Rated Voltage 0.6/1kV Cross‑linked Polyethylene Insulated Grade B2 Flame‑retardant Power Cable

Main Technical Parameters

Grade B2 Flame-retardant Performance Analysis

Grade B2 is evaluated under the national standard GB 31247-2014. Unlike traditional standards (e.g., GB/T 19666's ZA/ZB/ZC grades) that only assess flame spread, GB 31247-2014 simulates real fire scenarios to comprehensively evaluate fire hazards.

Grade B2 Core Quantitative Indicators:
- Flame Spread (FS): <= 2.5m.
- Peak Heat Release Rate (HRR): <= 60kW.
- Total Heat Release in 1200s (THR1200): <= 30MJ.
- Fire Growth Rate Index (FIGRA): <= 300W/s.
- Peak Smoke Production Rate (SPR): <= 1.5m²/s.
- Total Smoke Production in 1200s (TSP1200): <= 400m².
- Minimum Transmittance (smoke density): >= 60%.

Additional Safety Information (mandatory for Grade B2):

IProduct Structure and Model Analysis

Product Structure:
- Conductor: Class 1 or Class 2 copper conductor; low resistivity with excellent conductivity.
- Insulation: Cross-linked polyethylene (XLPE) — chemically or physically cross-linked from linear PE to a 3D network structure, giving excellent heat resistance (up to 90°C), mechanical strength, and chemical corrosion resistance.
- Filling and wrapping: High-temperature flame-retardant filling ropes and LSZH high-resistance tapes for structural stability and auxiliary flame retardancy.
- Inner sheath/armoring (optional): Extruded LSZH inner sheath; optional steel tape armoring for mechanical protection.
- Outer Sheath: Low-smoke halogen-free flame-retardant polyolefin (LSZH): low combustion smoke volume, no release of halogenated hydrogen and other toxic corrosive gases.

Common Models:

Core Advantages and Application Scenarios

Core Advantages:
- Fire Safety: Meets GB 31247 Grade B2 flame-retardant standard with multidimensional assessment.
- Environmental Health: LSZH material — low smoke during combustion, high transmittance, no corrosive gases, protecting life and environment.
- Excellent Electrical and Mechanical Properties: High ampacity, heat resistance, abrasion resistance, impact resistance, acid/alkali/oil resistance, long service life.
- Full Regulatory Compliance: Designed per national standards and included in latest CCC mandatory certification.

Application Scenarios:
- High-density public venues: Airports, metro/rail stations, hospitals, schools, stadiums, large malls, and office buildings.
- Critical infrastructure: Power plants, urban lighting systems, renewable energy systems.
- Important distribution circuits: Non-firefighting critical distribution systems in high-rise buildings such as emergency lighting; low-voltage power transmission or control circuits.

Selection and Procurement Summary

1. Confirm Requirements: Specify cable model, core count, cross-section, and length.
2. Check Compliance: Verify compliance with GB/T 12706.1-2020 and GB 31247-2014.
3. Verify Certification: Per national market supervision requirements, all flame-retardant electric cables sold in China must carry CCC mandatory certification from July 1, 2025.
4. Detailed parameters (e.g., ampacity, outer diameter for specific cross-sections): Refer to the manufacturer's official technical specification sheet.