With the accelerating global energy transition, solar PV projects are rapidly expanding across the Americas. From cold regions in Canada and the northern United States to high-altitude areas in South America, solar power plants often face extremely low temperatures. In these harsh environments, cables-being the core component for electricity transmission-must demonstrate excellent cold resistance, UV resistance, moisture resistance, and long-term durability.
Among the various North American-standard wires, XHHW-2 wire stands out for its excellent insulation and environmental adaptability, making it a preferred choice for cold-weather solar projects. But is XHHW-2 really suitable for solar projects across cold regions in the Americas? How does it compare to other commonly used wires, such as THWN-2? This article provides a detailed technical and market-oriented analysis.
What is XHHW-2 Wire?
1.Standard Definition
XHHW-2 is a wire with cross-linked polyethylene (XLPE) insulation and is widely recognized under UL certification.
Name breakdown:
- X: Cross-linked polyethylene insulation;
- HH: High heat resistance (90°C);
- W: Moisture-resistant;
- -2: Rated for wet and dry conditions at 90°C continuous operation.
2.Key Features
- Wide temperature range: Maintains flexibility even at -40°C without cracking.
- Weather-resistant: UV resistant and moisture-proof, suitable for outdoor long-term installations.
- Stable electrical performance: Excellent dielectric properties suitable for DC and AC transmission.
3.Applicable Standards
- Complies with UL 44;
- Typical voltage ratings: 600V (standard) and 1000V (optional);
- Widely used in buildings, solar PV, industrial facilities, and public infrastructure.
XHHW-2 Wire Specifications and Usage Scenarios
1.Specifications:
- Voltage rating: 600V and 1000V
- Conductor material: Copper or aluminum
- Wire gauges: 12 AWG to 1/0 AWG (various sizes depending on current requirements)
- Temperature rating: -40°C to 90°C continuous operation
- Insulation: XLPE, moisture and UV resistant
2.Usage Scenarios:
- Utility-scale solar farms: As DC and AC transmission cables in northern U.S., Canada, and South American high-altitude solar farms
- Commercial rooftop solar systems: Outdoor installations meeting UL certification
- Industrial facilities & airports: High-reliability power transmission
- Long-term outdoor projects: Direct burial, conduit, or tray installations
Cold-Weather Requirements for Solar Cables
Many solar projects in the Americas are located in regions with harsh climates:
- Canada & Alaska: Extreme winters with temperatures down to -40°C.
- Northern U.S. (Minnesota, Wisconsin): Long periods of snow and ice.
- Andean Highlands, Chile: Large day-night temperature variations and strong UV exposure.
Under these conditions, cables must meet the following requirements:
1.Low-temperature flexibility: Avoid brittleness during installation and operation.
2.UV resistance: Withstand high-altitude or desert sunlight exposure.
3.Moisture and aging resistance: Long-term durability in buried or outdoor installations.
4.Long lifespan: Minimum 25-year service life to match solar plant investment cycles.
XHHW-2 Wire Installation Guidelines
- Conduit installation: Ensure proper conduit fill according to NEC/UL standards to avoid overheating
- Direct burial: Use protective sleeves or HDPE conduits for mechanical protection
- Tray installation: Maintain minimum bending radius as per manufacturer's specification (usually 8–12 times the cable diameter)
- Outdoor rooftop: Secure cable to racks using UV-resistant ties; avoid tight bends
- Temperature handling: Avoid pulling cable at temperatures below -10°C without proper lubrication or handling method
XHHW-2 Wire Installation Considerations
- Minimum bending radius: Prevent cable damage; follow UL/NEC requirements
- Avoid mechanical stress: Do not drag over sharp edges
- Environmental protection: Protect from prolonged UV exposure during storage before installation
- Conductor compatibility: Copper or aluminum conductors must match connectors and splices
- Segregation: Avoid co-laying with high-voltage or heat-generating cables unless adequately insulated
Advantages of XHHW-2 in Cold-Weather Solar Projects
1.Superior Low-Temperature Performance
- XLPE insulation enables XHHW-2 to remain stable at -40°C.
- Unlike some PVC-insulated wires, it does not become brittle in extreme cold.
2.Excellent Moisture and Weather Resistance
- Suitable for direct burial, conduit, or tray installations.
- Performs reliably in rain, snow, and ice environments.
3.Safety and Compliance
- UL certified, meeting the standards required for the Americas.
- Approved for residential, commercial, and solar PV applications.
4.Comparison with THWN-2
| Feature | XHHW-2 | THWN-2 |
|---|---|---|
| Insulation | XLPE | PVC/Nylon |
| Temperature Range | -40°C to 90°C | Approx. -10°C to 90°C |
| Weather Resistance | Excellent (UV/moisture) | Moderate |
| Lifespan | 25+ years | 15-20 years |
| Suitable Environments | Outdoor/Burial/Cold Climate | Indoor/General Outdoor |
Summary: XHHW-2 provides better low-temperature flexibility, longer lifespan, and stronger weather resistance than THWN-2, making it ideal for cold-weather solar applications.
Typical Applications of XHHW-2 Wire
1.Utility-scale Solar Farms
- Used for DC and AC transmission in northern U.S. and South American high-altitude solar farms.
2.Commercial Rooftop Solar Systems
- Meets outdoor and UL certification requirements for distributed solar installations in urban areas.
3.Industrial Facilities & Airports
- High-reliability power transmission applications.
4.Long-Term Outdoor Projects
- Conduit, tray, or direct burial installations for reliable energy delivery.
Considerations When Selecting XHHW-2
1.Voltage Rating: Confirm 600V or 1000V based on project needs.
2.Conductor Material: Copper or aluminum depending on cost and application.
3.Wire Gauge: Calculated according to solar array current and power.
4.Installation Method: Choose appropriate type for burial, conduit, or solar mounting structures.
Our XHHW-2 Wire Advantages
1. Product Advantages
- We specialize in UL wires and cables, including THHN, THW, MC Cable, and AC Cable. Customers can explore our full UL wire product line.
2. Americas Market Compliance
- All products meet UL certification and American standards.
3. Complete Specifications
- Full coverage of common models, 600V–1000V options available.
4. Fast Delivery
- Quick shipment, supporting both small and large orders.
5. Service Advantage
- Professional technical support, seamless pre-sales and after-sales service.
6. International Cooperation
- Years of manufacturing and export experience, with global partners.
7. UL Certification
- All cables are UL certified for safety and compliance.
8. Customization Options
- Full customization available: materials, specifications, length, color, performance, marking, and packaging.
Contact
For cold-weather solar projects across the Americas, XHHW-2 wire is a reliable choice that balances safety, durability, and cost-effectiveness.
If you are looking for a dependable cable supplier, contact us:
Dongguan Greater Wire & Cable Co., Ltd.
📞 Tel/WhatsApp/Wechat: +86 135 1078 4550 / +86 136 6257 9592
📧 Email: manager01@greaterwire.com