Electric water heaters bring great convenience to people's lives, but also bring security risks. Many people have misunderstandings about the use of electric water heaters, so that it is often questioned in the process of use, why do you still have problems with safety measures? Today, we will come up with the misunderstandings of those electric water heaters and help everyone to have a better and safer hot bath.
Electric water heater misunderstanding that this is safe
Misunderstanding 1, pull out the plug on everything
Some people will think that the safety problems of water heaters are mostly related to electricity, so when you use them, unplug the power cord. Is this not a problem? There are still certain hidden dangers in this seemingly solution to everything, and it cannot be said absolutely that there will be no security problems.
In addition to connecting the circuit, the water heater is inevitably connected to the water pipe. In some buildings that are badly grounded or not grounded at all, some people will connect the grounding line to the water pipe so that the water pipe acts as a grounding for the building. In this case, if there is a leakage of electricity in one household's home, the entire building's water pipe will be energized, and users who are using a water heater to bathe, even if they unplug the water heater, will still be injured by the current introduced by the water pipe.
Myth #2: Using a Qualified Electric Water Heater Does Not Represent Safe BathingWith the increasing popularity and maturity of electric water heaters in the Chinese market, the entire electric water heater industry claims that the issue of electricity safety has been fully resolved. Consumers are also more convinced of this argument, that the products of electric water heaters are qualified, and bathing will not have any worries. However, the recent electric shocks caused by a series of "qualified water heaters" can not help but ask questions: Is it really safe to use a qualified water heater? What caused the accidents?
The standard for electric water heaters in China is equivalent to the European IEC (International Electrotechnical Commission) standard, which requires that the ground wire in the user's home must be good. In our country, due to historical reasons, many buildings’ grounding systems are not good or even lacking. For example, it is possible to install the wrong wiring, the aging of the lines, the private cables, the use of poor quality switch sockets, and the use of water pipes as grounding cables. Caused by the ground live, causing electric shock accidents. For this, consumers do not know. In this environment of use, even a water heater that passes the IEC inspection cannot guarantee safe bathing.
Many people think that with leakage protection, there is no need to worry about bathing safety. In fact, such awareness is also a misunderstanding. To explain this misunderstanding, we must first understand the working principle of the leakage protector: The live and neutral wires in the power cord enter the water heater through the leakage protector. In the working state of the water heater, once an internal electrical device is leaked, the leakage protector is The power can be turned off within 0.1 second to prevent the current from continuing to enter the interior of the water heater.
However, the water heater's power cord also contains a ground wire that does not pass through the earth leakage protector. In theory, the ground wire is also set to ensure the safety of electricity, but in case of renovation, the FireWire ground wire is reversed, the line is aging, etc. Because the ground wire does not pass through the earth leakage protector, the electric current may directly drive into the water heater through the ground wire, and electric shock accidents are still inevitable.
water heater
1.cylindrical milling cutter
Used for processing flat surfaces on horizontal milling machines. Cutter teeth are distributed on the circumference of the milling cutter, and are divided into straight teeth and spiral teeth according to tooth shape. According to the number of teeth and coarse teeth and two kinds of fine teeth. The helical tooth rough tooth milling cutter has fewer teeth, high tooth strength and large chip space, which is suitable for rough machining. Fine-tooth milling cutters are suitable for finishing.
2. face milling cutter
Also known as disc milling cutter, used for vertical milling machine, end milling machine or gantry milling machine processing plane, end face and circumference have cutter teeth, also have coarse teeth and fine teeth. The structure has three kinds: integral type, insert type and transferable type.
3. End milling cutter
Used for processing grooves and step surface, knife teeth in the circumference and end face, can not work along the axial feed. When the end mill has end teeth through the center, axial feed can be provided.
4. Three-side edge milling cutter
Used for processing all kinds of grooves and steps, its two sides and circumference are provided with cutter teeth.
5. Angle milling cutter
For milling grooves at a certain Angle, there are two kinds of single Angle and double Angle milling cutters.
6.Saw Blade milling cutter
Used for machining deep grooves and cutting off workpieces, there are more cutter teeth on the circumference. In order to reduce the friction during milling, there are 15 '~1° auxiliary Angle on both sides of the cutter teeth. In addition, there are keyway milling cutters, dovetail slot milling cutters, T - shaped slot milling cutters and various forms of milling cutters.
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