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Technical Committee on Standardization of Building electrical installations in conjunction with the International Copper Industry Association will be the IEC 60364-5-523 standards related to copper core cable load flow standards first written to provide design, production, construction and installation, quality inspection, operation and management and other reference. The International Electrotechnical Commission (IEC), which began its revision of the 1983 version of the volume standard in 95, has entered its final approval phase. After a detailed comparison of the two, the following circumstances and changes to inform the reader:
1. The applicable voltage range is changed to AC 1KV and DC 1.5KV.
2. Removed the copper core 1.0mm2 and aluminum core 1.0mm2, 1.5mm2 cable load flow.
3. The load flow basically unchanged, the individual change does not exceed 7%.
4. The variety and temperature ceiling value of cable wires have not changed.
5. The modified coefficient is increased when the soil thermal resistance rate is not 2.5k.m/w.
6. The way in which the cable is laid in the table is changed to the figure.
7. Table 52-e4, E5 to cancel the load flow data of the tray without holes.
8. The following modifications have been made to article 523.5:
(1). Only three-phase conductor with load current and balance, 4-core, 5-core cable can have larger load flow;
(2). When the three-phase load is unbalanced, the temperature rise caused by the neutral line current will be offset by the heating of the line current decreasing. In this case, the conductor section should be selected according to the maximum phase line current;
(3). When the neutral line has a load current and the phase line current does not decrease correspondingly, when the neutral wire harmonic current is more than 10%, the neutral line section should not be less than the Phase line section. A larger harmonic current correction factor is shown in Appendix C.
9. Increase the parallel conductor to achieve load current distribution balance of some requirements.
International Copper Industry Association (China)
National Standardization Technical Committee for Building Electrical Installations
The December 1998 International Copper Association is the world's most important non-profit promotion and promotion of copper use of international organizations. There are 29 official members, representing 80% of the world's copper production, and its collaborating members are the world's largest copper and copper alloy processing enterprises. The International Copper Association is responsible for the formulation of policy, long-term planning and allocation of funds, so as to promote the use of copper projects worldwide. In addition to its headquarters in New York, the International Copper Association has regional offices in London, Santiago, Beijing, Singapore, Mumbai and Shanghai. The International Copper Association project is specifically implemented through the Regional Representative office and 21 independent copper development centers and some manufacturers. The project focuses on the main copper end-use: wire and cable for electricity and information transmission, piping systems for water supply, products for design and decoration inside and outside the building, industrial applications and automotive applications. The International Copper Industry Association supports scientific research on the effects of copper on the environment and human health. The International Copper Industry Association provides relevant basis and recommendations for the formulation of policies and regulations on copper and copper alloys to national government departments. The International Copper Industry Association has representative offices in Beijing and Shanghai. In the electric energy efficiency, the construction conductor, the copper water pipe application, the new automobile radiator and so on has carried on the massive work, and has obtained the related department the support and the participation. The Beijing representative office of the International Copper Industry Association is willing to work with people from all walks of life to better contribute to the copper industry and social development.