With the rapid growth of solar energy projects in the Americas, the demand for high-quality, reliable, and certified cables is rising sharply. Among the most frequently used products are those under UL44 certification, including XHHW, RHW, RHW-2, USE-2, THWN-2, and MV-rated cables (MV-90, MV-105). These cables are widely applied across various stages of photovoltaic (PV) systems - from solar modules to the grid connection.
This article provides a complete 5000-word marketing-oriented analysis of UL44 photovoltaic cables, explains their technical characteristics, compares different cable types, and highlights why more and more EPCs in the Americas are choosing Dongguan Greater Wire & Cable Co.,Ltd. as their trusted supplier.
The Role of UL44 Cables in PV Projects
A solar power project typically consists of the following key stages:
- Solar Modules (DC side) → Convert sunlight into electricity.
- Combiner Box → Collects DC outputs from multiple modules.
- Inverter → Converts DC power into AC power.
- Distribution System → Transfers AC power safely.
- Grid Connection Point → Delivers electricity into the utility grid.
At each stage, cables play a critical role in ensuring efficiency, safety, and compliance.
- DC Side Cables: USE-2, PV wire (UL4703), RHW-2.
- AC Side Low-Voltage Cables: XHHW-2, THWN-2.
- Medium Voltage (MV) Transmission Cables: MV-90, MV-105 (5kV, 15kV, 35kV).
Commonly Used UL44 Cables in PV Projects
XHHW / XHHW-2
XLPE insulation
Heat resistance up to 90°C (XHHW) and 90°C wet/105°C dry (XHHW-2)
Commonly used for AC distribution
RHW / RHW-2
XLPE insulation, moisture-resistant
Rated 90°C wet/dry (RHW-2)
Commonly used in underground or outdoor PV installations
USE-2
XLPE insulation, sunlight resistant
Widely used for DC wiring from PV modules to combiner box
THWN-2
PVC insulation + nylon jacket
Wet and dry rated 90°C
Common for conduit installations in inverter and distribution systems
MV-90 and MV-105
MV-90: XLPE insulation rated up to 90°C
MV-105: XLPE insulation rated up to 105°C
Voltage ratings: 5kV, 15kV, 35kV
Applied for medium-voltage connections from inverters to substations
Comparison Table of UL44 PV Cables
| Cable Type | Insulation | Temperature Rating | Typical Application |
|---|---|---|---|
| XHHW / XHHW-2 | XLPE | 90°C / 105°C | AC distribution, conduit wiring |
| RHW / RHW-2 | XLPE | 90°C wet/dry | Underground or outdoor PV |
| USE-2 | XLPE | 90°C | DC wiring (module to combiner) |
| THWN-2 | PVC + Nylon | 90°C wet/dry | Inverter & distribution |
| MV-90 | XLPE | 90°C | Medium voltage circuits |
| MV-105 | XLPE | 105°C | Higher-performance medium voltage |
Cable Applications Across PV System Stages
Solar Modules → Combiner Box
Common Cables: USE-2, PV Wire, RHW-2
Features: Sunlight resistance, high temperature endurance, UV protection.
Combiner Box → Inverter
Common Cables: RHW-2, XHHW-2
Features: High voltage DC/AC transition, moisture resistance.
Inverter → Distribution Panel
Common Cables: THWN-2, XHHW-2
Features: Flexible installation, conduit compatibility.
Distribution → Substation
Common Cables: MV-90, MV-105
Features: Medium voltage ratings, heat resistance, durability.
Substation → Grid Connection Point
Common Cables: MV-105, MV-90
Features: Reliable grid interconnection, long service life.
Why UL44 Cables are Essential for PV Projects in the Americas
- UL Certification: Ensures compliance with North American standards.
- Safety & Durability: Fire-resistant, UV-resistant, moisture-resistant.
- Wide Availability: Compatible with EPC design requirements.
- Long Service Life: Designed for 25+ years of operation.
Why More EPCs Choose Chinese Cable Suppliers
In recent years, EPC companies in the Americas are increasingly turning to Chinese suppliers for UL44 cables. The reasons include:
- Cost Efficiency: Chinese factories offer competitive pricing without compromising quality.
- Full Certification: Products meet UL, CSA, IEC, TUV standards.
- Strong Manufacturing Capacity: Ability to fulfill bulk orders with short lead times.
- Export Expertise: Experience in handling packaging, CIF shipping, and customs clearance.
- Technical Support: Engineering teams provide design consultation and documentation.
Why Choose Dongguan Greater Wire & Cable Co.,Ltd.
At Dongguan Greater Wire & Cable Co.,Ltd., we specialize in providing UL44 certified PV cables for projects across the Americas. Our advantages include:
✅ Complete Product Range: XHHW, RHW-2, USE-2, THWN-2, MV-90, MV-105.
✅ UL, CSA, IEC Certified: Compliance guaranteed.
✅ Competitive Pricing: Direct-from-factory supply.
✅ Reliable Export Packaging: Wooden reels, seaworthy packing.
✅ Fast Lead Time: Rapid production and shipment.
✅ Successful Case Studies: Supplied cables to large-scale PV farms in Latin America, passing third-party inspections and ensuring early delivery.
Contact us today for your PV cable needs!
📞 WhatsApp/Wechat: +86 135 1078 4550 / +86 136 6257 9592
📧 Email: manager01@greaterwire.com
From DC wiring to medium-voltage transmission, UL44 cables such as XHHW, RHW-2, USE-2, THWN-2, MV-90, and MV-105 are indispensable in modern solar projects in the Americas. By selecting a reliable supplier like Dongguan Greater Wire & Cable Co.,Ltd., EPCs can ensure cost efficiency, compliance, and long-term reliability for their photovoltaic systems.
👉 Looking for a one-stop PV cable supplier for your next project? Contact Greater Wire & Cable today and join the growing list of EPCs who trust us for their success!