Flame‑retardant Aluminum Alloy Power Cable

Implementation Standards

1. Core Product Standard: GB/T 31840 series (Aluminum alloy core extruded insulated power cables for rated voltages from 1kV to 35kV). Note: GB/T 31840.1-2015 has been superseded by GB/T 31840.1-2025. Please refer to the latest version.
2. Flame-retardant Standard: GB/T 19666-2019 (or GB/T 19666-2005) General rules for flame retardant and fire resistant cables.
3. Industry Standard: NB/T 42051-2015 (0.6/1kV aluminum alloy conductor XLPE insulated cables).

Main Model Series

Flame-retardant type: "Z(A/B/C)-" prefix, where Grade A is highest. LSZH flame-retardant type: "WDZ(A/B/C)-" prefix.

Main Technical Parameters

Conductor Performance:
- Conductivity: 61.5% IACS; for the same ampacity, cross-section is 1.5x copper but weight is only half.
- Creep Resistance: 3x ordinary aluminum, equivalent to copper.
- Elongation: >= 30% after annealing; lower spring-back than copper.
- Fill Factor: > 95% using compact wire technology.

Electrical Performance:
- Conductor DC resistance (20°C): Complies with national standard limits (e.g., 25mm²: <= 1.15 Ohm/km; 630mm²: <= 0.047 Ohm/km).
- Insulation resistance: >= 1000 MOhm·km.
- AC withstand voltage: 3.5kV for 4 hours (1kV cable); proportionally higher for higher voltage cables.

Flame-retardant Performance (per GB/T 18380 vertical burning test):
- Grade A: Flame spread <= 2.5m, self-extinguishing time <= 60s.
- Grade B: Flame spread <= 4.0m.
- Grade C: Flame spread <= 6.0m.

Usage Environment Parameters:
- Rated Voltage U0/U: 0.6/1kV to 26/35kV.
- Max long-term working temperature: 90°C.
- Max short-circuit temperature (<= 5s): 250°C.
- Laying temperature: >= 0°C.
- Minimum Bending Radius: Single-core unarmored 20D; multi-core unarmored 15D; single-core armored 15D; multi-core armored 12D (D = outer diameter).

Product Structure

1. Conductor: AA8000 series aluminum alloy with creep resistance, high flexibility, high elongation, low spring-back, and stable connection properties.
2. Insulation: XLPE at 90°C; heat-resistant, fire-resistant, aging-resistant, durable, and eco-friendly.
3. Armoring (type-dependent): Aluminum alloy interlocking armor — lighter, easier to strip, no cable tray required; can bend naturally at corners.
4. Sheath (type-dependent): Eco-friendly PVC; suitable for damp locations, direct burial, or concrete embedding.

Core Product Advantages

1. Flame-retardant Safety: Supports Grade A through C full range of flame-retardant grades; low-smoke halogen-free type (WDZ series) significantly reduces toxic gases and smoke during combustion.
2. Corrosion Resistance: Superior acid, alkali, and salt resistance; reliable long-term performance under harsh conditions.
3. Cost Advantage: Approximately 30% to 50% cheaper than copper cables for the same electrical performance; installation costs also lower due to lighter weight.
4. Energy-saving and Environmental: Lower impact on global warming, eutrophication, and environmental acidification compared to copper cables.

Application Areas

- Buildings: Real estate, commercial real estate, industrial real estate, large venues.
- Municipal Engineering: Urban road lighting, highways, tunnels, metro.
- Renewable Energy: Photovoltaic plants, wind farms, EV charging stations.
- Industrial Facilities: Factory workshops, mining areas, chemical production zones.
- Power Systems: Power transmission and distribution lines, distribution network upgrades.

Specification Range

- Cores: 1 to 5 cores.
- Cross-section: 10 to 300 mm² (1kV to 3kV); 25 to 630 mm² single-core, 10 to 500 mm² multi-core (6kV to 35kV).
- Voltage: 0.6/1kV to 26/35kV.