1. What is WDZN-YJV cable?
Flame-retardant cables prevent and slow the spread of fire in the event of a fire. Flame-retardant wires and cables are typically made by adding halogen compounds and metal oxides to the sheathing material. While this is an excellent flame-retardant method, the halides in these materials release large amounts of smoke and hydrogen halide gas during combustion. This reduces visibility during a fire, significantly hindering safe evacuation and firefighting efforts, and often leads to suffocation and death from the toxic gases. Furthermore, hydrogen halide gas reacts with water in the air to form "hydrogen halide acid," which severely corrodes equipment and buildings, causing secondary damage. Currently, with the continuous advancement of technology, flame retardancy has evolved from halogen-based flame retardancy to low-halogen and halogen-free flame retardancy.
WDZN-YJV Cable Specifications: Single-core: 10-630 mm²; Multi-core: 1.5-300 mm²
WDZN-YJV Cable Features:
1. In the event of a fire, the cable line will operate normally for a limited period of time, increasing escape opportunities.
2. The raw materials do not contain halogens (F, Cl, Br, I, AT), lead, cadmium, chromium, or mercury, among other environmental substances.
3. The cable slows down combustion and automatically extinguishes upon removal from the flame.
4. Suitable for use in densely populated areas such as hospitals, shopping malls, airports, and subways.
5. The conductor's permissible long-term operating temperature is 900°C.
6. The conductor's permissible short-circuit temperature is 2500°C (maximum duration not exceeding 5 seconds).
II. Meaning of WDZN-YJV Cable Codes
WD: Halogen-free, low-smoke
Z: Flame-retardant (Flame-retardant ZR)
N: Fire-resistant (NH)
YJ: Cross-linked polyethylene insulation
V: Polyvinyl chloride sheath
III. Differences between WDZ and WDZN Cables (Differences between Flame-retardant and Fire-resistant Cables)
1. The main difference between WDZ and WDZN cables is that the conductor of WDZN fire-resistant cables is wrapped with a layer of mica tape, which allows the cable to maintain normal power flow for a period of time even in the event of a fire.
2. The main feature of WDZ flame-retardant cables is that they are not easily ignited, or if they do, the flame spread is limited to a certain area. They are suitable for use in power plants, subways, tunnels, high-rise buildings, large industrial and mining enterprises, oil fields, coal mines, and other locations with dense cable installations.
3. The main feature of WDZN fire-resistant cables is that, in addition to transmitting power under normal operating conditions, they can also maintain normal operation for a period of time in the event of a fire. They are suitable for use in nuclear power plants, subways, tunnels, high-rise buildings, and other locations where fire safety and firefighting are crucial.
4. The working principles of fire-resistant and flame-retardant cables differ: Halogen-containing cables rely on the flame-retardant effect of the halogen, while halogen-free cables rely on the release of water to lower the temperature and extinguish the flame. Fire-resistant cables rely on the fire-resistant and heat-resistant properties of the mica material in the refractory layer, ensuring the cable operates properly even in a fire.
5. WDZ cables are priced slightly lower than WDZN cables by 10-20%. This depends on the process and cost of each cable manufacturer, so the final price quoted by the cable manufacturer is the correct price.
