For the allowable long-term working temperature of wire and cable core, rubber insulation is usually 65 ° C, polyvinyl chloride insulation is 70 ° C, and crosslinked polyethylene insulation is 90 ° C. High allowable temperature of conductor in short circuit (not more than 5s for a long duration) : 160 ° C for PVC insulation and 250 ° C for crosslinked polyethylene insulation.

The difference between XLPE cable and PVC cable:

1. Low-voltage cross-linked (XLPE) cables have developed rapidly since they were put into application in the mid-1990s, and currently account for half of the market share with polyvinyl chloride (PVC) cables. Compared with polyvinyl chloride cables, cross-linked cables have higher current carrying capacity, strong overload capacity and long service life (PVC cable thermal life is generally 20 years when the environment is good, and XLPE cable thermal life is generally 40 years); PVC will decompose and release a lot of black smoke and toxic gases when burning, while XLPE will not produce halogen toxic gases when burning, and the advantages of cross-linked cables are increasingly recognized by the design and use departments.

(2) Ordinary PVC wire and cable (insulation and sheath) combustion delay burning rapidly, fuel the fire, 1 ~ 2min that is, the loss of power supply, the combustion decomposition of the release of black smoke can reach the extent of the fingers, causing breathing and evacuation difficulties. More serious is that PVC combustion decomposition release hydrogen chloride (HCL) and dioxins and other highly toxic corrosive halogen gas, is the main cause of death in the fire (accounting for 80% of the fire death factors), and into a thin hydrochloric acid conductive membrane attached to the electrical equipment, seriously reduce the insulation performance of the equipment, the formation of difficult to remove the secondary disaster.

Two, flame retardant wire and cable

1 flame retardant wire and cable should have flame retardant characteristics, according to the "bunched wire and cable burning test method" GB/T18380.3-2001, can be divided into A, B, C three flame retardant grades, A high flame retardant performance.

The American Institute of Standards and Technology has conducted comparative combustion tests on flame retardant and non-flame retardant wires, and the following test results can illustrate the importance of using flame retardant wires and cables:

a, flame retardant wire than non-flame retardant wire can provide more than 15 times the escape time;

b, flame retardant wire burned material is only 1/2 of the non-flame retardant wire;

c, the heat release rate of flame retardant wire is only 1/4 of that of non-flame retardant wire;

d, the amount of gas produced by combustion is only 1/3 of non-flame retardant products;

e, smoke production performance, flame retardant products and non-flame retardant products are not significantly different.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable. Hotline: 16678668098