This product is suitable for fire-fighting power distribution lines in densely populated places with rated voltages of 0.6/1kV and below, super high-rise buildings and densely populated places such as airports, subways, hospitals, hotels, large shopping malls, convention and exhibition centers, and finance, telecommunications, radio and television, and power dispatch , Non-fire load lines of important buildings such as data centers. Product performance standards GB 31247-2014 Classification of burning performance of cables and optical cables GB/T 12706.1-2020 Rated voltage 1kV (Um=1.2kV) to 35kV (Um=40.5kV) extruded insulated power cables and accessories Part 1: Rated voltage 1kV (Um=1.2kV) and 3kV (Um=3.6kV) )cable GB/T 19666-2019 Flame-retardant and fire-resistant wire, cable or optical cable general rules product structure WDZB1-YJY cable is composed of conductor, insulation layer, filling layer (except single-core cable), isolation layer and outer sheath from inside to outside, as shown in Figure 1. WDZB1-YJY23 cable is composed of conductor, insulation layer, filling layer, isolation layer, inner lining layer, armor layer and outer sheath from inside to outside, as shown in Figure 2. WDZB1N-YJY cable is composed of conductor, fire-resistant layer, insulating layer, filling layer (except single-core cable), isolation layer and outer sheath from inside to outside, as shown in Figure 3. WDZB1N-YJY23 cable is composed of conductor, refractory layer, insulation layer, filling layer, isolation layer, inner lining layer, armor layer and outer sheath from inside to outside, as shown in Figure 4. WDZB1-BBTRZ cable is composed of conductor, mineral insulation layer, plastic insulation layer, filling layer, isolation layer and outer sheath from inside to outside, as shown in Figure 5. WDZB1-BTLY type cable is composed of conductor, mineral insulation layer, insulation protection layer, aluminum sheath, filling layer, isolation layer and outer sheath from inside to outside, as shown in Figure 6. The aluminum sheath of multi-core cables of 10mm2 and below is a turnkey structure, located between the filling layer and the isolation layer.