The WDZB-BYJ and WDZC-BYJ model numbers differ by only one letter, but they are indeed different cables. The WDZB-BYJ is a copper-core, cross-linked polyethylene insulated, halogen-free, low-smoke, sheathed, flame-retardant Class B power cable. The WDZC-BYJ is a copper-core, cross-linked polyethylene insulated, halogen-free, low-smoke, sheathed, flame-retardant Class C power cable. So what exactly is the difference between them?
What is the difference between the WDZB-BYJ and WDZC-BYJ?
1. Different grades:
A cross-linked polyethylene insulated, polyolefin sheathed, Class A (B, C) flame-retardant power cable. The WDZB-BYJ is a copper-core, cross-linked polyethylene insulated, halogen-free, low-smoke, sheathed, flame-retardant Class B power cable. The WDZC-BYJ is a copper-core, cross-linked polyethylene insulated, halogen-free, low-smoke, sheathed, flame-retardant Class C power cable.
2. Different Applications:
WDZC-BYJ Applications: Suitable for underground installation where flame retardancy, halogen-free, and low-smoke properties are required; not suitable for installation in ducts.
WDZB-YJY Applications: Suitable for installation indoors, in tunnels, and in ducts where flame retardancy, halogen-free, and low-smoke properties are required.
3. Different Performance:
Fire-resistant cables and flame-retardant cables operate under different principles. Halogen-containing cables rely on the flame-retardant effect of halogens, 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 proper operation even in fires.
BYJ conductors are more expensive than BV conductors; BYJ conductors have higher fire resistance than BV conductors; and BYJ conductors are less toxic than BV conductors. Flame-retardant cables are categorized into two types: halogen-containing and halogen-free.
What are the precautions for use?
1. Operating Temperature: The maximum long-term operating temperature of the cable conductor is 90°C. In the event of a short circuit, the maximum temperature of the cable conductor shall not exceed 250°C for a duration not exceeding 5 seconds.
2. Halogen-containing flame-retardant cables (including flame-retardant cables and low-halogen, low-smoke flame-retardant cables) release corrosive halogen acid gases when burned, significantly hindering firefighting efforts, delaying firefighting, and exacerbating the spread of fire. Therefore, halogen-free, low-smoke flame-retardant cables should be used whenever possible in densely populated public spaces. Any type of flame-retardant cable can be used in less densely populated work areas.
3. Flame-retardant cables are classified into three categories: A, B, and C. Category A flame-retardant cables offer superior performance compared to categories B and C, but are also the most expensive. Designers should clearly indicate the category of flame-retardant cables when providing order lists.
4. Category A, B, and C flame-retardant cables cannot be distinguished visually; the manufacturer alone guarantees supply. Therefore, careful consideration should be given to selecting a cable manufacturer during design and selection.
5. Compared to halogen-containing flame-retardant cables, halogen-free, low-smoke, flame-retardant cables offer the advantages of low corrosion and smoke, but their electrical and mechanical properties are significantly reduced. Therefore, when laying cables, halogen-free, low-smoke, flame-retardant cables should have a larger bending radius than halogen-containing flame-retardant cables.
6. When designing cable installations, it is not advisable to lay non-flame-retardant and flame-retardant cables side by side, nor should flame-retardant cables of different flame-retardant categories be laid side by side.
The above describes the differences between WDZB-BYJ and WDZC-BYJ cables. I believe everyone is familiar with the differences and advantages of these two cables. YJV and VV cables are similar in name, but they have different uses, performance, and meanings. WDZB-BYJ is a copper-core, cross-linked polyethylene insulated, halogen-free, low-smoke, sheathed, flame-retardant Class B power cable.
WDZC-BYJ is a copper-core, cross-linked polyethylene insulated, halogen-free, low-smoke, sheathed, flame-retardant Class C power cable. Therefore, if you want to understand different wires and cables in detail, you have to analyze and understand them from different aspects.
