750V Mineral Insulated Cables

750V Mineral Insulated Cables can operate stably in continuous high-temperature environments up to 250℃, making it suitable for long-term high-temperature operations. Under extreme high-temperature conditions, such as fire scenarios with temperatures between 950℃ and 1000℃, the cable can maintain its integrity and provide continuous power for at least 3 hours, providing valuable power support for emergency lighting, fire-fighting equipment, and critical control systems.

In short-term or special emergency situations, its temperature resistance can approach the melting point of copper conductors (1083℃), while the inorganic insulation material it uses has a melting point as high as 2800℃, far exceeding the temperature of conventional fires. This ensures that the cable maintains structural integrity and normal function throughout the initial and spread stages of a fire.

Application scope:

750V Mineral Insulated Cables are suitable for use in densely populated areas, including main and branch power distribution systems, general lighting, internal wiring of machinery and equipment, intrinsically safe circuits, emergency lighting, emergency backup power supplies, information and data transmission and control lines for fire-fighting equipment, and potentially explosive hazardous areas.

Main application places

1) Public Buildings: Public entertainment venues; high-rise buildings; hotels and restaurants; hospitals, schools, government offices; national memorial halls and historical buildings; libraries, museums, and exhibition halls; airport terminals, train stations, and ports; power dispatching buildings and telecommunications buildings.

2) High-Temperature Environments: Metallurgical industry; coking industry; shipbuilding industry; steel industry; glass industry; power transmission and distribution lines in other high-temperature environments. 3) Explosion-proof systems and fire hazard areas: Petrochemical industry; oil refineries, gas stations and oil depots; paint and pigment industry; chemical industry; nuclear power plants; offshore oil platforms; natural gas and coal gas transmission and compression stations; pharmaceutical industry; mining; military industry

4) Underground locations: Subways; underground warehouses; tunnels; underground plazas

5) Transportation and traffic hubs

6) Timber structures

Product Structure

Mineral insulated cables is composed of a copper conductor, magnesium oxide powder mineral insulation and copper sheath. When cables are used in factories where copper is corrosive, an outermost layer of polyvinyl chloride (PVC) can be added. In buildings or underground locations where aesthetics or easy accessibility are important for the cable, a halogen-free, low-smoke outer sheath can be added.

Conductor: Solid Copper , Class 1 to IEC 60228.

Insulation: It is composed of compacted magnesium oxide mineral powder, and its electrical properties meet the requirements of GB/T 13033.1/IEC 60702-1.

Metallic sheath: Annealed copper sheath, conforming to GB/T 13033.1/IEC 60702-1.

Non-metallic sheath: Made of polyvinyl chloride or halogen-free low-smoke polyolefin.

Performance parameter

This cable has a rated voltage of 750V. In terms of electrical performance, its insulation can withstand a 2.5kV test voltage for 1 minute without breakdown; the maximum permissible operating temperature is 250℃. Mechanically, the minimum bending radius during cable installation is 24 times the cable's outer diameter. Its fire resistance strictly complies with IEC 60331-1 standards, capable of remaining intact after 180 minutes of continuous combustion in a flame.

Furthermore, the outer diameter and ellipticity of the copper sheath of the cable meet the requirements of GB/T 13033.1 and IEC 60702-1 standards, with specific tolerances detailed in the relevant tables. The DC resistance of the conductor at 20°C meets the requirements for the first type of conductor in GB/T 3956, and the resistance of the copper sheath also meets the corresponding standard. Regarding insulation resistance, the insulation resistance between conductors and between the conductor and the copper sheath is not less than 1000 MΩ per kilometer, ensuring reliable insulation performance during long-term operation.

Comparison of fire resistance tests between mineral-insulated cables and ordinary cables:

Mineral-insulated cables showed virtually no change after the fire resistance test. Organic-insulated cables exhibited obvious carbonization.

Typical characteristics of mineral-insulated cables:

Service life up to 100 years;

● Non-combustible, does not support combustion, releases no toxic gases, and has zero combustion energy;

● Continuous operating temperature up to 250℃, short-term operating temperature up to 1083℃;

● Excellent fire resistance; the cable can be reused after a fire;

● Cable terminals and intermediate connectors are provided with the cable, enhancing its fire resistance reliability;

● The cable can withstand extremely high temperatures, impacts from falling objects, and fire sprinkler systems during a fire;

● The cable can be used in high-temperature environments;

● Waterproof, moisture-proof, oil-proof, and corrosion-resistant; no aging, extremely stable cable performance;

● The cable's metal sheath can be used as a grounding circuit;

● Excellent mechanical strength and bending performance, suitable for complex structures and confined spaces;

● High current carrying capacity due to the cable's unique structure;

● Small cable outer diameter, easy installation, low overall cost, no need for conduit protection;

● Good explosion-proof performance and excellent resistance to nuclear radiation;

● Excellent electromagnetic shielding and electromagnetic compatibility performance;

● Protective against animal bites.

Application scenarios:

Packaging & Delivery

Packaging Details:

It is determined by the quantity and requirements you purchase. Can be negotiated.

Port: Tianjin Port

Delivery: By Sea, By Air, By express.