1. Executive Standards
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GB/T 12706.1-2008 "Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 35kV — Part 1: Cables for rated voltages of 1kV and 3kV"
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GB/T 19666-2005 "General rules for flame retardant and fire resistant wires and cables"
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GA 306-2007 "Flame retardant and fire resistant cables: Classification and requirements for plastic insulated flame retardant and fire resistant cables"
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IEC 60502-1 — International equivalent standard
The product must pass CCC mandatory certification or CQC certification, and a flame retardant performance report issued by a third-party testing institution must be provided.
2. Product Construction (From Inside to Outside)
WDZB-YJE22 features a typical five-layer composite armored construction:
🔹 ① Conductor
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Material: High-purity oxygen-free copper (TU1/TU2)
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Construction: Class 1 (solid) or Class 2 (stranded) copper conductor
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Specification: 3×120mm² (phase conductors L1/L2/L3) + 2×70mm² (typically 1×N neutral conductor + 1×PE protective earth conductor)
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120mm² conductor construction reference: 24 wires / individual wire diameter 2.52mm, stranded
🔹 ② Insulation Layer
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Material: Cross-linked polyethylene (XLPE)
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Long-term temperature rating 90℃, short-circuit (≤5s) allowable temperature not exceeding 250℃
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120mm² insulation thickness ≥ 1.2mm
🔹 ③ Filler Layer
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Filled with alkali-free fiberglass rope or PVC composite material to ensure a round cable core
🔹 ④ Wrapping Tape
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Flame-retardant non-woven fabric or polyester tape wrapped as an isolation and buffer layer
🔹 ⑤ Inner Sheath
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Material: Low-smoke halogen-free flame-retardant polyolefin
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Thickness ≥ 1.2mm
🔹 ⑥ Armor Layer (Core Feature)
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Double steel tape armor (Type 22)
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Function: Compression resistance, impact resistance, resistance to mechanical external forces; suitable for direct burial installation
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Steel tape specification: 30×0.50mm double steel tape wrapped
🔹 ⑦ Outer Sheath
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Material: Low-smoke halogen-free flame-retardant polyolefin
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Color: Black (or as per customer requirements)
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Thickness ≥ 2.1mm
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Characteristics: Flame retardant Class B, halogen-free, low smoke, UV resistant, weather resistant
