14 AWG Copper vs Aluminum
At 14 AWG, aluminum wire carries 0% less current than copper but costs roughly 40-60% less per foot and weighs one-third as much. With copper prices rising, 14 AWG aluminum wire is increasingly common for feeders and service entrances where the cost savings are substantial.
Ampacity comparison
All values per NEC 2023 Table 310.16 for THHN insulation with 110.14(C) termination limits applied.
| Property | Copper | Aluminum |
|---|---|---|
| 90°C ampacity | 25A | 0A |
| Usable (after 110.14(C)) | 20A | 0A |
| Breaker | 15A | 0A |
| Conduit (EMT) | 1/2" EMT | - |
When to use each
Use 14 AWG copper when
- You need the full 20A capacity in a single conductor
- Terminal connections are standard (most residential equipment is copper-only rated)
- Space is limited and you need the smallest conduit possible
- Connections will not be accessible for periodic retorquing
What to buy
For 14 AWG branch circuits, buy NM-B (Romex) cable for in-wall runs or THHN conductors for conduit. Copper is standard at this gauge since the cost premium over aluminum is small and most devices are copper-rated only. Buy 10-15% more wire than your measured run length to account for routing and termination tails.
Common products for 14 AWG Copper circuits
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Detailed ampacity: 14 AWG copper. Wire size lookup: 15A circuit.
Frequently asked questions
Is 14 AWG aluminum safe to use?
Aluminum is not commonly available in this gauge.
How much less does 14 AWG aluminum carry than copper?
N/A for this gauge.
What size aluminum equals 14 AWG copper?
To match 14 AWG copper (20A), check the 15A wire size guide for the exact aluminum equivalent needed.
Can I mix copper and aluminum in the same circuit?
Not directly. Copper and aluminum must not touch at connections due to galvanic corrosion. Use approved bimetallic connectors (like Alumiconn) or AL/CU-rated panel lugs.
NEC 2023 references verified April 2026