1. Why should the lighting switch be connected to the fire line? 2. How to install a single-phase three-hole socket? why? Generally, single-phase electrical equipment, especially mobile electrical equipment, should use a three-pin plug and a three-hole socket. There is a special protective zero (ground) jack on the three-hole socket. When using zero-connection protection, it is often only directly connected to the hole terminal in the socket bottom and the zero wire that is introduced into the socket. Extremely dangerous. Because if the neutral line of the power supply is disconnected, or the fire (phase) line and the neutral line of the power supply are reversed, the metal part such as the outer casing will also carry the same voltage as the power supply, which will result in electric shock. Therefore, the dedicated grounding jack for wiring should be connected to a dedicated protective grounding wire. When using zero-connection protection, the zero line should be specifically drawn from the power supply terminal, and should not be used near the neutral line of the socket. 3. Why is it not strictly buried in the wall? (1) After long-term use of plastic insulated wires, the plastic will age and crack, and the insulation level will be greatly reduced. When the line is short-time overload or short-circuit, it is easier to accelerate the insulation damage. (2) Once the wall is wet, it will cause large-area leakage and endanger personal safety. (3) The plastic insulated wire is directly buried in the dark, which is not conducive to line maintenance and maintenance. 4. Why use a leakage protector? Leakage protector, also known as leakage protection switch, is a new type of electrical safety device whose main uses are: (1) Prevent electric shock accidents caused by electric equipment and electrical line leakage. (2) Prevent single-phase electric shock accidents during power consumption. (3) Cut off the single-phase ground fault in the operation of electrical equipment in time to prevent electrical fire accidents caused by leakage. (4) With the improvement of people's living standards, the number of household appliances is increasing. In the process of using electricity, due to defects in electrical equipment, improper use and unfavorable safety technical measures, personal electric shock and fire accidents give life to the people. And the property has brought undue losses, and the appearance of leakage protectors provides reliable and effective technical means for preventing the occurrence of various accidents, cutting off the power supply in time, protecting equipment and personal safety. 5. What is the main reason for an electric shock accident? Statistics show that the main causes of electric shock accidents are as follows: (1) Lack of electrical safety knowledge, fly a kite near the high-voltage line, climb the high-voltage pole and smash the bird's nest; after the low-voltage overhead line is broken, do not stop using the hand to pick up the fire line; the night-time electrified wiring hand touches the charged body; Rubber cover knife brake. (2) Violation of the operating procedures, connecting the line or electrical equipment without taking the necessary safety measures; touching the damaged equipment or wires; accidentally charging the live equipment; charging the lighting fixtures; charging the electric tools; charging the mobile electrical equipment; Wet hand twisting the bulb and so on. (3) The equipment is unqualified, the safety distance is not enough; the grounding resistance of the second-line and one-ground system is too large; the grounding wire is unqualified or the grounding wire is disconnected; the insulation-damaged wire is exposed to the outside. (4) The equipment is in disrepair, the wind blown line or the scraping pole is not repaired in time; the bakelite damage of the rubber cover knife gate is not changed in time; the motor wire is damaged, so that the outer casing is charged for a long time; the porcelain bottle is broken, so that the phase line and the pull wire are short-circuited. The device housing is live. (5) For other accidental reasons, walking at night touches the live conductor that has fallen off the ground. 6. What ambulance measures should be taken when an electric shock occurs? In the event of an electric shock, while ensuring the safety of the rescuer, you must first try to get the electric shocker out of the power supply quickly, and then carry out the following repair work. (1) Untie the tight clothes that hinder the breathing of the electric shock. (2) Check the mouth of the electric shocker and clean the mucus in the mouth. If there is a denture, remove it. (3) Immediately carry out the rescue on the spot, such as breathing stop, using mouth-to-mouth artificial respiration to rescue, if the heart stops beating or irregular vibration, artificial chest extrusion method can be used to rescue. It must not be interrupted without cause. If there is a second person present in addition to the rescuer on site, you should immediately do the following: 1) Provide tools and equipment for first aid. 2) Dismiss the on-site staff. 3) Keep the site with enough lighting and keep the air flowing. 4) Report to the leader and ask the doctor to come to the rescue. Experimental studies and statistics show that if treatment is started 1 minute after the electric shock, 90% can be saved; if rescue is started 6 minutes after the electric shock, only 10% of the rescue opportunities will be available; and 12 minutes after the electric shock, the rescue will be started. The possibility of saving is extremely small. Therefore, when someone is found to have an electric shock, they should race against time and use everything. [Electrical Encyclopedia: Thirty-seven common sense that weak people must know]: 1. Why should the lighting switch be connected to the fire line? If the lighting switch is installed on the zero line, although the light is not turned off when the light is off, the phase line of the light head is still turned on, and people think that the light is not bright, it is mistakenly considered to be in a power-off state. In fact, the voltage on the ground at each point on the luminaire is still 220...the way. 7. What are the measures for household safety? With the popularization and application of household appliances, it is of vital importance to correctly grasp the knowledge of safe electricity use and ensure the safety of electricity use. (1) Do not buy "three no" fake and shoddy household products. (2) When using home appliances, there should be a complete and reliable power cord plug. Grounding protection is required for household appliances in metal enclosures. (3) Switches and fuses cannot be installed on the ground and neutral lines. Do not connect the ground wire to the tap water or gas pipe. (4) Do not touch live equipment with wet hands. Do not wipe the live equipment with a damp cloth. (5) Do not pull the wires randomly, do not move the live equipment. (6) When inspecting and repairing household appliances, the power must be disconnected first. (7) When the power cord of the household appliance is damaged, replace it immediately or wrap it with insulating cloth. (8) When a household appliance or electric wire is involved in a fire, the power should be disconnected before the fire is extinguished. 8. How to prevent burning of household appliances? The commonly used household appliances are rated at 220 volts and the normal supply voltage is around 220 volts. When the power supply line is instantaneously increased due to natural disasters such as lightning strikes, the three-phase load unbalanced household line is in disrepair, the voltage is increased due to the phase voltage rise caused by human error wiring, etc. This will increase the current and cause the household appliance to burn out due to overheating. To prevent burning of household appliances, we must start from the following aspects: First, the electrical equipment should be disconnected from the power supply when not in use; second, the old and damaged repair line should be modified; third, the over-voltage protection leakage switch should be installed. 9. How to choose the fuses for households? The fuses used by households should be selected according to the size of the electricity used. If using a meter with a capacity of 5 amps, the fuse should be greater than 6 amps and less than 10 amps; if using a meter with a capacity of 10 amps, the fuse should be greater than 12 amps and less than 20 amps, that is, the fuse should be 1.2~ of the meter capacity. 2 times. The fuses to be used should be one that meets the requirements, and cannot be used in combination with a small-capacity fuse. 10. What are the basic requirements for a leakage protector? Technically, the following requirements should be met: (1) The sensitivity of the electric shock protection should be correct and reasonable, and the general starting current should be within the range of 15~30 mA. (2) The operating time of the electric shock protection should not exceed 0.1 second under normal circumstances. (3) The protector should be equipped with the necessary monitoring equipment to prevent loss of protection when the operating state changes. For voltage-type electric shock protectors, a neutral-lined device should be installed. 11. How to prevent electrical fire accidents? What should I do after a fire? First of all, when installing electrical equipment, quality must be guaranteed and the requirements for safety and fire protection should be met. To use qualified electrical equipment, broken switches, lamp caps, and broken wires cannot be used. The connectors of the wires should be firmly connected according to the specified connection method and wrapped with insulating tape. Tighten the screws to the wiring pile heads and terminals to prevent poor contact due to loose wiring. After the electrician installs the equipment, it does not mean that it can be done once and for all. If the user finds that the lamp cap and socket wiring are loose during the use process (especially the wiring of the mobile electrical plug is easy to loose), the contact is poor or there is overheating, and the electrician should be dealt with in time. . Secondly, do not place oily, cotton, wood chips, wood and other dyeable items near low-voltage lines and switches, sockets, and fuses. Before the electric fire, there is a kind of precursor, it is necessary to pay special attention to it. That is, the electric wire will burn the insulating outer skin first due to overheating, and it will emit an unpleasant smell of burning rubber and burning plastic. Therefore, when smelling this smell, you should first think of it may be caused by electrical reasons. If you can't find other reasons, you should immediately turn off the power and shut down the power until the cause is found. After proper handling, the power can be turned on. In the event of a fire, whether it is caused by electrical or not, you must first find a way to quickly cut off the power supply within the fire. Because if the fire is caused by electrical problems, the power supply is cut off, and the fire source is cut off. If the fire is not caused by electrical electricity, the insulation of the wire will be burned. If the power is not cut off, the burnt wire will cause Short-circuiting the line, causing a wider range of wires to catch fire. After an electrical fire, cover soil, sand or fire extinguisher should be used, but foam fire extinguishers should never be used, so the fire extinguishing agent is electrically conductive. 12, household safety electricity common sense (1) Each household must have some necessary electrical appliances, such as electroscopes, screwdrivers, rubber pliers, etc., and must also have fuses and fuses of various specifications suitable for the use of household appliances. (2) Each household electric meter must be equipped with total insurance before it, and the main knife and leakage protection switch should be installed after the meter. (3) In any case, it is strictly forbidden to use copper or iron wire instead of fuse. The size of the fuse must match the power usage. When replacing the fuse, remove the porcelain cover and replace it. Do not directly connect the fuse in the porcelain box. Do not replace the fuse under the condition of charging (the knife is not opened). (4) After the fuse or the leakage switch is activated, the cause must be identified before the switching power supply can be closed. Under no circumstances should the wire be used to short-circuit the fuse or press the leakage switch tripping mechanism for forced power transmission. (5), purchase household electricity [Electrical Encyclopedia: thirty-seven common sense that weak people must know]: 1, why should the lighting switch be connected to the fire line? If the lighting switch is installed on the zero line, although the light is not turned off when the light is off, the phase line of the light head is still turned on, and people think that the light is not bright, it is mistakenly considered to be in a power-off state. In fact, when the voltage on the ground of each point on the luminaire is still 220..., you should carefully check whether the technical parameters (such as frequency, voltage, etc.) of the product specification meet the local power requirements. It is necessary to know whether the power consumption and the existing power supply capacity of the family meet the requirements, especially whether the wiring capacity, plugs, sockets, fuses, and electric meters meet the requirements. (6) When the household electrical distribution equipment cannot meet the capacity requirements of the household appliances, it should be replaced and modified, and it is strictly forbidden to use it. Otherwise, overloading can damage electrical equipment and may cause electrical fires. (7), the purchase of household appliances should also understand its insulation properties: general insulation, reinforced insulation or double insulation. If it is grounded for leakage protection, the grounding wire is essential. Even for insulated or double insulated electrical equipment, it is beneficial to protect the ground or protect the zero. (8) Household appliances with electric motors (such as electric fans) should also know the heat resistance level and whether they are running continuously for a long time. Pay attention to the heat dissipation conditions of the household appliances. (9) Before installing household appliances, please check the requirements of the product specification for the installation environment, pay special attention to the installation of household appliances in an environment with damp heat, dust or flammable, explosive and corrosive gases under possible conditions. . (10) When laying indoor wiring, the phase and neutral lines should be clearly marked and consistent with the wiring of household appliances, and must not be connected to each other. (11), household appliances and power supply connection, must use a switchable or plug-in connector, it is forbidden to insert the wire directly into the socket hole. (12) For household appliances that require protective grounding or security to be connected to zero, three-pin plugs and three-eye sockets should be used. Do not use two-pin plugs and two-eye sockets instead, resulting in a ground (or zero) line gap. (13) It is best to have no joints in the middle of the household wiring. When there is a joint, it should be firmly contacted and wrapped with an insulating tape, or a porcelain junction box. The medical tape is replaced by a medical tape to replace the electrical tape. (14), the connection between the wire and the switch, the knife gate, the fuse box, the lamp holder, etc. should be firm and reliable, and the contact is good. The multi-soft soft copper wire joint should be twisted and then placed under the joint screw gasket to prevent the thin strand from spreading and causing a short circuit on the other joint. (15), household wiring should not be directly laid on flammable building materials, if you need to route on the wood must use porcelain beads or porcelain clips; through the wood must use porcelain casing. Do not use flammable plastics and other flammable materials as decorative materials. (16), the grounding or the zeroing line is not charged when it is normal, but if the electric leakage occurs after the disconnection, the outer casing of the right electric appliance will be charged; if it is short-circuited, the grounding wire will also pass a large current. For its safety, the grounding (zero) wire size shall not be less than the phase conductor, and no switch or fuse shall be installed on it or a joint shall be provided. (17), the grounding wire should not be connected to the water pipe (because the tap water pipe is now plugged with insulating tape, there is no grounding effect); it should not be connected to the gas pipe (to prevent gas explosion caused by electric spark); On the ground of the telephone line (to prevent strong electricity and weak electricity); also not to be connected to the lightning protection line (to prevent lightning strikes). (18) All switches, knife gates and fuse boxes must be covered. If the bakelite cover is aged or incomplete, it must be replaced. Dirty people must be wiped clean before using them. (19), do not drag the power cord on the ground to prevent the power cord from smashing and prevent damage to the insulation. (20) Before using the household appliance for trial use, all switches and buttons should be placed in the original stop position, and then operated in the order of opening and closing operations as required by the manual. If there are moving parts such as moving head fans, you should consider enough space for exercise in advance. (21) If the household appliance is found to have abnormal conditions such as sparking, smoking or burnt smell after power-on, stop immediately and cut off the power supply for inspection. (22) When moving household appliances, be sure to cut off the power to prevent electric shock. (23), around the heating appliances must be away from flammable materials. Electric stoves, heating stoves, electric irons and other heating appliances should not be placed directly on the board to avoid fire. Aspheric Lens,Standard Aspheric Lens,Positive Meniscus Lenses,High Precision Aspheric Lens Danyang Horse Optical Co., Ltd , https://www.dyhorseoptical.com
If the lighting switch is installed on the zero line, although the light is not turned off when the light is off, the phase line of the light head is still turned on, and people think that the light is not bright, it is mistakenly considered to be in a power-off state. In fact, the ground voltage at each point on the luminaire is still a dangerous voltage of 220 volts. If people touch these actually charged parts when the light is off, it will cause an electric shock. Therefore, the switches of various lighting switches or single-phase small-capacity electrical equipment can only be secured if they are connected in series on the fire line.