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This standard is primarily based on GB/T 12706.1-2020, “Extruded Insulated Power Cables and Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables for Rated Voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV),” as well as GB/T 19666-2019, “General Requirements for Flame‑Retardant and Fire‑Resistant Wires and Cables,” among other relevant standards. This product is intended for critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, (nuclear) power stations, steel mills, and shipbuilding facilities; advanced and essential public infrastructure, such as satellite earth stations, railway wiring systems, alarm systems, and fire‑protection systems; and environments where the safety of persons and property must be ensured, including historic buildings, hotels and guesthouses, high‑rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research institutes.
BTTZ cables, known domestically as fire‑resistant cables, have been manufactured on a dedicated production line that enables the company to produce magnesium oxide‑based cables in extended lengths—up to 1,000 meters per reel, compared with the traditional limit of 50–100 meters. This capability effectively addresses the drawbacks associated with short cable lengths and numerous splices, significantly reducing project investment costs, accelerating installation, and ensuring reliable, stable performance.
BTTZ cables, known domestically as fire‑resistant cables, have been manufactured on a dedicated production line that enables the company to produce magnesium oxide‑based cables in extended lengths—up to 1,000 meters per conductor, compared with the traditional limit of 50–100 meters. This capability effectively addresses the drawbacks associated with short cable lengths and numerous splices, significantly reducing project investment costs, accelerating installation, and ensuring reliable, stable performance.
This standard is primarily based on GB/T 12706.1-2020, "Extruded Insulated Power Cables and Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables for Rated Voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV)," as well as GB/T 19666-2019, "General Rules for Flame-Retardant and Fire-Resistant Wires and Cables," among other standards. This product is intended for critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, nuclear power stations, steel mills, and shipyards; advanced and essential public facilities like satellite ground stations, railway wiring systems, alarm systems, and fire protection systems; and locations where personal and property safety must be ensured, such as historic buildings, hotels, high-rise structures, museums, libraries, banks, hospitals, insurance companies, shopping malls, and research institutions.
Product Models and Nomenclature
Model Name
YTTW Copper-Conductor Corrugated Copper Sheath Inorganic Mineral Insulated Flexible Fire‑Resistant Cable
YTTWV Copper-Conductor Corrugated Copper Sheath Inorganic Mineral Insulated PVC‑Sheathed Flexible Fire‑Resistant Cable
YTTWY Copper-Conductor Corrugated Copper Sheath Inorganic Mineral Insulated Polyolefin‑Coated Anti‑Corrosion Flexible Fire‑Resistant Cable
Product Specifications
Model Rated Voltage Number of Cores Nominal Cross‑Section (mm²)
YTTW YTTWV YTTWY 450/750 V 0.6/1 kV 1 1.0–630
2 1.0–300
3 1.0–240
4 1.0–185
3+1 3×16+1×10
3×25+1×16
3×35+1×16
3×50+1×25
3×70+1×35
3×95+1×50
3×120+1×70
3×150+1×70
3×185+1×95
3×240+1×120
3+2 3×25+2×16
3×35+2×16
3×50+2×25
3×70+2×35
4+1 4×16+1×10
4×25+1×16
4×35+1×16
4×50+1×25
4×70+1×35
5–7 1.0–4.0
12–37 1.0–2.5
Nominal Thickness of the Copper Sheath
Nominal Cross‑Section (mm²) Nominal Thickness of Copper Sheath (mm)
1 Core 0.4
2 Cores 0.4
3 Cores 0.4
4 Cores 0.4
5 Cores 0.45
7 Cores 0.45
12 Cores 0.4
19 Cores 0.4
24 Cores 0.4
30 Cores 0.4
37 Cores 0.4
1.0 0.4
1.5 0.4
2.5 0.4
4 0.4
6 0.4
10 0.4
16 0.4
25 0.4
35 0.45
50 0.5
70 0.5
95 0.5
120 0.5
150 0.5
185 0.5
240 0.6
300 0.6
400 0.6
500 0.6
630 0.6
Note: For core counts not listed, the nominal thickness of the copper sheath shall be selected as the value closest to that specified for the corresponding core count.
This standard is primarily based on GB/T 12706.1-2020, “Extruded Insulated Power Cables and Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables for Rated Voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV),” as well as GB/T 19666-2019, “General Requirements for Flame‑Retardant and Fire‑Resistant Wires and Cables,” among other relevant standards. This product is intended for critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, (nuclear) power stations, steel mills, and shipbuilding facilities; advanced and essential public infrastructure, such as satellite earth stations, railway wiring systems, alarm systems, and fire‑protection systems; and environments where the safety of persons and property must be ensured, including historic buildings, hotels and guesthouses, high‑rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research institutes.
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