It's common to see changes in wire and cable models when the main construction project is completed and ready for delivery. This is often due to construction delays or high costs. Before selecting a mineral insulated cable, it's important to understand the differences between BTTZ and YTTW cables.
1. The cable production processes differ. While both cables pass the BS6387 fire test and can withstand a 250°C fire for over three hours, their structures and fireproofing materials differ. BTTZ utilizes a magnesium oxide powder-filled drawing process, while YTTW utilizes a mica tape-wrapped, seamlessly welded process. These are essentially new models developed based on the BTTZ. Generally, there's no such model abroad. These latter mineral insulated cable models were developed based on domestic demand and have survived market scrutiny. Therefore, if you're looking for authentic foreign mineral insulated cable, choose the BTTZ model.
2. Cable construction costs vary. Many construction projects require cost reductions in the later stages, so the slightly cheaper YTTW cable can be used. The higher cost of BTTZ cable compared to YTTW is due to the different production processes and equipment. A single BTTZ cable production line can cost tens of millions, while a YTTW cable production line only costs two to three million.
3. Cable installation differs. Many construction projects have already selected a cable model, only to find that installation is difficult after the first batch of cables arrives, forcing them to change the model. This results in significant cost and waste. Mineral insulated cables are generally custom-made, so even if the cable manufacturer recycles them, they still have to offer a significant discount, making the cost more than the cost. YTTW cable installation is slightly less complex than BTTZ cable. For details on the terminal connection methods for both mineral cables, please see our terminal installation video.
4. Cable production specifications and lengths vary. BTTZ cables do not have 5-core cables. They are usually 4-core cables with a copper tube sheath and grounding. If 5-core cables are required, they are 4+1 or 3+2. Moreover, BTTZ cables over 25 square meters are all single-core and have a maximum length limit. YTTW cables are 5-core cables with no length limit.
