News & Insights

The difference between wall switch socket junction box and junction box: the plastic bottom box is located in the wall, while the junction box is on the surface of the wall.
1. The junction box is the crossing transition box that must be set when the length of the pipeline in the electrical piping line, the distance and number of elbows of the pipeline exceed the specified distance and the number of elbows, and the pipeline has branches. The box from the pipeline to the load terminal is reserved, which are all junction boxes. Its function is to facilitate threading, branching and transition wiring.
2. Switch box, socket bottom box and lamp box are terminal bottom boxes for these three kinds of installation. They are used for installing fixed panels and wiring in the box when installing lamps, switches and sockets.
3. Although the junction box and switch box belong to auxiliary materials in electrical installation engineering, they are in separate junction boxes In the sub item of installation quota of switch box, it really belongs to unpriced main materials, and the unit price of main materials needs to be entered.
4. Junction box and switch box, whether metal box or PVC plastic box, are widely used in installation engineering at present, that is, the box surface is 86mm wide and the box depth is 50mm.
5. When calculating the junction box, the lamp cap box, socket box and switch box are calculated according to the actual number of drawings. The sub junction box must transition when the pipeline branches or returns to the pipe. When the straight-line distance of the pipeline and the number of elbows exceed the requirements specified in the specification, the junction box must be added, and finally calculated according to the actual number.

1. The power socket should be a product that has been inspected and qualified by the relevant national product quality supervision department. Generally, mid-to-high-end products with flame-retardant materials should be used, and low-grade, fake and inferior products should not be used;

2. Electrical power sockets in residences should be safe sockets, and splash-proof sockets should be used in wet places such as toilets;

3. The rated current of the power socket should be greater than 1.25 times the rated current of the known equipment used. Generally, the rated current of single-phase power socket is 10A, and the special power socket is 16A. The power distribution circuit and connection method of special high-power household appliances should be selected according to the actual capacity;

4. For the convenience of plug-in, a 86mm×86mm unit panel, the number of combined sockets should be two, and the maximum (including switches) should not exceed three, otherwise 146 panel multi-hole sockets are used;

5. For household appliances (such as washing machines) that have a risk of electric shock when plugging in the power supply, a socket with a switch to disconnect the power supply should be used.

6. In a relatively humid place, the waterproof box should be installed at the same time when installing the socket.

Flame retardant will not prevent burning, only how long it can “resist” burning.

In other words, this material will not be “ignited” at the beginning of the fire, giving the fire extinguisher some time to “create”. Of course, if it continues to burn, it will still be “ignited”.

Flame retardant materials also have different levels of fire resistance time.

For indoor electrical products, it is only required to meet the flame-retardant level requirements in the corresponding standards, and there are no additional special requirements. For sockets, the flame-retardant level that meets the standard level is a qualified product, and it is not required to be in When using a special fire source such as a lighter for ignition, it must not continue to burn. In fact, many of our indoor items such as clothing, wooden furniture, bedding, books and papers are flammable, so it is meaningless to require electrical products to be completely inflammable. Safety is relative, and there is no real absolute safety. As long as it reaches the flame retardant level specified by the standard, it has certain characteristics of hindering combustion compared to flammable materials, and it is a safe product.

Understanding of any one thing cannot be separated from the premise and environment of the event itself. What is the use environment of the socket? What is the purpose of the socket?　The sockets commonly referred to are mobile sockets or fixed sockets for household and similar purposes. This type of socket is “suitable for use in an ambient temperature that usually does not exceed 35°C and occasionally reaches 40°C” (excerpted from the Chinese national standard GB2099.1-2008 “Household and similar plugs and sockets Part 1: General requirements”), this environment It is the main environment of common people’s home life. This is the major premise and general environment for the use of socket products. Talking about safety without this premise will lose its practical significance.

Because household and similar sockets are not industrial sockets after all, nor are they explosion-proof sockets for hazardous locations (such as mines and aerospace). It is also not possible to use a lighter to ignite the socket, because the socket simply cannot be used in, and is not suitable for, the high temperature environment of nearly a thousand degrees Celsius similar to a lighter.　Furthermore, the mobile socket is for the extended use of the power source, which is actually equivalent to the extension of the wire or cable. How can it be required that the wire and cable withstand the high temperature of a lighter of nearly 1,000 degrees Celsius? From a technical point of view, it is not impossible to do it, but precious national resources will be wasted, there will be expensive prices, and it does not have much practical significance.

Method/Step

1. Before replacing the socket, be sure to turn off the circuit breaker of the socket. If you are not sure which circuit breaker controls the socket, turning off the main switch is the safest method.

2. The fixing screws are generally not visible on the exterior of the wall socket. You need to open the cover of the socket to see the screws. There are one or two small openings on the side of the cover, you need to use a flat-blade screwdriver to slowly pry open.

3. After opening the cover, you will find a screw on the left and right of the wall switch, you need to use a screwdriver to unscrew it.

4. After unscrewing the screws, do not rush to remove the wires with a screwdriver. First, use an electric pen to measure whether the circuit is live, and then unscrew the terminals after confirming that it is not live.

5. When replacing a new socket, the normal wiring method is the neutral wire on the left, the live wire on the right, and the ground wire on the upper side, which is often called “left zero and right fire”. The blue line is generally used for the zero line, the red line is generally used for the live line, and the yellow-green flower line is generally used for the underground. We just need to connect it according to the wiring method before disassembly.

6. After the connection terminals are tightened, screw the entire wall socket on the connection box, and buckle the cover on the socket body, which is beautiful and not easy to rust the screws.

The location and number of power sockets are determined to facilitate the use of household appliances. The beauty of interior decoration plays an important role. The layout of power sockets should be carried out according to the planned location of indoor household appliances and furniture, and close attention should be paid to the cooperation with relevant professions such as building decoration to determine the correctness of the socket location.

1. The power sockets should be installed on no less than two symmetrical walls. The horizontal distance between the two power sockets on each wall should not exceed 2.5m~3m, and the distance from the end wall should not exceed 0.6m.

2. Ordinary power sockets without special requirements should be installed 0.3m away from the ground, and special sockets for washing machines should be installed 1.6m away from the ground, with indicator lights and switches;

3. The air conditioner should use a dedicated power socket with a switch. In the case of a certain type of air conditioner, the power sockets of the air conditioner should be arranged in the following positions:

①The power socket of the split type air conditioner should be set at 1.8m from the ground according to the position of the reserved hole of the outlet pipe;

②The power socket of the window air conditioner should be set at a place 1.4m from the ground beside the window;

③The power socket of the cabinet type air conditioner should be set at the corresponding position 0.3m away from the ground. Otherwise, consider reserving 16A power sockets for split air conditioners, and install them on the load-bearing wall near the outer wall or near the daylighting window.

4. In all rooms equipped with cable TV terminal boxes or computer sockets, at least two five-hole combination power sockets should be arranged next to the cable TV terminal boxes or computer sockets to meet the needs of TV, VCD, audio power amplifier or computer. Use multifunctional combined power sockets (at least 3 to 5 different two-hole and three-hole sockets are arranged on the panel), and the horizontal distance between the power socket and the cable TV terminal box or the computer socket is not less than 0.3m;

5. The living room (living room) is the main activity place where people are concentrated. There are many household appliances. The design should be based on the layout of the building decoration layout, and it should be ensured that there are power sockets on each main wall. If the wall length exceeds 3.6m, the number of sockets should be increased. The wall length is less than 3m, and the power socket can be set in the middle of the wall. There are power sockets next to the cable TV terminal box and computer sockets, and power sockets for the air conditioner. Power sockets with switches should be used in the living room;

6. The bedroom should ensure that the two main symmetrical walls are equipped with combined power sockets. When the end of the bed is against the wall, both sides of the bed should be equipped with combined power sockets and air-conditioner power sockets. There should be two sets of combined power sockets beside the cable TV terminal box and the computer socket, and only the power socket for the computer should be provided in the single bedroom;

7. In addition to the wall where the bookcase is placed, the study should ensure that the two main walls are equipped with combined power sockets, and equipped with air-conditioner power sockets and computer power sockets;

8. The kitchen should be equipped with multiple power sockets at different locations and heights according to the layout of the building decoration to meet the needs of range hoods, disinfection cabinets, microwave ovens, rice cookers, electric water heaters, refrigerators and other electric cooking appliances. Refer to the layout of the stove, operating table, counter, and washing table to select the best position to set the range hood socket, generally 1.8m~2m from the ground. The electric water heater should use a 16A three-wire socket with switch and install it on the right side of the water heater 1.4m~1.5m from the ground. Be careful not to install the socket above the electric heater. The power sockets of other electric cookers are set at different positions and heights under the wall cabinet or above the operating table. The sockets should be equipped with power indicator lights and switches. When installing a refrigerator in the kitchen, a special socket should be installed, 0.3m~1.5m away from the ground;

9. It is strictly forbidden to install power sockets in the wet places in the bathroom, such as the shower area or the bathtub. The power sockets in other areas should be splash-proof. When there are external windows, the exhaust fan junction box or socket should be reserved beside the external window. Since the exhaust air duct is generally near the shower area or bathtub, the junction box or socket should be installed at least 2.25m from the ground. Reserve electric water heater sockets and power sockets for bidets 0.6m away from the shower area or the outer edge of the bathtub. Set up power sockets for beauty and shaving beside the sink mirror, 1.5m~1.6m from the ground. The socket should be equipped with a switch and indicator light;

10. The balcony should be provided with a single-phase combined power socket, 0.3m from the ground.

Although the switch socket is not a “big piece” like home appliances, it is related to the daily safety of the family, and it is the first line of defense to ensure the household electrical safety, so you must not be sloppy when choosing a switch socket. Electrical experts specially reminded that different types of switches and sockets are matched in different places. For families with children, in order to prevent children from touching the socket holes with their fingers or metal objects, they should choose a safety socket with a fuse.

①The position is too low

When installing sockets in many families, they feel that they are too high to be aesthetically pleasing, and they will be installed in a lower concealed position. However, Dr. Xia Dong from the Institute of Electrical Engineering of the Chinese Academy of Sciences said that it is easy for water to splash into the socket when mopping the ground, which may cause an electric leakage accident. According to industry regulations, the distance between the exposed socket and the ground should not be less than 1.8 meters; the distance between the concealed socket and the ground should not be less than 0.3 meters. The sockets of the kitchen and bathroom should be at least 1.5 meters above the ground, and the sockets of the air conditioner must be at least 2 meters above the ground.

②Install at will

The power wire must use a copper wire cross-section. If you live in an old house, you must replace the original aluminum wire with copper wire. Because the aluminum wire is very easy to oxidize, the joints are easy to catch fire. A survey has shown that the incidence of electrical fires in residential buildings that use aluminum wires is dozens of times higher than that of copper wires. In addition, in order to be beautiful, many families will use slotted and buried wires and concealed pipe laying methods. Xia Dong reminds that the principle of “live wire into the switch and neutral wire into the lamp holder” must be followed when wiring, and leakage protection should be provided on the socket. Device.

③Lack of protection

There are often water and oily smoke in the kitchen and bathroom, so it is best to install a splash-proof box or plastic baffle on the socket panel.

In addition, when some decoration companies install three-hole sockets, they often leave the ground wire empty, and even connect the ground wire directly to the gas pipe. Professionals pointed out that these practices are very dangerous. The ground wire is connected to the electrical shell. Once the electrical leakage occurs, it will cause electric shock.

④Share

This practice will overload the electrical appliances and cause a fire. It is best to use independent sockets for high-power electrical appliances such as air conditioners, washing machines, and range hoods. Generally speaking, it is best to install 4 sets of sockets in the bedroom, one set per 2.5 square meters in the living room, and one set per 1.2 square meters in the kitchen.

⑤Less loops

The old house has only one circuit. Once any circuit is short-circuited, the electricity consumption of the entire room will be paralyzed. Generally speaking, two or three circuits can be selected for the socket, one circuit for the kitchen and bathroom, and one circuit for the air conditioner.

⑥Use the old national standard

Universal socket, that is, the socket can be compatible with two poles or three poles at the same time, and even sockets with non-daily use plugs such as the British standard, the American standard, and the European standard. However, due to the large jacks of this type of socket, the contact area between the socket tabs and the electrical plug is too small, which easily causes the contact tabs to overheat and cause fire accidents.

Two-core sockets are easier to distinguish from the appearance. All products with three-pole sockets on the plug-in board, but only two pins on the plug that comes with the socket, are two-core problem sockets. This type of socket lacks a ground wire. During use, once an insulating component inside the appliance is damaged, the current will cover the entire surface of the appliance. Since the current cannot be introduced into the ground through the two-core socket, it is very easy to cause an electric shock.

Flame retardant refers to the addition of flame retardant to the product to achieve the flame retardant effect. The national standard stipulates that the panel is burned with 850 degrees glowing wire for 30 seconds. After the glowing wire leaves the panel, the open flame can be automatically extinguished within 30 seconds, and the combustion will melt. Drips will not cause the silk paper and pine boards to catch fire, and the flame retardant is considered qualified.