What are the characteristics of BTTZ cables?

BTTZ cables are primarily composed of inorganic materials (copper and magnesium oxide powder), which endow them with excellent conductivity and non-combustibility. The design featuring copper tubing as the outer sheath also allows it to serve as a grounding wire. Of course, these advantages are not the only features of BTTZ mineral insulated cables. There's much more to their magic. Let me introduce to you the other wonders of the BTTZ mineral insulated cables.

Firstly, it is non-combustible and non-flammable. Due to the melting point of copper being 1083 degrees Celsius and the mineral insulation layer above 1000 degrees Celsius, this cable can maintain power supply during a fire near the melting point of copper, making it a true fire-resistant cable. It is tested in compliance with BS6387 C, W, and Z standards.

High load-bearing and waterproof. Due to the actual normal operating temperature of mineral insulated cables reaching up to 250°C, IEC 60702 specifies a continuous working temperature of 105°C for mineral insulated cables, considering the requirements for terminal sealing materials and safety. Nevertheless, the load-bearing capacity of mineral insulated cables is still significantly higher than that of other cables, as mineral insulated cables have better thermal conductivity than plastics. Therefore, under the same working temperature, they have a greater load-bearing capacity. For conductors larger than 16mm², one section can be reduced, and for areas where no one is allowed to touch, two sections can be reduced.

Flame and Corrosion Resistance. Flame Resistance: Mineral insulated cables utilize a metallic sheath as a protective layer, preventing flammable gases, oil vapors, and flames from reaching the electrical equipment connected to the cable, thereby granting the cable explosion-proof properties. Corrosion Resistance: Copper offers superior corrosion resistance, rendering additional protection unnecessary under normal operating conditions. In extreme environmental conditions, such as those with strong copper corrosion, a polyvinyl chloride sheath is applied to the cable to enhance its corrosion resistance.

Resistant to mechanical damage, long-lasting, halogen-free, and non-toxic. Mechanical damage resistance: Due to the cable's metal sheath having certain strength and toughness, the relative positions of the cores and between the cores and the sheath remain unchanged during bending, flattening, and twisting deformation, preventing short circuits. It also does not affect electrical performance. Long lifespan: Since the materials used in the cable are inorganic, they do not age. The service life can be calculated based on the oxidation corrosion rate of the copper sheath. Data shows that with an oxidation thickness of 0.25 mm, it takes 257 years at 250°C. The mineral insulated cable sheath thickness is generally between 0.34-1.05 mm, with operating temperatures below 250°C, offering a long service life. Halogen-free and non-toxic: As all cables are composed of inorganic materials (copper and mineral insulation), even when burned at 1000°C, they do not produce smoke, halogens, or toxic gases. They are truly halogen-free and non-toxic cables.

Grounding conductors can be made of overload resistors and copper sheaths. Overload Resistors: Due to copper's melting point of 1083°C and mineral insulation exceeding 1000°C, mineral insulated cables can increase their load-bearing capacity by one grade compared to standard plastic cables and can withstand considerable overload. The overload capacity of mineral insulated cables can reach up to 10 times their normal load-bearing capacity. Copper sheaths can be used as grounding conductors: Due to their continuity and extremely low grounding resistance, the copper sheath of mineral insulated cables can serve as a grounding conductor without the need for a separate grounding wire.