Many overseas electrical contractors and project purchasers often feel confused when selecting mineral insulated fireproof cables. BTTZ, YTTW and BBTRZ are widely used fire-resistant cables on the market. Improper model selection may bring hidden safety risks and unnecessary project costs. This article clearly sorts out their structural features, performance gaps, applicable scenarios and procurement tips.
1. Basic Structure Introduction
1.1 BTTZ Cable
BTTZ is rigid mineral insulated cable. It adopts seamless copper tube sheath, magnesium oxide inorganic insulation and solid copper conductor. The whole cable is rigid and cannot be bent casually.
1.2 YTTW Cable
YTTW is flexible mineral insulated fireproof cable. It uses multi-strand copper conductors, wrapped inorganic fire-resistant material and corrugated copper sheath. It retains excellent fire resistance while realizing flexible bending performance.
1.3 BBTRZ Cable
BBTRZ is flexible inorganic fireproof cable without metal sheath. It uses multi-strand copper core, inorganic fire insulation and outer polymer sheath. It is lighter and has lower comprehensive cost.
2. Core Performance Comparison
| Item | BTTZ | YTTW | BBTRZ |
|---|---|---|---|
| Bending Performance | Rigid, difficult bending | Good flexibility | Flexible |
| Fire Resistance Grade | Highest | Excellent | Good |
| Waterproof & Corrosion Resistance | Excellent | Good | Ordinary |
| Outer Sheath | Solid copper pipe | Corrugated copper tube | Polymer sheath |
| Construction Difficulty | High, need pre-layout | Medium, adapt complex pipelines | Low, easy laying |
| Unit Cost | Highest | Medium | Lowest |
3. Suitable Application Scenarios
BTTZ Cable
Ideal for high-standard key projects: urban tunnels, underground comprehensive pipe corridors, super high-rise building main power supply lines, nuclear supporting projects and places with extremely strict fire protection requirements.
YTTW Cable
Suitable for projects requiring bending construction: commercial complex fire control loops, underground parking lots, equipment room wiring, pipe trenches with many turning points.
BBTRZ Cable
Mainly used in conventional civil buildings, residential communities, ordinary office buildings, general fire alarm circuits and conventional power distribution lines.
4. Key Purchasing Tips for Overseas Buyers
Confirm local fire protection acceptance standards before ordering. Some regions have clear requirements for metal sheath fireproof cables.
Reserve sufficient construction space if you choose BTTZ rigid cable, because it cannot bend at will.
When the project pipeline has many corners, prefer YTTW flexible fireproof cable to avoid construction obstacles.
Ask suppliers to provide complete IEC, CE test reports to meet customs and project inspection requirements.