BBTRZ Flexible Mineral Insulated Cable

BBTRZ Flexible Mineral Insulated Cable Product Introduction

BBTRZ cable, also known as MI cable, is used in Switzerland and has gradually entered the Chinese market since the 1960s. Due to the inorganic materials used in its production, it boasts superior fire resistance. It is commonly referred to as magnesium oxide cable or refractory cable in China. Currently, it can be categorized into rigid and flexible types based on structural characteristics. It is corrosion-resistant, energy-efficient, environmentally friendly, rodent-proof, ant-proof, and has excellent waterproofing and overload capacity. The BBTRZ cable is widely used for laying power and distribution lines in important locations such as tunnels, cable trenches, bridge supports, conduits, shafts, high-rise buildings, rail transit, shopping malls, exhibition halls, parking garages, and data centers.

Product Name and Applicable Voltage

Flexible Mineral Insulated Fire Resistant Cable

Rated Voltage: 0.6/1 kV

Model and specification range

Model Descriptions & Product Samples

Product Code

2Product Representation Example

For instance:

Mineral insulated flexible refractory cables, rated voltage 0.6/1kV, 4 cores, nominal cross-sectional area 150mm², denoted as BTTRZ 0.6/1kV, 4*150

Mineral insulated flexible refractory cable, rated voltage 0.6/1kV, 1-core, nominal cross-section 300mm², indicated as BTTRZ 0.6/1kV, 1*300

Product Name and Voltage Compatibility

1. Comparison of Applicable Standards and Index Differences

This product complies with our company's enterprise standard Q/HYGK003-2014 "Flexible Mineral Fire Resistant Cable." GB/T12706.1 Part 1: "Cable with Insulation for Power Cables with Rated Voltage from 1kV (Um=1.2kV) to 35kV (Um=40.5kV) and Accessories," GB/T17651 "Determination of Smoke Density of Cables or Optical Fibers under Specific Conditions of Combustion," GB/T18380 "Combustion Test of Cables and Optical Fibers under Present Flame Conditions," and BS6387 "Performance Requirements for Cable Integrity under Flame Conditions."

2. Characteristics and Advantages of Mineral Insulated Flexible Refractory Cables

Fire-resistant characteristics:

Continuous electrical power under 950℃ flame for 180 minutes without puncturing (C)

② Withstands 15 minutes of water spray after being exposed to a flame at 650℃ without piercing (W)

Withstand 15 minutes of impact vibration under 950℃ flame without puncturing (Z)

No intermediate joints

Mineral insulated flexible refractory cables can be custom produced to specified lengths, eliminating the need for intermediate joints, thus reducing joint costs and enhancing cable stability.

Wide Coverage

Mineral insulated flexible refractory cables are available in lengths to suit customer requirements, delivered as a seamless, spool-mounted whole, covering almost all specifications of power cables and control cables.

Short supply lead time

Utilizing advanced production processes and mature manufacturing techniques, we achieve a shorter cable supply cycle, with standard models typically ready for delivery within 7 working days.

Voltage Rating:

The voltage grade of mineral insulated flexible refractory cables can reach up to 0.6/1kV, whereas the highest for standard BTT cables is 750V.

Rodent and Ant Prevention

Mineral insulated flexible refractory cables can be produced continuously without joints and possess rodent and ant-resistant properties.

Softness:

Mineral insulated flexible refractory cables utilize stranded conductors and non-metallic sheaths, making the cables more flexible and lightweight.

Easy to install:

Due to the combination of mineral insulated flexible refractory cable technology with traditional cable production methods, cable installation and laying become more convenient, and it avoids the frequent connection terminal issues encountered with mineral insulated cables (BTTZ).

Low line loss, high cut-off flow

For cables with the same cross-section, mineral insulated flexible fire-resistant cables can transmit higher currents than other types, withstand considerable overloads, and have lower line losses than other cables if the rated current is the same.

Energy-saving and environmental protection: 

The mineral insulated flexible refractory cable cores operate at lower temperatures than other cable types, resulting in lower line losses during operation, reducing energy waste. Moreover, the cable material is non-metallic, meeting environmental protection requirements.

Explosion-proof performance: 

Highly compacted insulating materials in the cables, along with the absence of intermediate joints, prevent steam, gases, and flames from entering the electrical equipment connected to the cables. This makes them suitable for use in explosive hazardous areas and for wiring various explosion-proof equipment and materials.

Radiation protection, high safety: 

Inorganic materials used in mineral insulated flexible refractory cables, which are radiation-resistant, ensure the cables have stability, long lifespan, and durability.

Ultra-flame retardant:

Mineral insulated flexible refractory cables possess ultra-flame retardant properties. The most significant difference in the structure design of general flame retardant cables is the use of inorganic metal hydrates such as aluminum hydroxide and magnesium hydroxide instead of traditional polypropylene rope or glass fiber. Under flame, these metal hydrates convert to metal oxides and water, not only lowering the temperature of the burning cable but also leaving a dense residue that encases the insulated core, preventing it from participating in thermal oxidation reactions. Therefore, even if the installed capacity of such cables exceeds 28L/m, they will self-extinguish instantly (with their carbonization standard reduced from 2.5m to below 1.0m).