What Is WDZN-BYJ Low Somke Halogen Free Cable?

What is wdzn-byj cable?

From the appearance, it is not much different from the ordinary bv line we introduced before. In fact, the difference between the two mainly lies in the insulating layer. The letter meaning of wires is easy to understand. W: Halogen free, d: low smoke, z: flame retardant, n: fire resistant.

Then BYJ corresponds to the naming mode of BV. Both types of wires start with B, and B stands for laying wires. Then we need to understand the meaning of YJ.

YJ: cross linked polyethylene insulation

The crosslinking process is to make polyethylene (PE) material with linear molecular structure form crosslinked polyethylene with network structure through specific processing methods. The long-term allowable working mixed charge is increased from 700 ℃ to 900 ℃, and the allowable short-circuit temperature is increased from 1400 ℃ to 2500 ℃.

2、 Similarities between BYJ and BV

Both are single core wires, most of which are copper cores. This structure also leads to BYJ and bv are hard wires, which are difficult to recover after bending, and the structure is easy to be damaged after repeated bending.

Some places with high requirements will provide wdzn-byj line.

3、 Differences between BYJ and BV

Different materials are used for the insulation layers of the two. By comparison, we will find the following differences:

The temperature resistance grade of BYJ material is 90 ℃.

The temperature resistance grade of BV material is 70 ℃.

The requirements for flame-retardant wires are: normal operation at 750 ℃ ~800 ℃ shall not be less than 90 minutes.

Halogen free means that it does not contain halogen. As we know, "chlorine" in PVC is a halogen, which will produce toxic gas after ignition, increasing fire hazards.

The literal meaning of low smoke is easy to understand.

Fire resistance is divided into grades A, B, C and D, of which grade A has better fire resistance