1. Understanding XHHW: Definition and Core Features
What Does XHHW Stand For?
XHHW is an acronym for:
X: Cross-linked polyethylene (XLPE) insulation.
H: Heat-resistant (up to 90°C in wet/dry locations).
H: High heat-resistant (up to 90°C).
W: Water-resistant.
This thermoset-insulated cable is UL 44-certified and designed for power distribution in commercial, industrial, and residential settings. Its XLPE insulation provides superior resistance to abrasion, moisture, heat, and sunlight, making it ideal for both indoor and outdoor use.
Key Properties of XHHW Cable
Voltage Rating: 600V or 2000V, depending on the variant.
Temperature Range:
XHHW: 90°C in dry locations, 75°C in wet locations.
XHHW-2: Rated for 90°C in both wet and dry environments.
Conductor Materials: Available in copper (for superior conductivity) or aluminum (for cost efficiency).
Applications: Conduit installations, underground service entrances, and direct burial (for XHHW-2).
2. XHHW-2 Direct Burial: Underground Power Solutions
XHHW-2 is an enhanced variant of XHHW, certified for direct burial without additional conduit protection. Its cross-linked polyethylene insulation resists environmental stressors, including soil acidity, moisture, and temperature fluctuations.
Technical Specifications for Direct Burial Applications
Voltage: 600V.
Conductor Options: Aluminum (e.g., 4/0 AWG) or copper.
Standards Compliance: UL 44, UL 854, and National Electrical Code (NEC) for underground use.
Key Use Cases:
Solar farm installations.
Underground service entrance cables.
Industrial power distribution networks.
For example, 4/0 AWG Aluminum XHHW-2 Direct Burial Cable (rated 205A, 600V) is widely used in commercial projects due to its cost-effectiveness and durability.
3. XHHW Copper Wire: Performance and Applications
Copper-based XHHW cables are preferred for high-conductivity applications, such as data centers and heavy machinery.
Advantages of Copper Conductors
Higher Ampacity: Copper offers better current-carrying capacity than aluminum (e.g., 1AWG copper XHHW supports 145A at 600V).
Corrosion Resistance: Ideal for humid or chemically aggressive environments.
Flexibility: Easier to install in tight spaces compared to aluminum.
Example: 1AWG XHHW Copper Wire
Voltage: 600V (some variants support 1000V for specialized applications).
Insulation: XLPE for heat resistance.
Applications: Building wiring, HVAC systems, and industrial equipment.
4. XHHW Tray Cable: Industrial and Commercial Use
XHHW tray cable (TC-ER) is designed for use in cable trays, offering flexibility and fire resistance.
Key Features of Tray Cable
Fire Resistance: Flame-retardant XLPE insulation meets NEC Article 392 standards.
Voltage Rating: Up to 2000V for high-power applications.
Installation Flexibility: Suitable for exposed runs in industrial facilities.
For instance, 4AWG XHHW tray cable is commonly used in manufacturing plants for motor controls and machinery power supply.
5. Technical Specifications: 1AWG and 4AWG XHHW
1AWG XHHW 1000V
While standard XHHW is rated for 600V, some manufacturers offer 1000V variants for high-voltage applications. These cables feature thicker insulation and are UL-tested for safety.
4AWG XHHW
Conductor: 7-strand copper or aluminum.
Insulation Thickness: 1.14mm (UL 44-compliant).
Applications: Residential service panels, commercial distribution boards.
6. Compliance and Certification
XHHW cables adhere to:
UL 44: Standard for Thermoset-Insulated Wires and Cables.
NEC Article 310: Guidelines for conductor ampacity and installation.
RoHS Compliance: Ensures environmental safety.
7. Choosing the Right XHHW Cable: A Buyer's Guide
Conductor Material: Copper for high conductivity; aluminum for budget-friendly projects.
Voltage Requirements: Select 600V or 2000V based on application needs.
Environmental Conditions: Opt for XHHW-2 for direct burial or humid environments.
Certifications: Verify UL and NEC compliance.
Dongguan Greater Wire & Cable Co., Ltd. provides high-quality XHHW WIRE and MC CABLE, which are UL certified (UL44, UL66, UL1063, UL1277, etc.) and can be used in high humidity, high temperature, and high-intensity load environments. Our cables have high durability, excellent mechanical properties, and super anti-interference capabilities, and are widely used in commercial, industrial, infrastructure, and residential projects. We have the world's leading production technology and a 50,000 square meter modern factory to ensure efficient production and stable supply. We offer competitive prices and professional customization services to help you improve your market competitiveness! Welcome to consult for a quote!