Rated Voltage 0.6/1kV Cross‑linked Polyethylene Insulated (Flame‑retardant, Fire‑resistant) Power Cable

Main Implementation Standards

- GB/T 12706.1: Requirements for basic structure, dimensions, electrical, and mechanical properties.
- GB/T 19666-2019: General rules for flame retardant and fire resistant characteristics.
- IEC 60502-1: International standard for power cables with extruded insulation for rated voltages from 1kV to 30kV.
- GB/T 19216.21: Tests for electric cables under fire conditions — Circuit integrity.
- GB/T 18380 (Series): Tests on electric and optical fiber cables under fire conditions.

Usage Characteristics (Technical Parameters)

1. Rated Voltage: Rated voltage U0/U is 0.6/1 kV, maximum system voltage Um is 1.2 kV, and the applicable frequency is 50 Hz.
2. Temperature Parameters:
   - Maximum long-term allowable working temperature of conductor: 90°C.
   - Maximum conductor temperature during short circuit (max 5s): 250°C.
   - Ambient temperature for cable laying: Not lower than 0°C (preheating required if lower).
3. Minimum Bending Radius (D is outer diameter):
   - Single-core: 20D (Unarmored) / 15D (Armored).
   - Multi-core: 15D (Unarmored) / 12D (Armored).
4. Electrical Performance: AC voltage test (routine test) is 3.5 kV / 5 min without insulation breakdown. Insulation volume resistivity is not less than 1 x 10^12 ohm·cm at 90°C.

Cable Structure and Materials

- Conductor: Uses Class 1 (solid) or Class 2 (stranded) copper or aluminum conductors. Copper is recommended for high reliability, while aluminum is suitable for cost-sensitive projects.
- Insulation: Cross-linked polyethylene (XLPE), providing high temperature resistance, low dielectric loss, and high mechanical strength.
- Filling and Cabling: Multi-core cables are cabled with non-hygroscopic filling materials to ensure a round shape.
- Armoring Layer (Optional): Includes steel tape armoring (Codes 22, 23) for pressure resistance and steel wire armoring (Codes 32, 33) for tensile strength.
- Sheath: Options include PVC (V) for general use, PE (Y) for moisture resistance, and LSZH (E) for personnel-intensive places.
- Fire-resistant Layer (Fire-resistant type only): A mica tape layer is wrapped between the conductor and insulation to ensure the cable remains functional during a fire (withstanding temperatures over 800°C).

Flame-retardant and Fire-resistant Performance

1. Flame-retardant (ZR): Uses flame-retardant additives to inhibit flame spread. Divided into Classes A (ZA), B (ZB), C (ZC), and D (ZD). Class A offers the highest performance.
2. Fire-resistant (NH): Uses a mica tape isolation layer to maintain circuit integrity in flames. It is divided into Class A (950-1000°C for 180 min) and Class B/C (830°C for 90 min).

Common Models and Naming Rules

- YJV / YJLV: Copper / Aluminum core basic type, PVC sheath.
- YJV22 / YJLV22: Copper / Aluminum core armored type, PVC sheath.
- ZR-YJV / ZA-YJV: Flame-retardant (Class C / Class A) power cables.
- NH-YJV: Fire-resistant power cable.
- WDZN-YJY: LSZH flame-retardant fire-resistant power cable.

Specification Range

- Cores: Available in 1 to 5 cores (including 3+1, 4+1, 3+2 configurations).
- Cross-section: Generally 1.5 to 240 mm² for copper cores; single-core options can extend up to 1000 mm².

Ampacity Reference (YJV22 Example)

- 4 mm²: 50A (Air) / 73A (Buried).
- 25 mm²: 153A (Air) / 194A (Buried).
- 185 mm²: 595A (Air) / 594A (Buried).
Note: Values are for reference and must be adjusted based on actual installation conditions.

Laying and Installation Requirements

Laying temperature must be at or above 0°C. Armored models (YJV22) are suitable for direct burial, whereas steel wire armored types (YJV32) are designed for vertical installation.

Recommended Application Scenarios

- Commercial and high-rise buildings: ZA-YJV or NH-YJV.
- Fire protection systems: NH-YJV or WDZN-YJY.
- Industrial use: YJV or YJV22.

Product Advantages

1. High Heat Resistance: Operating at 90°C allows for higher ampacity or the use of smaller cross-sections compared to standard PVC cables.
2. Excellent Insulation: Low dielectric constant and high resistivity reduce electrical losses.
3. Mechanical Strength: Durable construction and armoring options withstand harsh installation environments.

Precautions for Purchase

Always verify compliance with standards GB/T 12706.1 and GB/T 19666. Choose the appropriate flame-retardant and fire-resistant grades based on project requirements to ensure safety and cost-effectiveness. Ensure products pass the 3.5kV/5min AC voltage test before leaving the factory.