BTTZ cables, known domestically as fire-resistant cables, have seen the company invest heavily in recent years to establish a dedicated production line capable of manufacturing magnesium oxide cables in significantly longer lengths—up to 1,000 meters per cable, compared to the traditional limit of 50–100 meters per cable. This breakthrough effectively addresses the common challenges posed by shorter cable lengths and numerous joints, such as increased installation complexity and higher costs. As a result, it substantially reduces project investment expenses for users, accelerates installation processes, and ensures reliable, stable operation of the products.

BTTZ cables, known domestically as fire-resistant cables, have seen the company invest heavily in recent years to establish a dedicated production line capable of manufacturing magnesium oxide cables in significantly longer lengths—up to 1,000 meters per cable, compared to the traditional limit of 50–100 meters per cable. This breakthrough effectively addresses the common challenges posed by shorter cable lengths and numerous joints, such as increased installation complexity and higher costs. As a result, it substantially reduces project investment expenses for users, accelerates installation processes, and ensures reliable, stable operation of the products.

This standard is primarily based on GB/T 12706.1-2020, "Extruded Insulated Power Cables and Accessories Rated from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables Rated at 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV)," as well as GB/T 19666-2019, "General Specifications for Flame-Retardant and Fire-Resistant Wires and Cables." This product is designed for use in critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, nuclear power plants, steel mills, and shipbuilding facilities. It is also suitable for advanced, high-priority public infrastructure projects like satellite ground stations, railway wiring systems, alarm and fire protection systems, and other essential installations. Additionally, it ensures safety in environments where protecting human life and property is paramount, such as historic buildings, hotels, high-rise structures, museums, libraries, banks, hospitals, insurance facilities, shopping centers, and research institutions. --- **Product Models and Designations** | **Model** | **Name** | |------------------|---------------------------------------| | YTTW | Copper-Core Corrugated Copper Sheath Inorganic Mineral Insulated Flexible Fireproof Cable | | YTTWV | Copper-Core Corrugated Copper Sheath Inorganic Mineral Insulated PVC-Sheathed Flexible Fireproof Cable | | YTTWY | Copper-Core Corrugated Copper Sheath Inorganic Mineral Insulated Polyolefin-Anticorrosive Outer Sheath Flexible Fireproof Cable | --- **Product Specifications** | **Model** | **Rated Voltage** | **Number of Cores** | **Nominal Cross-Section Area (mm²)** | |------------------|-------------------|---------------------|--------------------------------------| | YTTW | 450/750 V | 1 | 1.0–630 | | YTTWV | 450/750 V | 2 | 1.0–300 | | YTTWY | 450/750 V | 3 | 1.0–240 | | YTTW | 0.6/1 kV | 4 | 1.0–185 | | YTTW | 0.6/1 kV | 3+1 | 3×16 + 1×10 | | YTTW | 0.6/1 kV | 3×25 + 1×16 | | | YTTW | 0.6/1 kV | 3×35 + 1×16 | | | YTTW | 0.6/1 kV | 3×50 + 1×25 | | | YTTW | 0.6/1 kV | 3×70 + 1×35 | | | YTTW | 0.6/1 kV | 3×95 + 1×50 | | | YTTW | 0.6/1 kV | 3×120 + 1×70 | | | YTTW | 0.6/1 kV | 3×150 + 1×70 | | | YTTW | 0.6/1 kV | 3×185 + 1×95 | | | YTTW | 0.6/1 kV | 3×240 + 1×120 | | | YTTW | 0.6/1 kV | 3+2 | 3×25 + 2×16 | | YTTW | 0.6/1 kV | 3×35 + 2×16 | | | YTTW | 0.6/1 kV | 3×50 + 2×25 | | | YTTW | 0.6/1 kV | 4+1 | 4×16 + 1×10 | | YTTW | 0.6/1 kV | 4×25 + 1×16 | | | YTTW | 0.6/1 kV | 4×35 + 1×16 | | | YTTW | 0.6/1 kV | 4×50 + 1×25 | | | YTTW | 0.6/1 kV | 4×70 + 1×35 | | | YTTW | 0.6/1 kV | 5–7 | 1.0–4.0 | | YTTW | 0.6/1 kV | 12–37 | 1.0–2.5 | --- **Copper Sheath Nominal Thickness** | **Nominal Cross-Section Area (mm²)** | **Copper Sheath Nominal Thickness (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 | Note: For cross-sectional areas above 4 mm², the copper sheath thickness increases to 0.45 mm for 5–7 cores and 0.5 mm for 12–37 cores. 16 0.4 0.45 0.45 0.5 0.5 / / / / / / 25 0.4 0.5 0.5 0.5 0.5 / / / / / / 35 0.45 0.5 0.5 0.5 0.5 / / / / / / 50 0.5 0.5 0.5 0.6 0.6 / / / / / / 70 0.5 0.5 0.6 0.6 0.6 / / / / / / 95 0.5 0.5 0.6 0.6 0.6 / / / / / / 120 0.5 0.5 0.6 0.6 0.6 / / / / / / 150 0.5 0.6 0.6 0.7 0.7 / / / / / / 185 0.5 0.6 0.6 0.7 0.7 / / / / / / 240 0.6 0.6 0.6 0.7 0.7 / / / / / / 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 should be rounded to the nearest value specified for that particular core count.

This standard is primarily based on GB/T 12706.1-2020, "Power Cables with Extruded Insulation and Their Accessories Rated from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV) — Part 1: Cables Rated 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." This product is designed for use in critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, nuclear power plants, steel mills, and shipbuilding facilities; advanced and essential public infrastructure like satellite ground stations, railway wiring systems, alarm and fire protection systems; and environments where safeguarding human life and property is paramount—such as historic buildings, hotels, high-rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research facilities.

This standard is primarily based on GB/T 12706.1-2020, "Power Cables with Extruded Insulation and Their Accessories Rated from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV) — Part 1: Cables Rated 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." This product is designed for use in critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, nuclear power plants, steel mills, and shipbuilding facilities; advanced and essential public infrastructure like satellite ground stations, railway wiring systems, alarm and fire protection systems; and environments where safeguarding human life and property is paramount—such as historic buildings, hotels, high-rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research facilities.