[China Aluminum Industry Network] Aluminum alloy cables have emerged in the low pressure area of ​​urban construction. For example, there are a large number of substitutions in business offices, hotel supermarkets, university hospitals, stadiums, and residential buildings, and there is a tendency to infiltrate the urban grid.
Its selling point is 40%-50% cheaper than the same cross-section copper cable. This type of behavior, which is mainly based on the principle of “cheapâ€, has been common in the past. The results are obvious to all. In urban construction, we believe that it is necessary to seriously study the basic requirements of urban construction.
President Xi Jinping said that for urban construction, “it is human life, development cannot be done at the expense of human life. This is an insurmountable red line.†“Why always talk about the bottom line thinking? Is to require full preparation, and there is a need for fear. There is a sense of urgency, and what happens if something happens, then we must guard against it."
It is based on this awareness of the red line that the Office of the State Council's Safety Committee has issued a "Basic Specification for the Construction of a Model City for National Security Development (Consultation Draft)". This involves many neglected principles and norms in urban construction. It is pointed out that safety production is truly a prerequisite and foundation for development and that safety and quality, safety and efficiency, safety and speed are unified, and economic and social development is effectively established in the continuous enhancement of safety and security capabilities, and the safety of workers’ lives and physical health are effectively achieved. On the basis of safeguards, ensure that the people enjoy peace and happiness in the fruits of economic development and social progress. This must be implemented resolutely! It points out the development direction of urban construction and the more basic principle of safety. It is a serious criticism of the utilitarianism that has been filled with the construction of the city in the past.
Let's look at the safety issues that may arise in the replacement of aluminum alloy cables.
First, aluminum alloy cables and aluminum cables have a significantly higher probability of firing than copper cables.
Wang Zhiqiang, a senior engineer at the Ninth Design Institute of China's Shipbuilding Industry Corporation, said at a seminar held by the Development and Research Center of the State Council Development and Research Center that the use of copper cables instead of aluminum cables is a must for high reliability and safety requirements. Due to different thermal expansion coefficients of copper and aluminum metals, aluminum cable joints are prone to fire and the probability of fire is about 10 times that of copper cables. Therefore, the use of aluminum alloy cables should be strictly controlled and used conditionally. Until now, no inspection report or certification document of the national authoritative department has been seen, and it is clear that aluminum alloy cables have completely eliminated the hidden dangers of safe use.
Second, regarding the safety of copper and aluminum cables for fire protection.
The high temperature performance of aluminum alloy cable is obviously weaker than that of copper. The melting temperature of aluminum is 660°C, while the copper can reach 1080°C. The fire resistant cable used in high temperature environment can still maintain power when subjected to 750°C～1000°C. The function. The high temperature resistance properties of copper cables, in the case of fire, constitute a guarantee line for the lives of the general public.
Third, from the perspective of the application side, more attention is paid to the connection and safe and reliable operation of aluminum and aluminum alloy cables applied at different voltage levels, because this is technically economic and socially responsible. So it involves the credibility of the application of this product. According to the current understanding of copper-aluminum cable transition terminals in the country are already authoritative standards can be certified, but the aluminum alloy cable transition terminal has not introduced any product standards, if the product is promoted and applied in the absence of standards is safe and can be Reliability is a great challenge.
In order to expand the application, the application party must solve the connection technology and its spare parts (aluminum-aluminum, copper-aluminum connection spare parts), as well as construction and personnel training issues. Of course, the relevant standards and norms must also be based on full demonstration, through practice, summary, and gradually introduced.
It is worth noting that with regard to the joint problem, careful demonstration must be carried out at every voltage level, including aluminum and aluminum joints, aluminum and copper joints, including standards and specifications, including construction personnel training, etc. These issues are only in practice. Constantly summarizing them in order to be able to form norms, standards, and achieve normal use in the end, this has obvious social responsibilities.
Before the above problems are not recognized by national authorities, there are no relevant standards and specifications, and there is no clear solution, the safety hazards brought about by the replacement of any aluminum alloy cable must be worthy of close attention and attention from relevant departments.
Fourth, simply stressing that low prices are precisely the highlights of security risks.
If we consider the core focus of urban construction on safety, life, and a century-long plan, price costs are not the first option!
Zhang Weiying, a professor at the National Development Institute of Peking University, pointed out that "Utilitarianism leads to the degeneration of society as a whole." The article states that individual utilitarianism means that everyone benefits from advantages and avoids harm, and he or she has to increase his own utility function.
For our city to be even better tomorrow and for the benefit of our children and grandchildren, we must allow a few people to abandon their short-term interests and safeguard the safety of the urban public. Costs and security, life and benefits are all too important. Call the relevant state departments to do their utmost!
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