers. It depends on the structural safety of our product itself. When the protection fails, the shell cannot be charged, the buttons cannot be charged, and the water inlet and outlet must be made of non-metallic materials. As long as the air gap and creepage distance standards between each charged body and the chargeable housing, buttons and other parts that may come into contact with the human body are ensured, the safety of electricity can be ensured and foolproof.
2. Principle
"Isolation wall" is an abbreviation, and its exact expression should be "water resistance attenuation isolation method".
In the general impression, water is a conductor, and contact with electricity is very dangerous.
In fact, any object has resistance, so if it is economical, it can be transformed into an appliance that meets people's needs and benefits mankind. That's what "electrical walls" are.
The "insulation wall" (i.e. water resistance attenuation isolation method) makes use of the resistance of the water itself (for example, the national standard stipulates that the resistivity of tap water at 15°C should be greater than 1300Ω.cm). The selection of the material (insulation material) of the water pipe in the water heater, and the determination of the pipe diameter and distance form an "insulation wall". When the electric water heater is powered on, even if the water in the heating tank has electricity, it will be attenuated by the resistance of the water itself when passing through the "insulation wall" to achieve the purpose of electrical isolation, so that the water inlet and outlet of the water heater can reach almost Zero voltage and extremely weak current below 0.02mA/kw.
The use of "isolation wall" technology can not only block the leakage that may be generated by the electric water heater itself, but also block the safety threats to showerers caused by electrified ground wires or electrified water pipes. Therefore, the water heater adopts "insulation wall" technology to fully ensure the safety of people's bathing.
Analysis:
1. "Water resistance attenuation isolation method"
Water - H2O itself is an insulator because there are impurities, metal substances and Other conductive substances make water no longer pure H2O, so it has a certain conductive ability. The resistance of water is related to the conductive substances in the water. The resistance of water is different in every place in our country. So how big should we use for anti-electricity walls? I don't think anyone can tell clearly. The feared anti-electricity wall is actually a small water channel inside a plastic body, which flows in a circuitous way to increase the length of the channel and extend the distance of the waterway in the insulating plastic body to increase the water resistance. According to the water quality characteristics, how long should this distance be? There is no definite conclusion. Generally, the length of the tunnel in the anti-electricity wall is 30 to 50 centimeters. The two halves are combined and separated by a sealing film. If the sealing film is aged and perforated, water will flow directly from the entrance to the outlet of the anti-electricity wall within a distance of less than 5 centimeters. Can I prevent electricity at this time? In fact, if the water nozzle of our water heater is made of plastic, plus a water outlet hose of about 1.5 meters, and the inside of the pipe is plastic insulated, then it will be a lightning protection wall of about 1.5 meters. Compared with that feared The distance of the anti-electricity wall is several times longer, the water resistance is greater, and it is safer. Therefore, when we choose an electric water heater, we must not choose a metal water nozzle for the sake of appearance.
2. "The use of 'insulation wall' technology can not only block the leakage that may be generated by the electric water heater itself, but also block the safety threats to shower users caused by electrified ground wires or electrified water pipes."
p>As mentioned above, the leakage of the electric water heater itself indicates the quality problem of the water heater itself. If the ground wire is electrified, then the shells of our other electrical appliances are also electrified. We dare not even touch the shells of all electrical appliances. I I want to ask: Should we take a shower first or turn on the phone and boil the water first? Of course, it is the first opportunity, that is, it comes into contact with the shell first. Can the anti-electricity wall work at this time? Besides, the air entering the home has already started to drop, and the user’s home cannot use electricity; what about the electrified water pipes? In the same way, we boil the water first, and then we can take a shower when the water comes out. Can the anti-electricity wall stop the electricity on the water pipe valve? Will our washing machine work? Do all the faucets work? Can it "fully guarantee people's bathing safety"? The danger may have occurred before taking a bath. It's like someone jumping off the 10th floor and the lifeguards installing an air mattress on the 11th floor. Therefore, the safety of our water heaters must be considered in its own structure and quality, rather than relying on safety problems. Even if you install 10,000 anti-electricity walls, you won't be able to solve the problem of electrified ground wires and water pipes. That is an environmental problem, and it is a problem that can only be solved by contacting relevant departments.
3. Many people are aware of the scene in which a well-known brand first threatened users with the danger of electric water heater leakage, and then launched an anti-electricity wall to make users rush to buy it.
This is what European and American countries call horror sales, but everyone ignores one question. He promoted the electric water heater as so scary and the anti-electricity wall was so good. Why did he not notify his former users to install additional anti-electricity walls when he launched the anti-electricity wall? Electric wall, why aren't its washing machines and other appliances equipped with anti-electric walls? But aren't its former users still alive and well?
3. Installation and use
1. Wrap raw material tape around the water heater inlet and outlet 2-3 times.
2. Place a sealing ring inside the insulation wall hole.
3. Installing insulation walls on both inlet and outlet pipes can prevent the risk of leakage inside and outside the water heater.
4. After the installation is completed, conduct a water test on the water heater to check whether there is any leakage in the insulation wall. If there is water leakage, tighten it appropriately until it does not leak. If water leaks, stop using it.
Four. Notes
1. The insulation wall has been sealed at the factory, and users are not allowed to dismantle it under any circumstances, otherwise they are responsible for all consequences incurred by the user.
2. If any leakage accident occurs under the condition that the user abides by the usage rules, regardless of whether there is a ground wire or not, as long as the insulation wall does not leak; and the top connector on the insulation wall and the water heater host part above it are not touched during use, personal safety can be guaranteed.
Analysis:
From the second point above, the results of the previous analysis can be fully confirmed, "As long as the insulation wall does not leak; the upper joints of the insulation wall and the The main part of the water heater can ensure personal safety. "What should I do if there is water leakage? The areas above the anti-electricity wall are not accessible. How can we use the water heater without turning it on? One sentence can only guarantee that the water outlet is not electrified, but if the user thinks it is safe, he can safely touch other places, and the result will be even more dangerous. Anti-electricity wall leakage means external and internal leakage of water. The external leakage can be seen, but the internal leakage, that is, the leakage in the middle of the sealing film, is invisible. The inlet and outlet are connected, which is the water channel with less than 5 centimeters of insulation mentioned above, so Water safety cannot be guaranteed either.
5. Main technical indicators
1. The leakage current is less than 1mA under 220V voltage (international standard 5mA), and you can take a bath even if there is leakage. (After the above analysis, is it still possible?)
2. Pressure-bearing 1.5MPa
3. Temperature resistant to 100 degrees Celsius
4. Water resistance is greater than or equal to 1MΩ
5. Standard 4-tap connector
So water heaters with anti-electricity walls are not necessarily really safe. Real safety must be a product that pays attention to quality, internal structure, craftsmanship, materials, etc. Anti-electricity can only be An auxiliary protection configuration. The safety of water heater products cannot be relied upon.