Rated Voltage 0.6/1kV Cross‑linked Polyethylene Insulated Grade B1 Flame‑retardant Power Cable

Model Designation and Description

Model code meanings: WD — Halogen-free low-smoke; ZB1 — Grade B1 flame-retardant; N — Fire-resistant; YJ — XLPE insulation; Y — Polyolefin sheath; 23 — Steel tape armoring.

Implementation Standards

Usage Characteristics and Technical Parameters

Electrical Performance:
- Rated Voltage (U0/U): 0.6/1kV; Frequency: 50Hz.
- AC Voltage Test: 3500V for 15 minutes without breakdown.
- Insulation Resistance Constant: >= 3.67 MOhm·km.

Working Temperature:
- Max long-term conductor temperature: 90°C.
- Max short-circuit temperature (<= 5s): 250°C.
- Laying temperature: >= 0°C (preheat if necessary).

Specification Range: 1.5 to 1000 mm²; 1, 2, 3, 4, 5 cores (including multi-core combinations).

Grade B1 Combustion Performance Details

Combustion Performance Classification: Per GB 31247-2014:
- Grade A: Non-combustible cables.
- Grade B1: Flame-retardant Level 1 (this product).
- Grade B2: Flame-retardant Level 2.
- Grade B3: Ordinary cables.

Important: Grade B1 is NOT the same as the ordinary flame-retardant Class B cable. Grade B1 evaluation involves over ten indicators including heat release, smoke characteristics, and smoke toxicity — far more stringent than the standard flame-retardant Grade B cable (which only assesses char height). Grade B1 cables must be halogen-free low-smoke eco-friendly cables.

Grade B1 Core Performance Indicators:

Additional Classification Indicators:
- Flaming droplets/particles: d0, d1, d2. Grade B1 typically requires d0 (no flaming droplets in 1200s).
- Smoke toxicity: t0, t1, t2. Grade B1 typically requires t0 or t1.
- Corrosivity: a1, a2, a3.

Per DGJ08-2048-2016 and GB 50016-2018, super-high-rise buildings should select cables with combustion performance Grade B1 or above, toxicity t0, and droplet grade d0.

Product Structure

1. Conductor: Oxygen-free copper rod, resistivity below 0.01700 Ohm·mm²/m; approximately 8% more energy-efficient than standard copper rod.
2. Insulation: XLPE material using chemical cross-linking to convert linear PE into a 3D network structure with enhanced mechanical properties.
3. Filling and Oxygen Barrier Layer (armored type): Metal hydrates such as magnesium hydroxide release crystalline water during combustion, lowering cable flame temperature.
4. Armoring (YJY23 type): Double-layer galvanized steel tape gap winding; resists accidental mechanical force. The oxygen barrier design significantly improves flame-retardant and fire-resistant performance.
5. Sheath: Low-smoke halogen-free high-resistance polyolefin with excellent anti-corrosion properties.

VII. Main Application Scenarios

This product has been used in numerous major projects including Beijing Metro, Shenzhen Metro, Xi'an Metro, Shanghai Metro, and Suzhou Metro.

Selection and Acceptance Notes

1. Check Product Markings: Legitimate Grade B1 cables will clearly indicate "Grade B1 flame-retardant" on the product.
2. Request Certification Documents: Require supplier to provide combustion performance test reports and Combustion Performance Mark Authorization Certificate.
3. Verify Standards Compliance: Confirm compliance with GB 31247-2014 (combustion performance classification) and GB/T 12706.1-2020 (structural performance).
4. Additional Grade Selection: Select appropriate droplet grade (d0/d1), smoke toxicity (t0/t1), and corrosivity grade based on building type and usage requirements.