Mineral-Insulated Fire-Resistant Cable (BTTZ)
Fire-resistant cable with magnesium oxide insulation.
Product Overview
BTTZ mineral-insulated cables feature copper conductors surrounded by compacted magnesium oxide (MgO) insulation within a copper sheath. They provide exceptional fire resistance, maintaining circuit integrity even at temperatures exceeding 1000 °C.
Key Features
- Copper conductors with MgO mineral insulation
- Copper outer sheath for mechanical protection
- Fire resistance up to 1000 °C+
- Maintains circuit integrity during fire
- Long service life, no aging of insulation
Technical Specifications
Typical ratings for mineral-insulated fire-resistant cables to IEC 60702.
| Rated Voltage (U0/U) | 450/750 V, 0.6/1 kV |
|---|---|
| Conductor | Solid copper |
| Insulation | Compacted Magnesium Oxide (MgO) |
| Sheath | Copper (seamless drawn) |
| Fire Resistance | 950 °C for 180 minutes (IEC 60331) |
| Max. Operating Temp. | 105 °C (continuous), 250 °C (emergency) |
| Min. Bending Radius | 6 × overall diameter |
| Standards | IEC 60702, EN 50525, GB/T 13033, CE |
Typical Applications
Fire alarm and emergency lighting systemsCritical safety circuits in buildingsTunnel and underground installationsNuclear and hazardous areas
Standards & Compliance
Manufactured and tested to the following international standards.
IEC 60702Mineral-insulated cables
EN 50525Fire-resistant cables
GB/T 13033China MI cables
CEEU declaration
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