1. What is XHHW-2?
XHHW-2 stands for Cross-linked High Heat and Water-resistant, Version 2. It is an electrical cable with thermoset XLPE (cross-linked polyethylene) insulation, offering superior resistance to heat, water, and physical stress. XHHW-2 is approved for dry and wet locations and is widely used in conduit systems and underground (xhhw 2 underground) applications.
Key Features:
Rated for 600V, 1,000V, or 2,000V systems
Designed for 90°C operation in both dry and wet conditions
Available in copper or aluminum conductors
Complies with UL 44 and NEC Article 310
2. XHHW-2 Cable Voltage Rating
The voltage rating is one of the most critical specifications in the xhhw 2 wire specification. It defines the maximum electrical pressure the cable can withstand:
Standard Voltage Ratings: 600V, 1,000V, or 2,000V
Common Applications:
600V: Residential and light commercial wiring
1kV–2kV: Industrial power distribution and transformer feeds
XHHW-2's voltage rating must align with UL and NEC safety standards (such as NEC 310.10), ensuring safe operation in both enclosed conduit and xhhw 2 underground applications.
3. XHHW-2 Cable Temperature Rating
The temperature rating defines the cable's capacity to maintain performance under thermal stress.
| Environment | XHHW-2 Temperature Rating |
|---|---|
| Dry Locations | 90°C |
| Wet Locations | 90°C |
| Ambient/Underground | Stable up to 90°C |
Compared to standard XHHW, XHHW-2 offers a consistent 90°C rating in both dry and wet environments, enhancing safety and longevity in underground (xhhw 2 underground) and outdoor installations.
4. XHHW-2 Conductor and Ampacity: Copper vs. Aluminum
XHHW-2 is available in copper (xhhw 2 copper wire) and aluminum options. Copper offers superior conductivity and flexibility, making it ideal for high-performance systems.
Ampacity Table (90°C Rating):
| Size (AWG/kcmil) | Copper Ampacity | Aluminum Ampacity |
|---|---|---|
| 2 AWG | 115A | 90A |
| 1/0 AWG | 150A | 120A |
| 4/0 AWG | 230A | 180A |
Example – Underground Use:
In a residential subdivision project, 4/0 AWG XHHW-2 copper wire was installed in 3-ft-deep PVC conduit to supply power to multiple buildings. The cable maintained voltage integrity and safe current capacity despite long-distance runs and high ambient temperatures.
5. XHHW-2 Mechanical & Environmental Ratings
The xhhw 2 wire specification outlines robust mechanical and environmental resistance:
UV Resistant – Suitable for outdoor exposure
Moisture Resistant – Ideal for underground conduits and wet environments
Abrasion Resistant – For heavy-duty industrial use
Flexible Construction – Easier to install through conduit
Case Study:
A port logistics warehouse utilized 1/0 AWG xhhw 2 copper wire in both outdoor trays and xhhw 2 underground ducts. The UV and moisture resistance ensured a long service life in the coastal climate.
6. XHHW-2 Wire Specification Overview
The xhhw 2 wire specification covers critical technical properties:
Conductor Material: Stranded copper (Class B) or compact aluminum
Insulation: Cross-linked polyethylene (XLPE)
Voltage Rating: 600V / 1,000V / 2,000V
Temperature Rating: 90°C in dry and wet locations
Minimum Bending Radius: Typically 7x cable outer diameter
Certifications: UL Listed, CSA, RoHS Compliant, NEC 310
Other elements like weight, diameter, color code, and installation temperature range are also included in detailed product sheets for procurement or design documentation.
7. XHHW-2 vs Other Cable Types
XHHW-2 vs THHN
| Feature | XHHW-2 | THHN |
|---|---|---|
| Dry Temp Rating | 90°C | 105°C |
| Wet Temp Rating | 90°C | 75°C |
| Underground Rated | Yes (xhhw 2 underground) | No (conduit required) |
| Insulation | XLPE | Nylon over PVC |
XHHW-2 vs USE-2 / RHW-2 / RWU90
XHHW-2 vs USE-2: XHHW-2 offers better flexibility and conduit compatibility
XHHW-2 vs RHW-2/RWU90: Similar wet-location ratings, but XHHW-2 is easier to handle during installation
8. Applications and Installation Guidelines: xhhw 2 underground & More
Typical Uses:
Commercial and industrial power distribution
Subpanel feeder circuits
Service entrance conductors
xhhw 2 underground duct banks or PVC conduit systems
Installation Tips:
Use approved conduit for underground installations
Follow minimum bending radius rules
Apply derating for multiple cables in conduit
9. Common Questions About XHHW-2 Cable
Q1: What is the difference between XHHW and XHHW-2?
A: XHHW-2 is rated for 90°C in both wet and dry locations; XHHW is only rated for 75°C in wet locations.
Q2: Is XHHW-2 copper wire suitable for 2,000V applications?
A: Yes, certain xhhw 2 copper wire products are UL-rated up to 2,000V for industrial use.
Q3: Can XHHW-2 be installed underground?
A: Yes, XHHW-2 is UL-approved for xhhw 2 underground use when installed in appropriate conduit.
Q4: What details are included in the xhhw 2 wire specification?
A: Voltage rating, insulation type, conductor material, UL listings, ampacity, and physical dimensions.
Dongguan Greater Wire & Cable Co., Ltd. has been deeply involved in the cable manufacturing field for many years and has formed a rich product line: from common PVC cables to excellent performance cross-linked cables, weather-resistant rubber cables, and silicone cables with stable output in high temperature environments, covering engineering, medical, aviation and other industries. We not only pay attention to every process of the product, but also care about every need of our customers. Choosing Greater means choosing the guarantee of quality, efficiency and professionalism. Contact us now to get the ideal cable solution for your project.