Copper vs Aluminum for Service Entrance
Copper Service vs Aluminum Service
| Feature | Copper Service | Aluminum Service |
|---|---|---|
| 200A conductor | 2/0 AWG | 4/0 AWG |
| 200A cost (per ft) | $4.50-7.00 | $1.50-3.00 |
| Weight | Heavier | 60% lighter |
| Conductivity | Higher (smaller wire) | Lower (larger wire, but cheaper) |
| Termination | Works with all equipment | Requires AL-rated lugs |
| Anti-oxidant | Not required | Required at all connections |
| Expansion | Minimal | Higher thermal expansion |
| Industry standard | Branch circuits | Service entrance and feeders |
| NEC compliance | Always compliant | Compliant with proper installation |
When to use Copper Service
Copper is technically superior in conductivity, corrosion resistance, and ease of termination. For service entrance conductors, copper allows smaller wire sizes (2/0 for 200A vs 4/0 for aluminum), which can matter in tight conduit runs. Copper does not require anti-oxidant compound and does not suffer from thermal expansion issues at terminations.
However, for service entrance and feeder applications, copper's advantages are outweighed by its significantly higher cost. Copper is the standard for branch circuits (14 AWG through 6 AWG) where the cost difference per foot is small and the smaller wire size makes installation easier.
When to use Aluminum Service
Aluminum is the overwhelming industry standard for service entrance conductors, feeders, and any conductor larger than 6 AWG. The cost savings are substantial - at 200A, a 30-foot run of 4/0 aluminum costs $45-90, compared to $135-210 for 2/0 copper. For a 200A residential service, aluminum is used by over 90% of electricians.
The key requirements for aluminum: apply anti-oxidant (Noalox or equivalent) at every connection, torque lugs to manufacturer specifications, and ensure all equipment is AL-rated (CU/AL listed). Modern aluminum alloy conductors (AA-8000 series per NEC 310.14) have largely solved the expansion and creep issues that plagued older aluminum wiring in the 1960s-70s.
On the job
A 200A service upgrade requires new service entrance conductors from the meter to the panel - typically 20-40 feet. Using copper 2/0 AWG: $90-280 for the wire alone. Using aluminum 4/0 AWG: $30-120.
The aluminum requires a larger conduit (4/0 AWG is physically bigger), but the material savings of $60-160 more than offset the slightly larger conduit cost ($10-20 more). Every inspector will find aluminum service entrance conductors perfectly normal - it is the standard practice.
Cost comparison
The copper-to-aluminum cost ratio increases dramatically at larger sizes. At 12 AWG (branch circuit), copper is only $0.05-0.10/ft more than aluminum - negligible. At 4/0 AWG (200A feeder), copper costs 2-3x more than aluminum.
At 250 kcmil and above, copper can cost 3-4x more. This is why commercial and industrial feeders are almost exclusively aluminum.
InstallationInstallation difficulty
Licensed electrician required for service work.
Same - plus anti-oxidant and AL-rated lugs.
Aluminum requires three additional steps compared to copper: (1) apply anti-oxidant compound (Noalox, Penetrox, or equivalent) to all terminations, (2) verify all lugs and equipment are AL-rated (stamped CU/AL or AL-CU), and (3) torque all connections to manufacturer specifications with a calibrated torque wrench. Under-torqued aluminum connections can loosen over time due to thermal expansion and creep, creating hot spots and potential fire hazards. This is not optional - proper torque is critical for aluminum conductor safety.
Related guides
External resourcesTrusted references
Frequently asked questions
Which is better, copper service or aluminum service?
Neither is universally better - each has specific strengths for different situations. Aluminum is the industry standard for service entrance and feeder conductors. At 200A, aluminum saves $300-600 on a typical 30-foot run. Use copper for branch circuits (smaller sizes where cost difference is minimal). Always apply anti-oxidant to aluminum connections and ensure equipment is AL-rated.
Can I use copper service and aluminum service in the same installation?
Yes, many installations use both where each is best suited. Transition points must be properly connected per NEC requirements. Always ensure the transition is accessible and properly identified.
What does the NEC say about copper service vs aluminum service?
The NEC specifies where each is permitted and prohibited. Check the specific NEC articles referenced in the comparison table above. Your local jurisdiction may have amendments that further restrict or modify these requirements.
Do I need a permit for this electrical work?
In most jurisdictions, any new circuit or wiring change requires a permit and inspection. Check our state-by-state permit guide for your specific requirements. Working without a permit can void insurance and create liability issues.
Is aluminum wiring safe?
Modern aluminum alloy conductors (AA-8000 series) used for service entrance and feeders are safe when properly installed. The problems associated with 1960s-70s aluminum branch circuit wiring (using the older AA-1350 alloy in 15A/20A circuits) do not apply to modern service entrance conductors. The NEC specifically approves aluminum for feeders and services. The key is proper termination: anti-oxidant, AL-rated equipment, and correct torque.
Can I mix copper and aluminum in the same circuit?
You can transition between copper and aluminum using listed connectors (such as Polaris or split-bolt connectors rated CU/AL). Apply anti-oxidant to the aluminum side. Direct contact between bare copper and bare aluminum without a proper connector will cause galvanic corrosion. Never use a wire nut to connect copper to aluminum - use a connector specifically listed for the purpose.
NEC 2023 references verified April 2026