You may know a thing or two about household wiring, but how much do you know about industrial cables and those used in large facilities? There's a type of cable called BTTRZ cable. BTTRZ cable is a type of mineral insulated cable with a flexible, fire-resistant structure. There's also BTTZ cable, which uses a similar manufacturing process, but features a degree of flexibility and flame retardancy, making it easier to transport, more flexible, and safer to use. So, what exactly is BTTRZ cable? What are its characteristics? Let's take a closer look.
BTTRZ cable stands for Flexible Copper Sheathed Inorganic Mineral Insulated Fire-Resistant Cable.
1. Rated voltage: 0.6/1kV.
2. Rated operating voltage: 500V for light load, 750V for heavy load.
3. Rated current: 25A-1800A for single-core cables, 16A-500A for multi-core cables.
4. Insulation resistance: >1000MΩ·km. For cable lengths less than 100m, the insulation resistance must be >10,000MΩ.
BTTRZ Cable
BTTRZ Cable
BTTRZ Mineral Insulated Cable Features
1. Excellent fire resistance. The fire resistance rating not only meets the national standard GB12666.6 Class A (950°C, 90min), but also meets the British BS6387-1994 requirements for Class A (650°C, 3h), Class B (750°C, 3h), and Class C (950°C, 3h). Furthermore, the cable can withstand water spray and mechanical impact during combustion.
2. Long continuous lengths. Whether single-core or multi-core, the cable's length meets the power supply requirements, with each cable exceeding 1,000m.
3. Large cross-section. The cross-section of single-core cables can reach up to 630mm², and that of multi-core cables can reach up to 70mm².
4. Flexible. The cable can be coiled on a reel with a bending radius of 6-10D.
5. Smokeless and non-toxic during combustion. The insulation is made of inorganic materials, producing no harmful gases or secondary pollution, making it a truly environmentally friendly green product.
6. High overload capacity. The cable not only has a high current carrying capacity but also a high overload capacity. According to wiring instructions, the cable surface temperature is generally ≤70°C. If the wiring is not touchable and does not come into contact with combustible building materials, the cable sheath temperature can be increased to 105°C. Fire-resistant cables can operate at temperatures up to 250°C under overload conditions.
7. Corrosion resistance and excellent shielding performance. The copper sheath has excellent corrosion resistance. In special or copper-corrosive environments, a low-smoke, halogen-free or plastic outer sheath should be added. The copper sheath's shielding eliminates electromagnetic interference and does not interfere with the information transmitted by signal and control cables.
8. High safety. Fire-resistant cables can operate normally in flames (950°C for more than three hours), triggering fire extinguishing devices and minimizing fire losses. The copper sheath is an excellent conductor and the best grounding wire, significantly improving the sensitivity and reliability of grounding protection.
9. It has a long service life, is heat-resistant, and is not prone to aging. Under normal operating conditions, its service life is over 100 years.
10. It is economical. Due to its advanced manufacturing process and simple installation, flexible fire-resistant cables have a lower overall cost than mineral-insulated cables under the same conditions.
Wires and cables typically come in different specifications and models. Within each model category, there are also subcategories based on materials and elements. For example, BTTZ cable is not flame-retardant, while BTTRZ is a flame-retardant copper-core wiring cable. However, both cables have the characteristics of high-temperature resistance, high current carrying capacity, and long service life. Therefore, to fully understand different wires and cables, it is necessary to analyze and understand them from different perspectives.
