Aluminum wire is widely used in residential, commercial, and utility applications because it is lightweight, cost-effective, and offers good conductivity. While copper remains the standard for many low-voltage circuits, aluminum wiring continues to be the preferred choice for power distribution, overhead lines, and large-gauge installations.
Types of Aluminum Wire
Below are the main types of aluminum wire, how they differ, and where each type is typically used.
1. AAAC – All Aluminum Alloy Conductor
Description:
Made from high-strength aluminum alloy (usually Aluminum-Magnesium-Silicon alloy).
Features:
Stronger than pure aluminum
Excellent corrosion resistance
Lightweight
Common Uses:
Overhead power distribution
Coastal or corrosive environments
Medium and high-voltage transmission
2. AAC – All Aluminum Conductor
Description:
Made of pure aluminum strands.
Features:
Very lightweight
Highly conductive
Easy to install
Common Uses:
Low-voltage overhead distribution
Urban areas with short spans
Applications where weight is important
3. ACSR – Aluminum Conductor Steel Reinforced
Description:
Aluminum strands wrapped around a steel core.
Features:
Very high tensile strength
Long-span capability
Excellent for high-voltage transmission
Common Uses:
Long-distance transmission lines
River crossings, long spans
High mechanical load conditions
4. ACAR – Aluminum Conductor Alloy Reinforced
Description:
Aluminum conductor reinforced with aluminum alloy strands instead of steel.
Features:
Combines high conductivity with better strength
Lighter and more corrosion-resistant than ACSR
Common Uses:
Overhead power distribution
Areas needing higher ampacity and corrosion resistance
5. SER and SEU Aluminum Cable (Service Entrance Cable)
Description:
Stranded aluminum conductors with XLPE or THHN insulation inside a PVC jacket.
Types:
SER — has two hots, a neutral, and a bare ground
SEU — hot conductors wrapped around a bare neutral
Common Uses:
Feeding main panels
Feeding subpanels
Service entrance wiring for homes
6. URD Aluminum Cable (Underground Residential Distribution)
Description:
Used for direct burial or underground service.
Features:
XLPE-insulated aluminum conductors
Used in triplex or quadruplex configurations
Common Uses:
Feeding outdoor buildings
Underground power distribution
Residential transformer-to-panel runs
7. Triplex and Quadruplex Aluminum Overhead Cable
Triplex: Two insulated hots + one bare neutral
Quadruplex: Three insulated conductors + one bare neutral
Features:
Lightweight overhead service drop cables
XLPE insulation
Common Uses:
Overhead service drop from pole to house
Secondary power distribution
8. Aluminum Building Wire (THHN / XHHW-2 Aluminum Conductors)
Description:
Stranded aluminum conductors with THHN or XHHW-2 insulation.
Features:
Used for branch circuits and feeders
Must follow torque and installation requirements
Common Uses:
Panel feeders
Subpanels
Large equipment (HVAC, EV chargers, etc.)
9. Bare Aluminum Wire
Description:
Uninsulated aluminum used for grounding or overhead lines.
Common Uses:
Overhead transmission
Substation grounding
Utility applications
Summary Table
| Type of Aluminum Wire | Strength | Conductivity | Common Use |
|---|---|---|---|
| AAC | Medium | High | Short-span overhead |
| AAAC | High | Medium-high | Distribution in corrosive areas |
| ACSR | Very high | Medium | Long-span transmission |
| ACAR | High | High | Enhanced overhead distribution |
| SER/SEU | Medium | High | Home service entrance |
| URD | Medium | High | Underground power |
| Triplex/Quadruplex | Medium | Medium-high | Service drops |
| THHN/XHHW-2 Aluminum | Medium | High | Building feeders |
| Bare Aluminum | Medium | High | Utility grounding & overhead |
Final Thoughts
Choosing the right type of aluminum wire depends on:
Application (overhead, underground, residential, industrial)
Voltage level
Span length
Environmental conditions
Budget and mechanical strength requirements
If you need help selecting the best aluminum wire for your project, I can also create a full buyer’s guide, comparison chart, or product page content for your TOT Wire & Cable website.
