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Flexible Fire-Resistant Cable
Fire-resistant cables can withstand flame temperatures of 950°C to 1000°C during testing, with a burning duration of 120 minutes. They also meet the fire-resistance performance requirements specified in BS6387:2013—specifically, they maintain circuit integrity after undergoing individual fire tests, as well as combined tests involving fire exposure followed by water immersion and mechanical vibration, conducted sequentially in the order of C, W, and Z on the same cable sample. Thanks to their exceptional fire protection capabilities, these cables are primarily used in high-risk, densely populated areas such as hospitals, shopping malls, office buildings, and luxury hotels, effectively safeguarding both human life and property.
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Fire-resistant cable
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Phone:+86-18100332877
Fire-resistant cables can withstand flame temperatures of 950°C to 1000°C during testing, with a burning duration of 120 minutes. They also meet the fire-resistance performance requirements specified in BS6387:2013—specifically, simple fire resistance, fire resistance combined with water exposure, and fire resistance combined with mechanical vibration—all tested sequentially on the same sample in the order of C, W, and Z—while maintaining circuit integrity. Thanks to their exceptional fire protection capabilities, these cables are primarily used in high-occupancy areas such as hospitals, shopping malls, office buildings, and upscale hotels, effectively safeguarding both human life and property.
I. Mineral-insulated cables rated 750V and below
Implementation standard: GB/T 13033-2007
Common models and names
Model Number | Voltage | Name |
BTTQ | 500V | Lightweight Copper-Core, Copper-Sheathed Mineral-Insulated Cable |
BTTVQ | 500V | Lightweight copper-core, copper-sheathed mineral-insulated PVC-jacketed cable |
BTTYQ | 500V | Lightweight copper-core, copper-sheathed mineral-insulated, halogen-free, low-smoke jacketed cable |
BTTHQ | 500V | Lightweight Copper-Core Copper-Alloy Sheathed Mineral-Insulated Cable |
BTTHVQ | 500V | Lightweight copper-core copper alloy-sheathed mineral-insulated PVC-jacketed cable |
BTTHYQ | 500V | Lightweight copper-core copper alloy-sheathed mineral-insulated halogen-free low-smoke jacketed cable |
BTTZ | 750V | Heavy-duty copper-core copper-sheathed mineral-insulated cable |
BTTVZ | 750V | Heavy-duty copper-core copper-sheathed mineral-insulated PVC-jacketed cable |
BTTYZ | 750V | Heavy-duty copper-core, copper-sheathed mineral-insulated, halogen-free, low-smoke jacketed cable |
BTTHZ | 750V | Heavy-duty copper-core copper alloy-sheathed mineral-insulated cable |
BTTHVZ | 750V | Heavy-duty copper-core copper alloy-sheathed mineral-insulated PVC-jacketed cable |
BTTHYZ | 750V | Heavy-duty copper-core copper alloy-sheathed mineral-insulated halogen-free low-smoke jacketed cable |
Insulation resistance
The product of insulation resistance (MΩ) and cable length (km) should be no less than 1000 MΩ·km. When the cable length is less than 100 meters, the measured insulation resistance must be at least 10,000 MΩ.
Finished Cable Voltage Testing
For 500V cables, an AC test voltage of 2000V should be applied; for 750V cables, an AC test voltage of 2500V is required. The minimum ramp-up rate must be 150V/s, and each test must last for 15 minutes. The test voltage should be applied as follows:
a. Each conductor is connected in turn to all the other conductors that are linked together;
b. Between all conductors and the copper sheath.
During the test, the cable should not break down.
II. Metal-Sheathed Inorganic Mineral Insulated Cables Rated for 0.6/1 kV and Below
Implementation Standard: JG/T 313-2014
Common model names
Model Number | Voltage | Name |
YTTW | 0.6/1kV | Copper-core cloud-rolled textured copper-sheathed inorganic mineral-insulated cable |
YTTWV | 0.6/1kV | Copper-core cloud-rolled textured copper-sheathed inorganic mineral-insulated PVC-jacketed cable |
YTTWY | 0.6/1kV | Copper-core cloud-rolled textured copper sheath, inorganic mineral-insulated, halogen-free, low-smoke polyolefin outer-sheathed cable |
YTTWG | 0.6/1kV | Copper-core cloud-glossy surface copper-sheathed inorganic mineral-insulated cable |
YTTWGV | 0.6/1kV | Copper-core, cloud-glossy surface, copper-sheathed, inorganic mineral-insulated PVC-jacketed cable |
YTTWGY | 0.6/1kV | Copper-core, cloud-glossy surface, copper-sheathed, inorganic mineral-insulated, halogen-free, low-smoke polyolefin outer-sheathed cable |
Insulation resistance
The product of insulation resistance (MΩ) and cable length must be at least 100 Ω·km. When the cable length is less than 100 meters, the measured insulation resistance should not fall below 1000 MΩ.
Power plant testing
For 500V cables, an AC test voltage of 2000V should be applied; for 0.6/1kV cables, the AC test voltage should be 3500V. During the 15-minute AC voltage application, no breakdown should occur. Similarly, when testing an entire reel (or coil), the AC voltage must be applied for 5 minutes without causing any breakdown.
Minimum bending radius for cable installation
Cable outer diameter/mm | D ≤ 12 | 12 < D ≤ 20 | 20 < D ≤ 40 | D > 40 |
Minimum cable bending radius | 6D | 10D | 15D | 20D |
| Note: D represents the cable outer diameter | ||||
Fire resistance performance
The cable meets the fire-resistance test procedures specified in GB/T 19216.21, with a flame temperature of 950°C to 1000°C and a burning duration of 180 minutes. Additionally, it complies with the fire-performance requirements outlined in BS6387:2013, successfully passing individual fire tests as well as combined tests involving fire exposure, water immersion, and mechanical vibration—conducted sequentially on the same sample in the order of C, W, and Z—while maintaining circuit integrity throughout.
3. Mica Tape Mineral-Insulated Corrugated Copper-Sheathed Cables Rated for 0.6/1 kV and Below
Implementation Standard: GB/T34926-2017
Common model names
Model Number | Voltage | Name |
RTTZ | 450/750V | Copper-core mica tape mineral-insulated corrugated copper-sheathed control cable |
RTTYZ | 450/750V | Copper-core mica tape, mineral-insulated, corrugated copper-sheathed polyolefin outer-sheathed control cable |
RTTVZ | 450/750V | Copper-core mica tape mineral-insulated corrugated copper-sheathed PVC-jacketed control cable |
RTTZ | 0.6/1kV | Copper-core mica tape mineral-insulated corrugated copper-sheathed power cable |
RTTYZ | 0.6/1kV | Copper-core mica tape mineral-insulated corrugated copper-sheathed polyolefin-jacketed power cable |
RTTVZ | 0.6/1kV | Copper-core mica tape mineral-insulated corrugated copper-sheathed PVC-jacketed power cable |
Power plant testing
For 450/75V cables, an AC test voltage of 3000V should be applied; for 0.6/1kV cables, the AC test voltage should be 3500V. During the 5-minute application of the AC voltage, no breakdown should occur.
When using DC voltage, the DC voltage should be 2.4 times the power-frequency voltage value.
Minimum allowable bending radius during cable installation
Cable outer diameter mm | Minimum cable bending radius | Minimum bending radius for cables near the junction box and terminals |
D ≤ 12 | 6D | 4D |
12 < D ≤ 20 | 10D | 8D |
20 < D ≤ 40 | 15D | 13D |
D > 40 | 20D | 18D |
| Note: D represents the actual outer diameter of the finished cable; care should be taken to control bending, for example, by using a shaped guide plate. | ||
Fire resistance performance
During the test, the flame temperature was between 950°C and 1000°C, with a burn duration of 180 minutes.
Product-measured outer diameter D/mm | Test Requirements |
D ≤ 20 | The circuit remained intact when tested according to C, W, and Z as specified in BS6387:2013. |
D > 20 | Tested according to BS8491:2008, the circuit remains intact. |
4. Flexible Fire-Resistant Cables
1. Mineral-insulated metal-sheathed cables rated for 0.6/1 kV and below
Common model names
Model Number | Voltage | Name |
NG-A | 0.6/1kV | High-performance copper-core mineral-insulated aluminum-sheathed flexible fire-resistant cable |
BTLY | 0.6/1kV | Copper-core mineral-insulated aluminum-sheathed low-smoke, halogen-free, polyolefin-sheathed flexible fire-resistant cable |
BTLHY | 0.6/1kV | Copper-core mineral-insulated aluminum alloy-sheathed low-smoke, halogen-free polyolefin-sheathed flexible fire-resistant cable |
2. Mineral-insulated fire-resistant cables rated for 0.6/1 kV and below
Common model names
Model Number | Voltage | Name |
BBTRZ | 0.6/1kV | Heavy-duty copper-core mineral-insulated, low-smoke, halogen-free, polyolefin-sheathed, ultra-flexible, fire-resistant cable |
RTXMY | 0.6/1kV | Copper-core mineral-insulated, low-smoke, halogen-free, polyolefin-sheathed, ultra-flexible, fire-resistant cable |
Power plant testing
The cable shall be subjected to an AC test voltage of 3500V, and during the 5-minute application of this AC voltage, it should not break down. When using DC voltage instead, the DC voltage must be 2.4 times the value of the power-frequency voltage.
Fire resistance performance
During the test, the flame temperature was between 950°C and 1000°C, with a combustion duration of 180 minutes.
Product-measured outer diameter D/mm | Test Requirements |
D ≤ 20 | The circuit remained intact when tested according to C, W, and Z as specified in BS6387:2013. |
D > 20 | Tested according to BS8491:2008, the circuit remains intact. |
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Phone:+86-18100332877
Email:969228460@qq.com
Address: Chengguan Town, Linying County, Luohe City, Henan Province
