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Difference between BLX cable and overhead insulated cable
Apr 02, 2018

At present, more and more domestic aerial cable consumption, all enterprises in the production and development of the market needs of a variety of overhead cables, in the day-to-day sales of production, there are still customers, to order BLX cable to replace the use of overhead insulation.


According to the market survey, the domestic mainstream wire and cable production enterprises have no longer produce BLX cable, so the author of the difference between the two cables put forward a little humble opinion: 1, the current domestic production of low-voltage aerial cable enterprises, the national standard gb∕t 12527-2008 "rated voltage 1kV and the following aerial insulated cable" as the basis.


This standard is the latest edition of the updated version of the 2008 revision of national standards. Overhead insulated cables are mainly used for overhead fixed laying, door line and other places, its insulation materials using weather-resistant special aerial insulation cable material, so overhead insulated cable has a simple structure, safety and reliability, mechanical and physical properties and electrical performance, resistance to environmental resistance, such as the advantages of the insulation using weather-resistant special aerial insulation cable materials,


Long-term allowable operating temperature of cable up to 70 ℃ or 90 ℃, and the electrical insulation performance is excellent, the volume resistivity reaches 1.0x1012ω m above; in laying, the use of overhead insulated cable can reduce the laying gap, save the line corridor, reduce the voltage drop, in use, can reduce the occurrence of power supply accidents, to ensure personal safety.


2, the current domestic enterprises to produce BLX-type cable, mainly based on jb/t1601-1993 "rated voltage 300/500v rubber insulation fixed laying wire", the standard for 1993 issued, has not yet been updated for nearly 20 years, the product in the market has been gradually replaced by aerial cable. BLX type rubber insulated fixed laying wire is applicable to the AC rated voltage uo/u as 300/500v and the following electrical equipment and lighting system, the long-term allowable operating temperature of the wire is 65 ℃. The structure of the aluminum conductor, extrusion rubber insulation, woven outside the wire and then coated asphalt materials, coated asphalt material is anti-ultraviolet.


This cable in the use of two years ago, often due to wind scraping the sun and lead to woven glass peeling, breakage, resulting in a short life, anti-aging performance, while polluting the environment. With the continuous updating of national standard of cable products, according to the National Electricity safety and reliable requirements, BLX-type cloth wire performance than aerial cable, so the market on the aerial insulated cable has gradually begun to replace the BLX-type cable.


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