1. What is RHW-2 Wire?
RHW-2 stands for "Rubber-insulated, Heat- and Water-resistant, 90°C Wet – Version 2." It typically features a copper conductor (rhw 2 copper wire) and cross-linked polyethylene (XLPE) insulation, which ensures high thermal stability and mechanical strength. As a rhw 2 fire rated cable, it complies with key industry safety standards, making it suitable for residential, commercial, industrial, and solar applications-especially in challenging or wet environments.
2. Key Features and Benefits of RHW-2 Wire
High temperature rating: Up to 105°C in dry locations and 90°C in wet locations
Excellent water resistance: Ideal for moist environments and direct burial installations (rhw 2 direct burial)
UV resistance: Safe for outdoor exposure
Flexible construction: Easy to install across various conditions
Flame resistance: UL-listed as a rhw 2 fire rated cable
3. Common Applications of RHW-2 Wire
Case Study 1: Commercial Underground Power Distribution
In a large shopping mall project, engineers used rhw 2 copper wire as the main underground power distribution cable. The high humidity of the area required a durable and water-resistant solution. RHW-2 offered reliable performance and its direct burial capability (rhw 2 direct burial) eliminated the need for extra conduit, reducing installation time and cost.
Case Study 2: Solar Power Plant Wiring
In a desert-based solar farm, RHW-2 fire rated cable was chosen for wiring from photovoltaic modules to inverters. With extreme heat and dust conditions, RHW-2 provided superior thermal endurance and UV resistance, ensuring long-term stability and minimal maintenance costs.
Other typical uses include:
Industrial facility feeders
Residential main electrical panels
Hospitals, telecom equipment, and backup systems
4. RHW-2 Wire vs. Other Common Wire Types
The table below compares RHW-2 wire with other popular wire types such as THHN, XHHW-2, and USE-2 in terms of performance:
| Wire Type | Temp Rating | Water Resistant | Direct Burial | Fire Rated | Recommended Use |
|---|---|---|---|---|---|
| RHW-2 | 105°C | ✅ | ✅ (rhw 2 direct burial) | ✅ (rhw 2 fire rated cable) | Indoor/Outdoor/Underground |
| THHN | 90°C (dry) | ❌ | ❌ | Basic | Indoor dry environments |
| XHHW-2 | 90°C (wet) | ✅ | Limited | Moderate | Indoor / Partial outdoor |
| USE-2 | 90°C | ✅ | ✅ | ❌ | Outdoor / Underground |
Conclusion: If you're looking for a cable that combines fire resistance, waterproofing, heat endurance, and direct burial capacity, RHW-2 wire is your best option.
5. Sizing, Voltage Rating, and Ampacity of RHW-2 Wire
Available sizes: 14 AWG to 1000 kcmil
Voltage rating: Standard 600V, with high-capacity models available
Ampacity: Depends on temperature and installation conditions
For example, 2 AWG RHW-2 copper wire supports up to 115A at 75°C
500 kcmil RHW-2 can handle up to 380A at 90°C
Always refer to NEC (National Electrical Code) tables for exact values.
6. RHW-2 Wire Installation Guidelines
Code Compliance: Must follow NEC Article 310 and local codes
Minimum Bend Radius: Follow manufacturer specs to prevent insulation damage
Typical Installation Methods:
In conduit (metallic or non-metallic)
Direct burial (rhw 2 direct burial) in approved soil
Outdoor exposure (thanks to UV-resistant insulation)
7. Certifications and Compliance of RHW-2 Wire
UL Listed: Meets UL 44 standard for fire resistance (rhw 2 fire rated cable)
CSA Certified: Suitable for Canadian electrical systems
NEC Compliant: Approved for use under NEC Article 310
RoHS Compliant: Free from hazardous substances like lead and cadmium
8. Buying Tips and Cost Considerations for RHW-2 Wire
Determine your needs: Do you require rhw 2 fire rated cable or rhw 2 direct burial capability?
Choose conductor type: Most use rhw 2 copper wire for superior conductivity
Match size and length: Select AWG size based on current load and distance
Dongguan Greater Wire & Cable Co., Ltd. is committed to providing global customers with cable products with complete certifications and stable quality. Our product line has passed a number of international authoritative certifications, including UL, SAA, CE, TUV, VDE, ISO, etc., to ensure that every cable can smoothly enter the target market. We not only provide compliant products, but also provide professional support and full-service. Whether you are an engineering contractor, electrical wholesaler or project developer, welcome to contact us and let us become your partner for steady development.