Copper Core Wire And Cable Ampacity Standard

This standard is translated from the section 523 of Part V of building Electrical installations, standard number IEC 60364-5-523 1983. After the reform and opening up, public utilities and residential construction developed rapidly, and household electrical equipment and other electrical equipment increased gradually. But it can not be ignored that in the annual fire, electrical fire is also on the rise. In just a few years, the proportion of electrical fire has more than doubled, a considerable part of which is caused by the insulation damage of cable and wire, overheating and spontaneous combustion, poor contact, cable single-phase ground and interphase short circuit and other faults. Therefore, how to scientifically and reasonably use cable and wire, accurately select the flow of cable and wire, in line with the standard management and maintenance, is the key. Because there is no national standard for cable wire carrying capacity below 1000V, and the use of cable and wire, in view of this, the national technical committee for the standardization of building electrical equipment, has put forward the standard plan, reported to the State Technical Supervision Bureau, the international Electrotechnical Commission IEC 60364-5-523 standard equivalent for the national standard (China cable wire meet the IEC cable wire manufacturing standard).

The Standardization Technical Committee of Building Electrical Equipment, together with the International Copper Association, will first write the IEC 60364-5-523 standard of copper-core cable and wire flow, providing reference for design, production, construction and installation, quality inspection, operation and management. The International Electrotechnical Commission has begun revising the 1983 edition in 1995 and is now in the final approval phase. After a detailed comparison of the two, the readers are informed of the following information and changes:

1. The applicable voltage range is changed to ac 1KV and DC 1.5KV.

2. Delete the cable and wire flow rate of copper core 1.0mm2 and aluminum core 1.0mm2, 1.5mm2.

3. The load flow is basically unchanged, and the individual change does not exceed 7%.

4. The variety and temperature rise limit value of cable and wire have not changed.

5. The soil thermal resistance rate is not 2.5K. The correction coefficient at m / W.

6. The original text description of the cable and wire laying method in the table is changed to a schematic diagram.

7. Cancel the load data in Table 52-E4 and E5.

8. Article 523.5:

(1). When only the three-phase conductor has load current and balance, 4 core and 5 core cables can have a large carrying rate;

(2). When the three-phase load is not balanced, the temperature rise caused by the neutral line current will be offset by the heating decrease by the line current. In this case, the conductor cross-section shall be selected according to the maximum phase line current;

(3). When there is a load current in the neutral line, but the phase line current is not reduced accordingly, when the harmonic current of the neutral line is greater than 10%, the neutral line section should not be less than the phase line section. Large harmonic current correction coefficients are shown in Appendix C.

9. Add the parallel conductor to meet some requirements of the load current distribution balance.

The International Copper Industry Association (China)

The National Technical Committee on Standardization of Electrical Equipment in Buildings

In December 1998, the International Copper Industry Association is the world's most important non-profit international organization to promote and promote the use of copper. It now has 29 full members, representing 80% of the world's refined copper production, and its cooperative members are all the world's largest copper and copper alloy processing enterprises. The International Copper Association is responsible for formulating policies, long-term planning and fund allocation plans to facilitate the development of copper use projects worldwide. In addition to its headquarters in New York, the International Copper Association has regional representative offices in London, San Diego, Beijing, Singapore, Mumbai and Shanghai. The CCPIT project is implemented through regional representative offices, 21 independent copper development centers and a number of manufacturers.The project focuses on the final use of major copper: wires and cables for power and information transmission, piping systems for water supply, products for interior and exterior design and decoration, as well as industrial and automotive applications. The International Copper Industry Association supports scientific research on the impact of copper on the environment and human health. The International Copper Association provides national government departments with the basis and recommendations for the formulation of policies and regulations on copper and copper alloys. The International Copper Association has representative offices in Beijing and Shanghai. A lot of work in electric energy efficiency, the application of building wire, copper water pipe, new automobile radiator and other aspects, and has obtained the support and participation of relevant departments. The Beijing Representative Office of the International Copper Association is willing to cooperate with people from all walks of life to make better contributions to the development of the copper industry and the whole society.