Once I also had this idea, and at that time even very firmly believe that this is the “American Standard for the mainstream” of the biggest reason, however, when I looked up the information, only to understand the root cause of everything. Before the emergence of the new national standard, the domestic socket common socket is “universal type” of the old national standard, is the picture below that look. At that time, the popularity of the old national standard is because with the wave of China's open trade, more and more foreign products into thousands of households, but the country of origin of these imported products has a perfect industrial standards and its subsidiary socket specifications standards, but at that time the hands of the people in the country, either horizontal or vertical inserted into their own sockets, or each product has to be dragged to a self-contained converter seat or transformer, so then Various manufacturers can only be forced to produce sockets into a “perfect” compatibility with various foreign standards of the “universal type”. Use is indeed convenient, but with the electricity consumption of electrical appliances and power gradually increased, followed by the universal type of the old national standard is not a unified standard as well as some manufacturers to cut corners and bring a variety of hidden dangers of electricity. Here we need to introduce a standard term - “insertion and extraction force”, which refers to when the plug is inserted in the socket, pull down when you need to exert how much force, can be simply understood as what we call “firm or not! ”, the old national standard in order to be compatible with a variety of specifications of the plug, so the internal conductor copper was designed as a “cross-size”, both “straight blade can also be inserted, straight column can also be inserted”, but this brings one of the most serious problem But this brings one of the most serious problems, that is, the plugging force will be gradually weakened with the use of time, such as long-term insertion of a straight post two-pronged plug, when pulled down and then inserted into the straight blade two-pronged plug, the plugging force will be due to the long term conductor contact piece by the straight post to support the opening and lead to the bite is not tight to the new plug, and ultimately the false connection of the heat, the light is the damage to the electrical appliances, or the heavy cause of the fire.
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2024-11-11 15:45:45
