1. Common sense of safe use of household appliances
(1) When buying household appliances, you should buy qualified products certified by the country, and do not buy fake and inferior products with "three noes". Read the product manual carefully after purchase, pay attention to the voltage and power used, and should not exceed the allowable load of the household power socket, fuse, electric meter and wire before use
(2) When installing household appliances, pay attention to the use environment of the appliances. Do not install household appliances in a humid, heat source, dusty, flammable and corrosive environment.
(3) Kitchens, storage rooms and other places prone to moisture and corrosiveness should be checked frequently for leakage. Generally, an electroscope can be used to test on walls, floors, and equipment enclosures.
(4) When using household appliances, you must have a complete and reliable power cord plug. Do not plug the wires directly into the socket. Do not use two-pin plugs and two-pin sockets instead of three-pin plugs and three-pin sockets to prevent household appliances from being connected incorrectly. The metal shell is energized and an electric shock accident occurred.
(5) Electric heating equipment, such as electric heaters, electric stoves, electric heaters, electric showers, electric irons, electric soldering irons, etc., these devices have large current and high heat, so they should be operated by their own switches, and plug operation is strictly prohibited , And the capacity of the socket should meet the requirements
(6) Switches and fuses are not allowed to be installed on the ground and neutral wires. It is forbidden to connect the ground wire to tap water, gas, heating and other pipes.
(7) When household appliances are in use, do not touch the switch and shell with wet hands. Use electric hair dryers, soldering irons and other electrical appliances, and do not wind the wires around your hands. When moving electrical appliances, cut off the power supply and do not pull the wires by hand. (8) Do not pull wires and connect electrical equipment indiscriminately, and do not use the "one wire, one ground" method to connect electricity.
(9) When the insulation of the power cord of the household appliance is damaged, it should be wrapped with an insulating cloth. It is forbidden to wrap it with medicinal tape such as damp and pain relief ointment.
(10) After using the household appliances, cut off the power at any time. When you need to cut off the power supply in an unexpected emergency, you must use electrician's pliers to cut the wires, and do not pull the wires forcibly.
(11) Do not fly kites, shoot birds, or install antennas near power lines, and do not tie livestock to poles and cables. Do not dig pits or take soil near poles and cables to prevent the poles from breaking.
(12) If the electrical equipment is found to be faulty or leaking and causing fire, immediately turn on the power switch. Before cutting off the power, do not use water or acid or alkali foam fire extinguishers to extinguish the fire.
(13) Do not dry clothes on the wires to prevent electric shock caused by insulation damage and leakage.
(14) When the wire is disconnected, do not approach it. The 6-10kV high-voltage wire should be at least 10m away from the wire drop location, and report to the relevant department for repair in time.
(15) Do not touch the lamp socket, switch and socket with wet hands. When replacing the bulb, first turn off the switch, and then stand on the dry insulation. Do not pull the light cord too long or pull it everywhere.
(16) Female mouths should immediately cut off the power supply or use dry wooden sticks, bamboo poles and other insulators to open the wires if they find someone getting an electric shock. If the electrocution person is unconscious and breathing has stopped, artificial respiration should be performed immediately and sent to the hospital as soon as possible.
(17) When excavating the ground, you must first contact the local power supply department, see the mark indicating the location of the underground cable, and take reliable measures to prevent accidental damage to the cable, causing casualties, power outages and other accidents.
(18) Do not pile up flammable materials such as coal and other items near electric poles, transformer stations, power distribution rooms, and switch boxes in buildings, and build houses. Doing so poses a threat to the safe operation of the equipment, and also causes difficulties in the overhaul and emergency repair of electrical equipment, affects the fire escape, and causes hidden dangers.
(19) Do not randomly post promotional materials on poles, power distribution rooms, and switch boxes in the building, so as not to cover the operation signs and affect the emergency repair work.
(20) It is strictly forbidden to climb electric poles, transformers, etc., and it is strictly forbidden to open the switch box door in the power distribution room and the building without authorization to avoid accidents.
(21) It is strictly forbidden to hoist (high) vehicles or erect scaffolding near overhead power lines.
(22) When household appliances or wires catch fire, water is not allowed to extinguish the fire without cutting off the power supply to prevent electric shock accidents.
Second, the electrical test of the housing of household appliances
Most household appliances use single-phase power supplies, whether they are equipped with motors, such as electric fans, hair dryers, refrigerators, etc., or with transformers or heating wires, such as televisions, electric irons, and incandescent lamps. When the shell is not grounded, although its insulation is not a problem, the metal shell often has "charged" phenomenon, which can make the electroscope bright but the ordinary voltmeter cannot measure it. At this point, you can use a test pen to carefully check and judge.
(1) The power supply is AC or DC electrical appliances or wires below 500V, and the neon bulb does not glow when the shell or outer skin is tested with a tester under normal power-on conditions. When due to some reasons, such as moisture or insulation aging, damage, the insulation performance is reduced, there is leakage or damage or breakdown, and the wiring is wrong, the neon bulb will light up. Its brightness is proportional to the measured voltage. The higher the voltage, the brighter the neon bulb.
(2) The method of distinguishing live wire and neutral wire: When testing 220/380V three-phase four-wire power line, the tested wire that makes the neon bulb bright is the live wire, and the non-bright wire is the neutral wire.
(3) The method of judging AC and DC: when testing AC, both ends of the neon bulb are illuminated; when testing DC, only one end (the negative terminal) is illuminated.
Plastic meter box manufacturers online: This information is reproduced from the online cooperative media of Safe Electricity Encyclopedia or other websites on the Internet. This article is published for the purpose of conveying more information.