Copper prices have been climbing. Project budgets are under pressure. And yet, the demand for new commercial and industrial buildings continues to grow. For many project buyers and contractors, the question is no longer "should we consider aluminum?" but "why haven't we switched yet?"
Aluminum XHHW-2 wire offers a compelling alternative to copper for building power systems. It costs less, weighs less, and when properly specified and installed, delivers reliable performance over decades of service.
This article covers the features, benefits, and considerations of aluminum XHHW-2 wire, helping you decide if it is the right choice for your next project.
1. What Is Aluminum XHHW-2 Wire?
Aluminum XHHW-2 wire is a building wire with an aluminum conductor and XLPE (cross-linked polyethylene) thermoset insulation. It is certified under UL 44 and rated for 90°C in both dry and wet locations.
The aluminum conductor is typically 8000-series alloy, which is specifically formulated for electrical applications. This alloy offers improved conductivity, better creep resistance, and greater flexibility compared to earlier aluminum conductor materials.
Like its copper counterpart, aluminum XHHW-2 is designed for installation in conduit, cable trays, and other approved raceways. It is suitable for feeders, branch circuits, and service entrance applications in commercial and industrial buildings.
2. Why Choose Aluminum XHHW-2 Wire?
Three factors drive the choice of aluminum XHHW-2 wire.
- Cost savings. This is the most obvious advantage. Aluminum costs significantly less than copper per pound. For large projects with substantial conductor quantities, the savings can be substantial. A 500 kcmil aluminum XHHW-2 conductor, for example, delivers the ampacity needed for large feeders at a fraction of the cost of equivalent copper.
- Weight reduction. Aluminum weighs about one-third as much as copper for the same ampacity. This translates to lower shipping costs, easier handling on site, and lower labor costs during installation. Crews can pull larger aluminum conductors with less effort than equivalent copper conductors.
- Ampacity-to-cost ratio. When sized appropriately, aluminum XHHW-2 provides a better ampacity-to-cost ratio than copper. An XHHW-2 aluminum wire ampacity chart shows that larger aluminum conductors can carry substantial current at a much lower material cost than copper of the same ampacity.
Aluminum building wire has come a long way. Modern alloys and termination practices have addressed the concerns that once limited its use. Today, aluminum XHHW-2 is a proven, reliable choice for building power systems.
Aluminum XHHW-2 wire is the logical choice for projects where budget matters and copper is not required by code or specification.
3. How Aluminum XHHW-2 Compares to Copper XHHW-2
Understanding the differences between aluminum and copper XHHW-2 helps in making the right selection.
- Ampacity. For the same size conductor, copper has higher ampacity. Aluminum requires a larger conductor to achieve the same ampacity. This is the trade-off for lower material cost.
- Weight. Aluminum is lighter. For large feeders, this makes a significant difference in handling and pulling.
- Cost. Aluminum is substantially less expensive. The price difference varies with market conditions but is consistently significant.
- Termination. Aluminum requires specific termination practices. Proper lugs, anti-oxidant compound, and torque specifications are essential. Modern 8000-series aluminum alloys are more forgiving than earlier alloys.
- Thermal expansion. Aluminum expands and contracts more than copper under temperature changes. Proper terminations and installation practices account for this.
- Corrosion resistance. Aluminum forms a natural oxide layer that protects against further corrosion. This oxide layer is non-conductive, which is why anti-oxidant compounds are used at terminations.
4. Where Is Aluminum XHHW-2 Wire Typically Used?
Aluminum XHHW-2 wire is commonly specified for applications where material cost is a major factor and copper is not mandatory.
- Main feeders in large buildings. For feeders from the service entrance to distribution panels, aluminum XHHW-2 offers significant cost savings over copper. A 350 kcmil aluminum XHHW-2 wire is frequently used for this purpose, providing ample ampacity at a fraction of the cost of copper.
- Service entrance conductors. Utility companies often specify aluminum for service entrance cables. Aluminum XHHW-2 meets this requirement and provides a cost-effective solution for bringing power into buildings.
- Industrial power distribution. Factories and industrial plants with long feeder runs can save substantially by using aluminum XHHW-2. The weight advantage also makes installation easier in large facilities.
- Large commercial projects. Shopping centers, hospitals, schools, and high-rise buildings often use aluminum XHHW-2 for main feeders and sub-feeders.
A 750 kcmil aluminum XHHW-2 wire is commonly used for the largest feeders, carrying heavy loads with manageable installation characteristics. The combination of large conductor size and light weight makes it a practical choice for the biggest power distribution applications.
5. Installation Considerations for Aluminum XHHW-2 Wire
Proper installation is essential for reliable performance. Here are key considerations.
- Use the right lugs. Aluminum wire requires lugs rated for aluminum conductors. These lugs are designed to accommodate the thermal expansion characteristics of aluminum and provide a secure connection.
- Apply anti-oxidant compound. At terminations, apply a compound that prevents oxidation and improves contact. This is a standard practice for aluminum terminations.
- Follow torque specifications. Over-tightening or under-tightening connections is a common cause of aluminum termination failures. Use a torque wrench and follow the lug manufacturer's specifications.
- Size appropriately. Aluminum conductors must be larger than copper for the same ampacity. Use the correct ampacity tables for aluminum, not copper.
- Check the termination temperature rating. Most lugs are rated 60°C or 75°C, not 90°C. The ampacity of aluminum XHHW-2 is limited by the termination rating.
- Inspect regularly. For critical installations, periodic thermal imaging can detect loose connections before they cause problems.
6. Common Concerns About Aluminum XHHW-2
Some specifiers still hesitate to use aluminum wire. Here are the most common concerns and the reality.
"Aluminum wire is unreliable." Early aluminum conductors had issues. Modern 8000-series alloys and improved terminations have solved these problems. Properly installed aluminum wire is reliable.
"Aluminum wire is hard to work with." Aluminum is lighter and more flexible than copper of the same ampacity. It is actually easier to handle in many cases.
"I don't know how to terminate aluminum." The practices are well-documented. Any qualified electrician can learn the proper techniques.
"Inspectors don't like aluminum." Aluminum is code-compliant and widely accepted. Inspectors are familiar with it. Proper terminations address any concerns.
The reality is that aluminum XHHW-2 is a mature, proven product. When specified and installed correctly, it delivers years of reliable service at significant cost savings.
FAQ
Q1: Is aluminum XHHW-2 as reliable as copper?
Yes, when properly installed. Modern 8000-series aluminum alloys and proper termination practices make aluminum wire reliable for building power systems.
Q2: Does aluminum XHHW-2 have the same temperature rating as copper?
Yes. XHHW-2 is rated 90°C in wet and dry locations for both aluminum and copper. Termination temperatures (60°C or 75°C) limit ampacity in both cases.
Q3: Can I terminate aluminum XHHW-2 on standard copper lugs?
No. Aluminum requires lugs rated for aluminum conductors. Using copper-only lugs is a safety hazard and code violation.
Q4: How much can I save by using aluminum instead of copper?
Savings vary with market prices, but aluminum typically costs 40-60% less than copper for the same ampacity. For large projects, the savings can be substantial.
Q5: Does Greater provide UL 44 certified aluminum XHHW-2 wire?
Yes. Dongguan Greater Wire & Cable Co., Ltd. offers UL 44 certified XHHW/XHHW-2 aluminum building wire. We can provide the certificate and file number upon request.
Need Aluminum XHHW-2 Wire for Your Project?
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Dongguan Greater Wire & Cable Co., Ltd.
Tel/WhatsApp/Wechat: +86 136 6257 9592
Tel/WhatsApp/Wechat: +86 135 1078 4550
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Website: www.greaterwire.com