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1. Clarify project requirements: In which scenarios must mineral insulated cables be used?
Mineral insulated cables are irreplaceable in the following scenarios due to their unique structure and materials (copper sheath + magnesium oxide insulation):
Extreme high temperature environment:
Mineral insulated cables can withstand temperatures of more than 1000°C (short term) or 250°C (long term), and are suitable for high-temperature workshops such as steel smelting and glass manufacturing.
High fire safety level requirements:
Places such as nuclear power plants, chemical plants, and subway tunnels must meet BS 6387 CWZ-level fire resistance standards (950°C flame + spray + continuous power supply for 3 hours under impact).
Explosion-proof and mechanical damage resistance:
In areas prone to explosion or frequent vibration such as oil platforms and mines, the copper sheath of mineral insulated cables can resist physical shock and electromagnetic interference.
2. Compare alternatives: mineral insulated cables vs. ordinary fire-resistant cables
| Characteristic | Mineral insulated cables | Ordinary fire-resistant cable |
| Fire resistance time | ≥3 hours (without external insulation layer) | Usually ≤90 minutes (additional fireproof wrapping is required) |
| Corrosion resistance | Copper sheath is resistant to acid and alkali, but needs to be resistant to oxidation | PVC sheath is easily corroded by chemicals |
| Current carrying capacity | 20% higher than PVC cable at the same cross-sectional area | Conventional design, the cross-sectional area needs to be increased to meet the needs |
| Installation complexity | Professional terminal sealing process is required | Plug and play, ordinary electricians can operate |
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