With the rapid development of the global photovoltaic (PV) industry, the demand for high-performance cables in PV systems has increased significantly. RHW-2 cables have emerged as a preferred choice due to their excellent heat resistance, moisture resistance, and weather durability. They play a critical role in ensuring stable current transmission and system safety in solar PV installations.
In PV projects, cables not only carry electrical power but also provide essential safety, aging resistance, and long-term weather endurance. Therefore, understanding the key electrical performance parameters of RHW-2 cables is vital for engineering design, selection, and maintenance. This article provides a detailed analysis of RHW-2 cable performance and compares it with XHHW-2 cables, helping PV project engineers make informed decisions.
RHW-2 Cable Structure and Materials
RHW-2 cables are composed of the following layers:
1.Conductor: High-conductivity copper ensures low resistance and high current-carrying capacity for long-term stable power transmission.
2.Insulation: Cross-linked polyethylene (XLPE) or thermoplastic PVC insulation with a temperature rating up to 90℃, providing excellent moisture resistance suitable for outdoor PV applications.
3.Sheath: Various sheath materials provide UV resistance, abrasion resistance, and chemical resistance.
This design ensures that RHW-2 cables offer high safety, durability, and ease of installation in photovoltaic systems.
Electrical Performance Parameters
Rated Voltage and Current
- Rated Voltage: RHW-2 cables typically support 600V/1000V, accommodating both DC and AC circuits in PV systems.
- Current Capacity: Depending on conductor size, RHW-2 cables carry from 10A to several hundred amperes, suitable for modules, inverters, and combiner boxes.
Temperature Tolerance
- RHW-2 cables can operate continuously at 90℃ and withstand short-term spikes up to 120℃ without performance degradation, making them ideal for rooftop PV systems and high-temperature environments.
Moisture and Humidity Resistance
- RHW-2 cables offer superior moisture and water resistance, maintaining insulation integrity even in wet conditions.
- Compared to traditional THW or RHH cables, RHW-2 maintains higher insulation resistance in humid environments, reducing leakage current risks.
UV and Outdoor Weather Resistance
- The RHW-2 outer sheath provides excellent UV resistance, making it suitable for long-term outdoor exposure. Compared to XHHW-2 cables, RHW-2 ages slower under strong sunlight and high temperatures, extending service life.
Flame Retardancy
- RHW-2 cables meet UL 1581 flame-retardant standards, adding an extra layer of safety for inverters, combiner boxes, and other critical PV components.
RHW-2 vs. XHHW-2 Cable Comparison
| Feature | RHW-2 | XHHW-2 |
|---|---|---|
| Rated Temperature | 90℃ | 90℃ |
| Moisture Resistance | Excellent | Good |
| UV Resistance | High | High |
| Flame Retardancy | UL Standard | UL Standard |
| Flexibility | Moderate, easy to install | High, ideal for rooftop wiring |
| Typical Applications | PV module interconnections, combiner box wiring | Rooftop wiring, DC circuits, underground installations |
The comparison shows that RHW-2 is more suitable for humid, long-term outdoor, and high-safety PV applications, while XHHW-2 is better suited for high-flexibility scenarios requiring easy installation.
RHW-2 Cable Specifications and Typical Applications
| Conductor Size (mm²) | Rated Current (A) | Typical Application |
|---|---|---|
| 10 | 50 | Short-distance module interconnection |
| 16 | 70 | Small rooftop PV wiring |
| 25 | 95 | Combiner box to inverter supply |
| 35 | 125 | Large-scale PV DC main lines |
| 50 | 155 | High-current industrial PV installations |
Selecting the appropriate size ensures a safe, efficient, and cost-effective PV wiring solution.
RHW-2 Cable Installation Guidelines
1.Bending Radius: Follow the minimum bending radius relative to conductor diameter to prevent conductor damage.
2.Fixing Methods: Use appropriate clamps or brackets for rooftop or support structure wiring to prevent sheath wear due to vibration.
3.Termination: Use proper crimping or terminal connections to ensure long-term electrical reliability.
4.UV Protection: For prolonged sunlight exposure, consider additional shielding or UV-resistant conduit.
Outstanding Product Advantages
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Comprehensive UL Cable Manufacturing
We provide a wide range of products, including THHN, THW, MC cable, AC cable, and more, fulfilling various PV and industrial wiring needs. Detailed product information is available on our UL wire page.
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Fully Compliant with North American Standards
RHW-2 cables meet UL certification and North American electrical code requirements, ensuring smooth acceptance for import projects.
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Full Range of Specifications
Various conductor sizes and voltage ratings are available to meet different PV system current requirements.
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Fast Delivery for Any Order Size
Whether for small rooftop projects or large-scale PV plants, we offer timely shipping to ensure project schedules are maintained.
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Professional Technical Support
We provide guidance on wiring design, cable selection, installation training, and after-sales support, helping clients reduce maintenance risks.
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Extensive International Cooperation Experience
With years of manufacturing and export experience, our partners are worldwide, ensuring stable supply and responsive service.
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UL-Certified Cables
All products are UL-certified, reliable for various PV and industrial wiring projects.
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Flexible Customization Options
We offer customization for materials, specifications, lengths, colors, performance, markings, and packaging to meet personalized customer requirements.
Contact Us
Dongguan Greater Wire & Cable Co., Ltd.
- Tel/WhatsApp/Wechat: +86 135 1078 4550 / +86 136 6257 9592
- Email: manager01@greaterwire.com