BBTRZ is a flexible mineral insulated cable, commonly known as a flexible fire-resistant cable.
BBTRZ is a copper-core, copper-sheathed, magnesium-oxide-insulated, flexible fire-resistant cable. It features a seamless copper tube sheath, insulated with magnesium oxide crystal powder, and a multi-stranded copper conductor. It can withstand a 1000V voltage for three hours at a flame temperature of 950±40°C without breaking down. This second-generation mineral-insulated cable not only shares the fireproof, explosion-proof, heat-resistant, high-current-carrying capacity, and long service life of the first-generation rigid (hard) mineral-insulated cable, but also offers the following advantages: low moisture absorption, more stable insulation performance, multi-core, fixed-length production, eliminating the need for intermediate joints, and a flexible structure that allows for easy bending. It eliminates the need for specialized terminals and accessories, making it suitable for various installation methods and suitable for conventional cable installation by general electrical personnel.
BBTRZ Cable Applications
Mineral-insulated cables are primarily used in harsh, high-temperature environments and for fire warning systems. They are widely used in nuclear power plants, metallurgy, chemical industry, mines, aerospace, high-rise buildings, airports, docks, subways, and other places with high passenger flow. They ensure the proper operation of firefighting equipment such as fire pumps, fire elevators, critical loads, emergency evacuation signs, and fire and smoke exhaust systems in the event of a fire.
BBTRZ Cable Development History
Rigid mineral insulated cables were invented relatively early. Swiss engineer Arnold François Borel proposed the concept of mineral insulated cables in the late 19th century and obtained a patent in 1896. Production began in France and the UK between 1934 and 1936, and they developed rapidly. my country also developed them in the 1960s, initially for military use. Industrial production began in the mid-1980s, and they have gradually been widely adopted in the construction industry. Flexible mineral insulated fire-resistant cables were invented relatively recently, originating in the 1970s at the Swiss company Stud Cable. Our company began researching flexible mineral insulated fire-resistant cables in 2000 and launched China's first and most advanced flexible mineral insulated fire-resistant cables in 2003. Due to shortcomings in reliability, production, and installation, rigid mineral insulated cables have been gradually phased out of the market in developed countries in Europe and the United States. Flexible mineral insulated fire-resistant cables have become the mainstream cable product in the fire protection field.
BBTRZ Cable Features
Compared to traditional rigid mineral insulated cables, flexible mineral insulated cables are constructed of stranded copper wire, mineral compound insulation, and a mineral compound sheath. Their flexible structure, primarily made of inorganic materials, overcomes the drawbacks of rigidity, flammability, and toxicity. They also offer advantages not found in other cables, such as fire resistance, high current carrying capacity, surge voltage resistance, mechanical damage resistance, halogen-free and non-toxic properties, explosion-proof, waterproof, corrosion-resistant, long life, safety, overload resistance, high temperature resistance, and low cost.
BBTRZ Cable Main Functions
General wires and cables use organic polymer materials for insulation, which easily carbonizes under flames, losing their insulating properties. Because flexible mineral insulated fire-resistant cables (BBTRZ) are primarily composed of mineral compounds, they are inherently fire-resistant and cannot burn or support combustion. These materials generally have a high melting point of over 1500℃, so fire-resistant cables can still function normally even under flame conditions, making them truly fire-resistant cables. They can also pass BS6387 C, W, and Z tests.
