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:
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Main feeder circuits
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Sub-panels
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High-amperage appliances (e.g., HVAC systems, electric ranges)
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Solar PV system connections
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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.
