gui chao cable news: blx cable and overhead insulated cable
from：guichao author：admin click： 301 addtime：2017-03-12 10:15:54
at present, there are more and more overhead cables in china, all kinds of overhead cables are needed by the enterprises,
in the daily sales of production, there are still customers, to order blx cable, replace the use of overhead insulation.
according to the market survey, the domestic mainstream wire and cable manufacturers are no longer producing blx cable,
the difference of the two kinds of cable of a humble opinion:
1, the current domestic production of low overhead cable companies, are based on the national standard gb / t 12527-2008 "rated voltage 1kv and below" on the basis of overhead insulated cable.
this standard is revised in 2008 to update the latest version of the national standard.
overhead insulated cables are mainly used in the field of fixed overhead laying and wire drawing, and the insulation material is made of weather resistant special overhead insulated cable material,
therefore, the overhead insulated cable has the advantages of simple structure, safety and reliability, excellent mechanical and electrical properties, and environmental resistance to ultraviolet radiation,
due to the adoption of weather resistant special aerial insulated cable material, the long-term working temperature of the cable is as high as 70 deg c or 90 deg c, and the electric insulation performance is excellent,
the volume resistivity is up to 1 * 1012 * m; in the laying, the overhead insulated cable can be used to reduce the laying gap, save the circuit corridor and reduce the voltage drop;
in use, can reduce power supply accidents, to ensure personal safety.
2, the current domestic production of blx type cable, mainly based on jb/t1601-1993 rated voltage 300/500v rubber insulation fixed laying wires,
this standard is formulated to release 1993, has not yet been updated for nearly 20 years, the product has been gradually replaced by the overhead cables in the market.
blx type rubber insulated fixed wire is suitable for electrical equipment and lighting system with ac rated voltage of 300/500v and below uo/u,
the long-term permissible operating temperature of the wire is 65 deg c. the structure of the utility model is an aluminum conductor, an extruded rubber insulation, an external braided wire, and then a grease asphalt material,
the effect of coated asphalt material is anti uv. in the past two years, the cable is often caused by the wind and the sun will lead to the loss of woven glass fiber,
the utility model has the advantages of short service life, poor aging resistance and environmental pollution.
with the continuous improvement of the national standard of cable products, according to the requirements of safe and reliable use of the state power, the blx type wire is not as good as the aerial cable,
therefore, the market has gradually begun to replace the insulated cable blx cable.