Mineral Insulated Thermocouple Cable
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Mineral Insulated (MI) cables are high-performance cables designed for extreme environmental conditions. They consist of metal conductors embedded in compressed mineral insulation material (usually magnesium oxide, MgO) and are encased in a metal sheath. MI cables are used in applications requiring high-temperature resistance, fireproofing, or corrosion resistance.
MI cable structure
- Metal Conductors: Copper, stainless steel, Inconel, or other alloys
- Insulation: Magnesium oxide (MgO) is the most common insulating material
- Metal Sheath: Provides mechanical protection and shields the internal conductors
Standards and certifications
MI cables meet the following international standards:
- IEC 60702
- BS 6387
- NEC
Specifications
Low-Voltage MI Cable（0.6/1kV）
| Core | Cross-Section Area (mm²) | Outer Diameter Range (mm) | Weight (kg/km) |
| Single-Core | 10-500 | 15-60 | 500-4000 |
| Multi-Core | 1.5-240 | 10-50 | 200-3500 |
Medium-Voltage MI Cable（6~35kV）
| Core | Cross-Section Area (mm²) | Outer Diameter Range (mm) | Weight (kg/km) |
| Single-Core | 50-1000 | 30-100 | 2000-8000 |
| Multi-Core | 35-500 | 40-120 | 2500-9000 |
High-Voltage MI Cable（≥110kV）
| Core | Cross-Section Area (mm²) | Outer Diameter Range (mm) | Weight (kg/km) |
| Single-Core | 200-2000 | 50-150 | 5000-15000 |
Performance Parameters
Electrical Performance
| Parameter | Low-Voltage Cable (0.6/1kV) | Medium-Voltage Cable (6~35kV) | High-Voltage Cable (110kV Min) |
| Rated Voltage (U₀/U) | 0.6/1 kV | 6/10-26/35 kV | ≥110 kV |
| Insulation Resistance (MΩ·km) | ≥100 | ≥200 | ≥500 |
| AC Voltage Withstand (kV) | 3.5 | 21~52 | ≥160 |
| DC Resistance of Conductor (Ω/km) | Compliance to IEC standards | Compliance to IEC standards | Compliance to IEC standards |
Mechanical Performance
| Performance Indicator | Steel Tape Armored | Steel Wire Armored | Aluminum Tape/Stainless Steel Armored |
| Tensile Strength (N/mm²) | 300-500 | 400-600 | 150-250 |
| Compression Performance (N) | ≥3000 | ≥1500 | ≥1000 |
| Minimum Bend Radius | 6×Cable Outer Diameter | 10×Cable Outer Diameter | 8×Cable Outer Diameter |
Thermal Performance
| Working Temperature Range (°C) | -40 to 90（Standard Insulation） |
| Short-Circuit Temperature (5s) (°C) | 160~250（depending on material） |
| Flame Retardant Performance | Compliace to IEC 60332 Standard |
Features
- High temperature resistance: Can withstand temperatures up to 1,000°C (1,832°F) or higher, depending on the materials used
- Fire resistance: MI cables maintain functionality during and after exposure to fire, making them ideal for critical systems such as emergency circuits
- Corrosion resistance: When using appropriate sheath materials, MI cables perform well in corrosive environments, including marine and chemical industries
- Mechanical strength: Resistant to crushing, bending, and other physical stresses
- Longevity: Due to the stability of the materials used, MI cables do not age and are highly durable
- Moisture resistance: Compressed MgO has strong resistance to moisture infiltration
Applications
- Industrial processes: High-temperature equipment, furnaces, or kilns
- Fire safety: Emergency systems (e.g., fire alarms, smoke exhaust systems, exit lighting)
- Oil and gas: Pipeline monitoring and wellhead heating
- Marine and offshore: Corrosion-resistant installations on ships or oil drilling platforms
- Nuclear facilities: Radiation-resistant wiring for critical systems
- Building infrastructure: Fire-resistant cables for modern skyscrapers and tunnels
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