Copper vs Aluminum Alloy Cable: A Cost Comparison for Large Projects
Created on 06.05
If you are managing a large wiring project — a housing development, a solar farm, or an industrial facility — you have probably noticed copper prices have been high and unstable.
Aluminum alloy cable (AA-8000 series) is not new. It has been used in North America for over 40 years. But many buyers still have questions.
This guide explains what aluminum alloy cable actually is, when it makes sense to use it, and what to watch out for.
First: Aluminum Alloy is NOT Pure Aluminum
This is the most important thing to understand.
Pure aluminum (used in old overhead transmission lines) has three problems:
- Soft and prone to
creep (slow deformation under pressure)
- Brittle and breaks easily when bent
- Terminals loosen over time, creating heat and fire risk
Aluminum alloy (AA-8000 series) solves these problems. It adds iron, copper, silicon, and magnesium to the aluminum. The result:
Property | Pure Aluminum | AA-8000 Series Alloy |
Creep resistance | Poor | Good (comparable to copper) |
Flexibility | Poor | Good — can be bent without cracking |
Termination stability | Loosens over time | Stable with proper lugs |
Conductivity (% of copper) | 61% | 61% (same — alloying does not change conductivity much) |
*The AA-8000 series is the only aluminum alloy approved for building wire in the US National Electrical Code (NEC).*
Why Consider Aluminum Alloy Cable?
Two main reasons.
1. Cost
Aluminum alloy currently costs roughly half as much as copper for the same ampacity (current-carrying capacity).
Why? Because aluminum is lighter, and you need less of it to carry the same current.
Comparison (same ampacity) | Copper | Aluminum Alloy |
Conductor size required | 1x | 1.6x (approx) |
Weight | Heavy | Lighter |
Material cost per meter | Higher | Lower |
For a large project — thousands of meters of cable — the savings can be significant.
2. Weight
Aluminum alloy weighs about one-third as much as copper for the same ampacity.
This matters for:
- Overhead installations
(less sag, easier to handle)
- Long vertical risers
(less strain on supports)
- Shipping
(lower freight cost)
- Installation
(fewer workers needed to pull the cable)
Where Aluminum Alloy Cable is Commonly Used
Application | Suitability | Notes |
Large residential developments | Good | Feeder cables from transformer to distribution panels |
Solar farms | Good | Long DC runs — weight and cost savings add up |
Industrial plants | Good | Feeder cables where space is not tight |
Commercial buildings | Good | Feeders and sub-feeders |
Control panels | Not recommended | Small wires (under 8 AWG) — copper is better |
Portable / reeling cables | Not recommended | Aluminum is less fatigue-resistant than copper |
General rule: For fixed installation (not moving), 8 AWG and larger — aluminum alloy is a viable option.
The One Thing You Must Get Right: Terminations
Most failures of aluminum alloy cable happen at terminations — not because the cable is bad, but because installers use the wrong lugs or skip the correct procedure.
Requirements for safe termination:
Requirement | Why |
CO/ALR rated lugs | Standard copper lugs are not compatible |
Antioxidant compound | Prevents oxidation at the connection |
Correct torque | Over-tightening cracks the conductor; under-tightening causes creep |
No mixing | Do not connect aluminum alloy directly to copper without proper bi-metallic connectors |
If your electrician has never worked with aluminum alloy before, ask them to review the NEC or local guidelines first.
Quick Comparison: When to Choose Which
Factor | Copper | Aluminum Alloy |
Material cost | Higher | Lower (about 50% less) |
Weight | Heavier | Lighter (about 1/3 the weight) |
Installation labor | Standard | Similar — terminations take slightly more care |
Termination complexity | Simple | Requires special lugs and compound |
Flexibility | Good | Good (with alloy, not pure) |
Small sizes (under 8 AWG) | Yes | No |
Moving / flexing applications | Yes | No |
What We Can Supply
We manufacture AA-8000 series aluminum alloy cable for fixed installation applications.
Specification | Details |
Conductor | AA-8000 series aluminum alloy (fully annealed) |
Insulation | XLPE (cross-linked polyethylene) or PVC |
Voltage rating | 0.6/1kV, 8.7/15kV, 26/35kV |
Standards | Designed to ASTM B800 / B801 (AA-8000 specification) |
Sizes available | 8 AWG to 1000 kcmil |
Core configuration | Single core, 3 core, 4 core (as required) |
We are a new exporter. We offer competitive pricing, clear communication, and samples for your testing.
Recommended First Step: Order a Small Sample
Before ordering a full container of aluminum alloy cable, we recommend:
- Request a sample
(50–100 meters of your required size)
- Test termination
with your local electrician using CO/ALR lugs
- Check torque stability
after 24 hours and again after 1 week
Sample orders ship within 7–10 days. Full production: 20–25 days after sample approval.
Contact
Please feel free to leave a message, and we will provide you with one-to-one assistance.