How should the ground wire of household appliances be connected? (Higher than the daily topic score)
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As the title suggests, many electrical appliances require a ground wire, but where should it be connected? This post was last edited by sister on 2009-2-23 22:31]
A separate wire can be connected to the heating pipe or water pipe to form a protective ground connection. However, this connection method is not scientific; if the pipeline grounding is poor, it may cause electric shock accidents. The best approach is to use an equipotential grounding terminal; this terminal should have its metal parts connected together using galvanized flat steel of large cross-section, and it should also be connected to the lightning protection grounding electrode as well as the neutral point of the power distribution transformer. This constitutes the most reliable zero-potential grounding terminal. This post was last edited by chinahbzq on 2009-2-23 21:17.]
Where is that neutral point you mentioned at home?
Lead the ground wire from the multi-functional socket to the water pipe or heating pipe (make sure to scrape off the paint from the area where the wire is connected). A fuse with a current rating of 0.15A should be connected in series (a fuse can also be used; the lower the rating, the better), or the thinnest copper wire will do as well (it must not be thicker than 0.10mm). This way, in the event of a leakage, no one will get hurt, as the fuse will blow quickly. Check regularly whether the fuse has blown; if so, it’s necessary to have someone investigate the cause of the leakage. Ordinary static electricity won’t cause the fuse to blow – there must be an internal grounding issue.
This neutral point refers to the transformer’s neutral point. Now, most buildings are equipped with equipotential grounding terminals. These terminals consist of galvanized flat steel strips with a large cross-section that connect the metal components together, and they are also connected to the lightning protection grounding system as well as the neutral point of the power distribution transformer; thus, they represent the most reliable zero-potential grounding solutions. As long as it is connected to the equipotential grounding terminal, electric shock accidents can be completely avoided.
Nowadays, most household power supply lines have a ground wire, which is connected to this wire; there are potential hazards in other areas.
The ground wire in household appliance plugs is extremely important for protecting people from electrical hazards. Without a ground connection, one must be careful; for example, if the casing of a rice cooker leaks electricity, it can pose a risk of electric shock. The ground wire should preferably be connected to the equipotential grounding terminal, which consists of a metal part made of galvanized flat steel with a large cross-section, and this part is connected to the neutral point of the distribution transformer. The ground wire must not be connected to gas pipes, water supply pipes, lightning rods, or telephone ground wires.
I agree with the opinion from the 6th floor; sometimes I’m worried that the decorators might cut this wire during home renovation.
In the installation of the grounding wire for electricity use in a household, it must be connected to the electrical panel in your home; all sockets and other devices must have a grounding wire in order to ensure electrical safety.
Home appliances are all powered by single-phase electricity, with an operating voltage of 220V. The power sockets installed in homes include the live wire, neutral wire, and ground wire. The power cords for home appliances are typically three-prong plugs that also include a ground wire. The sockets are connected according to the standard configuration: neutral on the left, live wire on the right, and ground wire at the top; the plug can be inserted directly into such sockets. In old residential buildings, the wiring for grounding is often not properly installed, or there is no grounding wire at all; these buildings require renovation by professional teams to have proper electrical wiring installed. In addition, circuit breakers with residual current protection should be used for electrical switches to prevent electric leakage accidents.
Find a larger and longer steel pipe or triangular bar, and drive it into the ground at a depth of about 70 cm. Make several threads on its surface; these will be used to insert wires into the areas of your home where grounding is required. Remember that the connection for the grounding wire must be reliable. The thickness of the main wire should be no less than that of the main power supply line in your home. For the branch wires, they can be of the same thickness as the power wires you intend to use. The resistance at all connection points, including the main wire, should not exceed 4 ohms! Be sure to water the area where the pipe or triangular bar is buried more often during dry weather!
I see that the one in our house is connected to the heating pipes.
Our electrical engineers have said that it’s necessary to connect the ground wire to an equipotential point, as this makes things safer. When renovating a home, be careful not to mix up the neutral and ground wires. Also, for electrically heated showers, it’s best to turn them off once heating is complete
New buildings may have grounding wires, but older buildings usually do not. The most practical approach is to connect it to the sewer or heating pipeline, ensuring a secure connection; however, the grounding wire must never be connected to gas or coal gas pipelines.
In fact, most houses have dedicated grounding wires as well as leakage protection devices; it’s just important not to modify them arbitrarily during renovation. For old buildings that lack a dedicated grounding wire, it is very difficult to make modifications; it is best to renovate the entire building. Fortunately, there aren’t many such houses left these days
Typically, there are three wires in the power supply lines that enter a household: the live wire, the neutral wire, and the ground wire. The one in the middle of the three-hole socket is used for connecting the ground wire. In the case of ordinary household appliances (where the wire in the middle of the three-prong power plug is connected to the conductive part of the appliance’s casing), when the casing comes into contact with something, the leakage current is carried away through the ground wire. This not only protects people and equipment from harm but also, by creating a circuit with the ground, triggers the protective device on the live wire to cut off the fault current. It enables timely detection of electrical leakage incidents and prompt resolution. In many old buildings, there used to be no such ground wire. In such cases, if electrical leakage occurred in household appliances, two situations could arise: either the appliance’s casing was conductive and in effective contact with the ground, which functioned as a ground connection, allowing people to detect the leakage issue promptly and fix it; or... There are also household appliance casings that are non-conductive; in the event of an electrical fault, since no circuit can be formed with the ground, such faults cannot be detected or eliminated. When a person accidentally comes into contact with the conductive parts of the appliance, leakage current will flow through the person into the ground, which is extremely dangerous. (If the appliance is grounded, the person and the grounding wire are in parallel, and since the resistance of a human body is high, the electrical current flowing through the body is much smaller.) It can’t be said that being grounded means it’s safe; it’s only relatively safe. Proper use of electrical appliances and timely elimination of potential electrical hazards are essential to ensure electrical safety. No fault current is generated, and for protection purposes it makes no difference whether grounding is used or not. However, as is well known, household appliances can experience insulation failure due to aging, which can lead to leakage currents; therefore, grounding is still necessary as a precaution. In other words, with the presence of fault currents, it is dangerous whether or not you ground the system; grounding simply allows you to detect the fault currents more promptly (making things relatively safer). In fact, safety can only be achieved by eliminating potential electrical hazards :loveliness:
For household appliances, it is sufficient to connect the metal casing to ground and install a leakage protector. The enclosure should be connected to the neutral wire; in the current three-phase five-wire system, this means connecting it to the dedicated protective ground wire!
Electrical appliances that require grounding use three-prong plugs; they can be plugged into three-prong sockets, provided that the ground wire of those sockets is connected during installation (although it’s possible that some unscrupulous sellers fail to do so)
Our approach is to drive iron stakes into the ground, usually at a depth of around 20-40 centimeters, and then connect the grounding wire of household electrical appliances to them.
Use a three-wire cable and a three-prong plug, ensure proper wiring; the neutral wire should not pass through switches or circuit breakers:handshake
At each floor level, there is a equipotential box; this serves as the connection point for grounding the main reinforcement in that floor as well as electrical equipment. The casings of electrical devices, along with the neutral point and casings of small transformers, are all grounded to this point. For safety reasons, it is absolutely not advisable to connect it to the radiator. Radiators are grounded, but their grounding may not be very effective.