What Size Wire for a 50 Amp RV Outlet?
Wire and breaker sizing for a 50 Amp RV Outlet — the typical 240V circuit, plus the code details (NEC 310.16) 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.
50 Amp RV Outlet Circuit Details
- A 50A RV outlet is a NEMA 14-50: two 120V hots, neutral and ground (240V across the hots).
- A 50A circuit uses 8 AWG copper minimum (75°C); 6 AWG is common for long pedestal runs or 60°C terminations.
- GFCI is required for a 50A RV outlet at a dwelling (NEC 210.8(A) outdoor); NEC 551.71 does NOT require it on 30A/50A RV-park pedestals.
- It supplies up to 12,000W — far more than a 30A TT-30.
Long run to your 50 amp rv 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.