YTTW 0.6/1kV Flexible Mineral-Insulated Fire-Resistant Cable
YTTW is the flexible variant of mineral-insulated cable: synthetic mica tape insulation gives the 950°C × 90-minute fire survival of rigid BTTZ but in a cable you can pull through conduit and bend like ordinary YJV. The preferred fire-resistant cable in SEA hospital, metro, and high-rise retrofits.
Technical Specifications
| Conductor | Multi-strand copper |
| Insulation | Synthetic mica tape, multi-layer |
| Inner barrier | Copper tape |
| Outer sheath | Halogen-free flame-retardant polyolefin |
| Fire resistance | BS 6387 CWZ (950°C × 90 min + water + impact) |
| Verified per IEC | IEC 60331-21 (830°C × 90 min) |
| Rated voltage | 0.6/1 kV |
| Operating temperature | 90 °C |
| Min bending radius | 15 D |
| Cross-sections available | 1.5 – 240 mm² |
| Core configurations | 1 / 2 / 3 / 4 / 5 cores; 3+1, 4+1 |
Compliance Standards
- ✓GB 23864 (Halogen-free fire-resistant)
- ✓BS 6387 Category CWZ
- ✓IEC 60331-21
Overview
Multi-strand copper conductor, synthetic mica tape insulation (multiple layers), inner copper-tape barrier, halogen-free flame-retardant outer sheath. The synthetic mica retains its dielectric properties through prolonged exposure to 950°C flame; the copper-tape barrier seals against water spray during fire-fighting. BS 6387 CWZ qualified (fire-resistance + water spray + mechanical impact), IEC 60331-21 verified.
Key Features
BS 6387 CWZ — highest rating
Survives 950°C flame + water spray + mechanical impact concurrently — the strictest fire-cable rating in worldwide use.
Flexible like YJV, fire-rated like BTTZ
Bends and pulls like ordinary YJV — no special tooling, no rigid-cable installation training. Same termination methods as standard LV cable.
Applications
Hospital life-safety circuits
Surgical theatre power, ICU emergency lighting, fire pump motors, smoke-extraction fan power.
Tunnel emergency systems
Road and metro tunnel emergency lighting, jet-fan power, evacuation alarm circuits.
High-rise smoke management
Stair pressurization fans, smoke-extraction fans, fire-lift motor power feeds.