What Size Wire for a NEMA 14-50 Outlet?
Wire and breaker sizing for a NEMA 14-50 Outlet — the typical 240V circuit, plus the code details (NEC 210.8) that change the answer.
Calculations are built on the 2023 National Electrical Code (NEC) and cross-checked against the published code tables. How we verify. Last reviewed June 2026.
On a 50A 240V circuit (NEMA 14-50) at 75°C terminations. 60°C terminations: 6.
Protected by a 50A breaker (NEC 240.6).
GFCI required. The 2023 NEC (210.8(D) for specific appliances, 210.8(A) for kitchen/outdoor receptacles) requires GFCI protection here. Verify the code edition your jurisdiction has adopted.
NEMA 14-50 Outlet Circuit Details
- A NEMA 14-50 is a 50A, 240V receptacle used for EV charging, ranges and RVs.
- A 50A circuit needs 8 AWG copper minimum at 75°C terminations; many installers run 6 AWG for voltage-drop headroom or 60°C-rated terminations.
- NEC 210.8 requires GFCI protection for 14-50 receptacles in dwellings.
Long run to your nema 14-50 outlet?
Over distance, voltage drop can require a larger wire than the table above. See the 50A wire size by distance:
Size it for your exact install
Open the calculator pre-filled with 50A at 240V to add distance, material and temperature.