2 AWG copper wire can typically carry an ampacity of about 115 to 130 amps, with this range applicable when the wire operates at temperatures between 60°C to 75°C .
2 AWG Copper Wire
What Is 2 AWG Copper Wire?
2 AWG (American Wire Gauge) copper wire is a thick, heavy-duty wire commonly used for:
Main feeder circuits
Sub-panels
High-amperage appliances (e.g., HVAC systems, electric ranges)
Solar PV system connections
Industrial motor feeds
Its larger diameter means lower resistance and less voltage drop over distance.
Specific NEC Ratings by Temperature:
- 60°C (140°F): 115 amperes
- 75°C (167°F): 130 amperes
- 90°C (194°F): 145 amperes
Installation Method Impact:
- In conduit/raceway: Standard ratings apply (115-130A)
- Free air installation: Higher ampacity possible (up to 155A)
- Direct burial: Similar to conduit ratings with soil considerations
- Cable tray: May allow higher ampacity depending on spacing
Key Factors Affecting Ampacity:
- Insulation Type:
- THWN/THHN: 75°C rating (130A)
- XHHW: 90°C rating (145A)
- TW: 60°C rating (115A)
- Ambient Temperature Derating:
- Above 30°C (86°F): Apply derating factors
- 40°C: Multiply by 0.88
- 50°C: Multiply by 0.75
- Conductor Bundling:
- 4-6 conductors: 80% of rated capacity
- 7-9 conductors: 70% of rated capacity
Common Applications for 2 AWG Copper:
- Sub-panel feeders (100-125A panels)
- Large appliance circuits (electric ranges, large AC units)
- EV charging stations
- Pool and spa equipment
- Small commercial feeders
Safety Note: Always consult the current National Electrical Code (NEC) and local electrical codes for your specific application, as requirements may vary based on installation conditions and local amendments.
