Most arguments about 2 AWG copper wire come down to which column of the ampacity table somebody read. The conductor itself is settled: 66,360 circular mils of copper, about 33.6 square millimeters, 0.2576 inches across the bare metal. What shifts is how much current it can legally carry, and a 35-amp spread is wide enough to decide whether a feeder passes inspection.
How Many Amps Does 2 AWG Copper Wire Carry?
National Electrical Code Table 310.16 gives 2 AWG copper three ampacities, one for each insulation temperature column, and 115 amps at 75°C is the figure most residential and light commercial work lands on.
| Specification | Value For 2 AWG Copper | Why It Matters |
|---|---|---|
| Bare conductor diameter | 0.2576 in (6.544 mm) | Sets whether it fits a given lug or terminal |
| Conductor area | 66,360 circular mils (about 33.6 mm²) | The baseline every ampacity figure builds from |
| Ampacity, 60°C column | 95 A | The ceiling when gear is rated 60°C |
| Ampacity, 75°C column | 115 A | The number most home feeders land on |
| Ampacity, 90°C column | 130 A | The insulation limit, not a terminal limit |
| Weight, bare tinned solid copper | 0.209 lb/ft | Pulling tension and support spacing |
| Weight, 2 AWG THHN/THWN-2 | 0.254 lb/ft | Conduit fill and shipping weight |
| Weight, 2 AWG XHHW-2 | 204 lb per 1,000 ft copper | Sizing feeder reels and equipment |
| Outside diameter, THHN/THWN-2 | 0.375 in | Cable outside measurement, not conductor size |
Four variables move that figure:
- Insulation rating. The copper is identical at 60°C and 90°C; only the jacket changes.
- Terminal rating. A 130-amp conductor bolted to a 75°C lug becomes a 115-amp circuit.
- Derating. Bundled conductors, hot attics, and crowded conduit all pull the usable amperage down.
- Installation method. Raceway, cable, and free air each get their own column.
Listings often print 115 amps for 2 AWG copper even when the insulation is rated 90°C, because the switchgear at each end is the weaker link. The wire rarely limits the circuit.
That is why a single number quoted without its temperature column tells you nothing useful. The same wire is a 95-amp conductor or a 130-amp conductor depending on what sits at each end. The full Cerrowire ampacity charts show where 2 AWG falls against the other copper sizes.
2 AWG Copper Wire Diameter And Weight: What Changes By Product
The gauge fixes the conductor, not the finished product. Bare 2 AWG copper measures 0.2576 inches across, but the same metal under THHN insulation measures about 0.375 inches outside diameter.
Weight follows the same pattern.
Strand count explains the rest of the gap. A 7-strand conductor is stiffer and suits long feeder runs; a 19-strand conductor bends more easily inside conduit and tighter panel spaces.
The mix-up to avoid: conductor diameter is not cable outside diameter. Conduit fill math runs on the finished cable’s outside measurement, and that changes with insulation type even when the gauge never moves. If you are ordering, our tested roundup of 2 AWG copper wire sorts the constructions by where each one fits.
Where 2 AWG Copper Gets Used, And What To Confirm Before Ordering
2 AWG copper is a standard pick for 100-amp subpanel feeders and large motor circuits, and it appears in service entrance conductors on smaller residential services.
The size works because 115 amps at 75°C leaves headroom above a 100-amp load without jumping to a larger, pricier gauge. Aluminum is the other path — the same gauge in aluminum carries less current, which is why the ampacity tables keep separate aluminum columns. Fewer strands and a larger overall diameter come with it, and aluminum terminations also need an antioxidant compound and lugs listed for the metal.
One thing decides your number: the temperature rating printed on the breaker, lug, or panel. If that gear is rated 60°C, plan on 95 amps and size up rather than argue with the label.
- Confirm which temperature column you are using, and match it to the rating stamped on the termination.
- Measure the finished cable’s outside diameter against your conduit fill limits before the run.
- Apply derating for bundling or high ambient heat, then buy the length.
FAQs
Is 2 AWG The Same As 2 Gauge Wire?
Yes. AWG stands for American Wire Gauge, so 2 AWG and 2 gauge describe the same conductor size. The numbering runs backward, meaning smaller numbers are thicker wire, which is why 2 AWG is far heavier than 12 AWG. Any lug chart, spec sheet, or ampacity table using either label points at the same 0.2576-inch conductor.
Can 2 AWG Copper Wire Handle 100 Amps?
Yes, with room to spare. The lowest ampacity Table 310.16 gives 2 AWG copper is 95 amps at 60°C, and a 75°C termination pushes that to 115 amps. A 100-amp feeder still has to survive derating for ambient heat, bundling, or conduit fill, and those adjustments can pull the usable number below the load.
Why Do Ampacity Charts Disagree About 2 AWG Copper?
Most disagreements trace back to the temperature column, not the wire. One chart quotes the 90°C value of 130 amps, another quotes 115 amps at 75°C, and a third uses the 60°C figure of 95 amps. Installation conditions — free air, cable, raceway, ambient heat, conductor bundling — shift the result further, so the column and method travel with the number.
References & Sources
- Cerrowire. “Ampacity Charts” Supplies the 2 AWG copper ampacity values across the NEC Table 310.16 temperature columns.
- Lapp Tannehill. “Ampacity Chart” Supports the practical 115-amp limit tied to 75°C terminations.
- Mercury Wire. “Copper Wire Gauge” Source for 2 AWG conductor diameter and cross-sectional area.
