Mineral insulated Fire resistance cable
YTTW cable is designed for aboveground applications.
Engineered to replace conduit and wire applications, this all-in-one cable assembly offers fewer installation steps.
The copper metallic sheath protects the conductors from damage before,during and after installation and provides overall flexibility not available with a conduit.
Rated working voltage:
– Light Duty: 500 V
– Testing Voltage (50 Hz): 2500 V - 15 min
– Heavy Duty: 750 V
– Testing Voltage (50 Hz): 2000 V - 15 min
| — Flame Retardant — High Operating Temperatures — LSOH Halogen-free — Great Mechanical Strength — Competitive Installed Cost — Public Places |
Our YTTW cables provide outstanding electrical and fire-proof properties, and are halogen free.
|
| National | International | |
| Construction | GB/T 12706 | IEC 60502 |
| Non fire-propagating | GB/T 18380.3 | IEC 60332-3 |
| Low opacity of smoke emitted | GB/T 17651.2 | IEC 61034-2 |
| Fire-resistant | GB/T 12666.6 | IEC 60331 |
| Low acidity and corrosiveness of gases | GB/T 17650.2 | IEC 60754-2 |
| Halogen free | GB/T 17650.2 | IEC 60754-1 |
| Non flame-propagating | GB/T 18380.1 | IEC 60332-1-2 |
|
Conductor | Stranded copper conductor class 2 |
| Insulation | mica tape1, flame retardant | |
| Filler | Glass yarns | |
| core wraping | Core wrapping with glass-fibre tape as flame-protection | |
| Sheath | Corrugated Copper | |
| Outer covering (Optional) | Anticorrosion Outer Sheath PVC |
| Service Temperature | 90°C |
| Emergency Overload Temperature | 105°C |
| Short-Circuit Temperature | 250°C |
| Laying Temperature | should not be lower than 0°C |
| Minimum bending radius when laying | Single core: r = 6 x cable outer diameter |
| Sheath colour | The standard color is orange, other colors are available. |
| Nominal cross Section |
Nominal insulation thickness | Thickness of
metallic sheath |
Outer
Diameter approx. |
Ampacity | Voltage
drop |
| mm2 | mm | mm | mm | A | V/A.km |
| 3×16+1×10 | 1.0 | 0.80 | 16.56 | 85 | 2.54 |
| 3×25+1×16 | 1.0 | 0.90 | 19.77 | 118 | 1.59 |
| 3×35+1×16 | 1.1 | 1.00 | 22.18 | 150 | 1.16 |
| 3×50+1×25 | 1.2 | 1.00 | 25.87 | 192 | 0.85 |
| 3×70+1×35 | 1.2 | 1.00 | 29.81 | 228 | 0.59 |
| 3×90+1×50 | 1.2 | 1.00 | 34.04 | 273 | 0.43 |
Notes:
Ampacities based on 90°C conductor temperature and 40°C ambient temperature according to IEC 287 standard
The voltage drop based on conductor temperature 90°C is on the high side calculated only for reference
When the cable adopt compressed cores, diameter of cable should be 95% of normal diameter, diameter of metallic sheath should be adjusted correspondingly. When enhancing the insulation, outer diameter of cable is increased for about 5%.
1 Glass cloth reinforced Muscovite mica tape
2 Current ratings in Ampere (A) up to 30° C ambient temperature
