Selecting the correct cable for each segment of a photovoltaic (PV) plant is non-negotiable for safety, efficiency, and longevity. While dedicated solar cables like PV1-F are mandatory for the DC side, a different workhorse takes over on the alternating current (AC) side: the YJV 95mm² cable. At JZD Cable, we emphasize a crucial rule: YJV cables are strictly for AC applications and must NEVER be used for DC-side connections (e.g., between modules, combiners, or to the inverter’s DC input). This guide details the proper and powerful role of the YJV 95mm² in large-scale solar energy systems.
Core Positioning: The High-Current AC Main, NOT a DC Cable
The YJV 95mm² (copper conductor, XLPE insulated, PVC sheathed, 0.6/1kV, compliant with GB/T 12706) is the high-capacity main cable for the AC side of a PV plant. Its domain is exclusively from the inverter output to the grid connection point—be that a main AC combiner panel, a low-voltage switchgear, or a step-up transformer.
CRITICAL WARNING: Using standard YJV cable on the DC side is a severe and costly mistake. It lacks UV stabilization, has insufficient temperature rating for DC environments, and its materials are not designed for continuous DC stress. Outdoor DC use leads to rapid degradation, cracking, and failure within 1-3 years, posing significant fire and safety risks.
Technical Specifications: Engineered for High Power
1. Model & Voltage
- Standard Configurations:
YJV-3x95+1x50(3 phases + 1 neutral) orYJV22-3x95+1x50(steel tape armored for mechanical protection). - Rated Voltage: 0.6/1kV, perfectly suited for 380V/400V three-phase AC systems.
2. Current Carrying Capacity (Ampacity)
- Free Air (40°C ambient): Approximately 245A (per GB/T 12706).
- Direct Burial: Approximately 220A. Derating is essential for multiple cables laid together or higher ambient temperatures (approx. 8% reduction per 10°C rise).
- Design Safety Margin: Operational current should not exceed 80% of the ampacity (≈ 196A) to match inverter maximum output and ensure safe, cool operation.
3. Electrical Performance
- DC Resistance (20°C): ≤ 0.193 Ω/km for the 95mm² conductor, ensuring low voltage drop and minimal power loss over distance.
4. Environment & Lifespan
- Operating Temperature: Conductor rated for 90°C continuous, with short-circuit withstand of 250°C for 5s.
- Application: Designed for indoor cable trays, cable trenches, or direct burial (armored version). It is strictly forbidden for unprotected outdoor exposure.
- Lifespan: When installed correctly in its intended environment, its service life exceeds 25 years, matching the PV plant’s operational cycle.
Key Application Scenarios (AC Side Only)
1. Inverter to Low-Voltage AC Combiner/Main Panel (Main Feeder)
- This is its primary role. It connects the output of medium-to-large inverters to the main AC collection point.
- Typical Match: Ideal for 150kW to 250kW string inverters or 300kW to 500kW central inverters (380V/400V output).
- Use Case: Parallel connection of multiple inverters, longer cable runs (50m to 200m), and high-current transmission (180A to 230A) where controlling voltage drop to ≤2% is critical. Common in C&I rooftop, ground-mount, and large distributed generation plants.
2. Low-Voltage Panel to Step-Up Transformer (LV Incoming Line)
- In centralized plants, multiple inverter feeder circuits are combined and connected to the 0.4kV side of a step-up transformer using this cable.
- Typical Power: Can handle aggregated power in the range of 500kW to 1000kW.
- Installation: For direct burial or cable trench applications, the armored version
YJV22-3x95+1x50is mandatory for protection against rodent damage and mechanical stress.
3. Demanding & Special Applications
- Harsh Environments: For high-altitude, high-temperature plants, or coastal/salty areas, specify the WDZ-YJV22 variant (Low Smoke Zero Halogen, Flame Retardant, Armored).
- Energy Storage Systems (ESS): Suitable for the high-current AC output connection of Power Conversion Systems (PCS).
Installation & Wiring Code
1. Installation Methods
- Indoor/Cable Tray: Use standard YJV in indoor trays, cable trenches, or protected rooftop conduits. Fix at intervals ≤1.5m. Minimum bending radius ≥15x cable diameter.
- Direct Burial/Cable Trench: Must use armored YJV22. Bury at a depth ≥0.8m, with sand bedding and protective covers. Always maintain a minimum separation of 30cm from DC cables to prevent electromagnetic interference.
2. Connection Essentials
- Use proper compression lugs or welding for terminations. Contact resistance should be ≤5mΩ. Never connect copper directly to aluminum (galvanic corrosion risk).
- For outdoor joints/junctions: Use IP65 or higher-rated waterproof enclosures for complete moisture sealing.
3. Protection Requirements
- Route cables away from heat sources, sharp edges, and corrosive substances.
- For dense cabling or installations inside industrial buildings, opt for WDZ-YJV (LSZH) cables to enhance fire safety.
Conclusion: The Right Cable for the Right Job
The YJV 95mm² cable is the robust, high-capacity artery that efficiently carries consolidated solar power from the inverters toward the grid. Its application is precisely defined and limited to the AC side. Using it correctly—and avoiding its misuse on the DC side—is a hallmark of professional plant design. For projects demanding reliable power collection, trust in certified, high-quality cables from JZD Cable.
Designing a utility-scale or C&I solar project? Ensure your AC collection system is built on a reliable foundation. Explore our range of power cables and get expert consultation at .
