Both are 50-amp, 240-volt outlets on the same wire and breaker — the difference is a neutral. The 14-50 is 4-wire (two hots, a neutral, and a ground) and can supply 120 V too, so it's the standard for ranges, RVs, and dual-use EV outlets. The 6-50 is 3-wire (two hots and a ground, 240 V only) — the classic welder outlet and a clean choice for a dedicated EV circuit. For a plug-in EV charger, most people install a 14-50(with a GFCI breaker); if the circuit will only ever run a 240 V load and you want no idle neutral, the 6-50 is simpler. Above 48 A, skip the plug and hardwire.
Wiring a 50-amp outlet? Size the circuit with the free EV charger circuit calculator or the welder circuit calculator. This page covers which receptacle to put on the end of it.
⚖️ 14-50 vs. 6-50 at a Glance
Head to Head
| Factor | NEMA 14-50 | NEMA 6-50 |
|---|---|---|
| Wires | 4 — 2 hot, neutral, ground | 3 — 2 hot, ground |
| Voltage | 120/240 V | 240 V only |
| Rating | 50 A | 50 A |
| Neutral | Yes — allows 120 V | No |
| Typical use | Range, RV, plug-in EV | Welder, dedicated EV |
| Wire & breaker | Same 50 A circuit | Same 50 A circuit |
Same circuit, same breaker — the only wiring difference is whether you pull a neutral.
🔌 The one real difference: the neutral
Both outlets deliver the same 240 volts across their two hot legs, and both are 50-amp devices on a 50-amp circuit. The 14-50 adds a neutral — a fourth wire that taps 120 volts from either hot leg. That neutral is what lets an RV or a range run its 120-volt accessories (lights, controls, outlets) off the same plug.
The 6-50 has no neutral — just two hots and a ground. A pure 240-volt load (a welder, most EV chargers) doesn't need 120 volts, so the neutral would sit unused. That's why the 6-50 is the natural choice when nothing on the circuit needs 120 V, and the 14-50 wins when something does.
🏠 What each is for
NEMA 14-50
- Electric ranges (the modern range plug)
- RV hookups (needs 120 V for the coach)
- Plug-in EV chargers (the common EV receptacle)
- Any garage outlet you want to keep dual-use
NEMA 6-50
- Welders (the classic 240 V welder outlet)
- Dedicated EV circuits with no 120 V need
- Plasma cutters and other pure-240 V tools
- Cleaner wiring where a neutral would be wasted
🚗 Which for an EV charger?
Either works — an EV charger is a pure 240-volt load, so it never uses the 14-50's neutral. In practice, most plug-in chargers ship with a 14-50 plug because it's the most common high-power receptacle (also used for RVs and ranges), which makes the charger portable between outlets. A 6-50 is a perfectly good, slightly simpler alternative when the outlet is dedicated to the car.
Two code points for a plug-in EV outlet. A 240 V EV receptacle needs GFCI protection (NEC 625.54, and the 210.8 receptacle rules) — usually a GFCI breaker — and, either way, the charger caps at 80% of the breaker (a 50 A circuit charges at 40 A). Want more than 40 A of charging? That means a 60 A circuit and a hardwired unit — above 48 A, plugs aren't used at all.
So the receptacle choice only matters for a plug-in charger up to 40 A. For a bigger charger you hardwire, and the plug question disappears. Size it with the EV charger calculator.
🧵 Same wire, same breaker
Because both are 50-amp circuits, the wire and breaker are identical: a 50 A breaker feeding the copper (or aluminum) the ampacity tables call for — commonly 6 AWG copper for 50 A. The 14-50 simply carries one extra conductor (the neutral), so its cable is a 4-conductor type; the 6-50 uses a 3-conductor cable. Cost is nearly the same.
One caution: don't reuse a 3-wire circuit for a 14-50 (or vice-versa) by faking the missing conductor. If you need a neutral, run a neutral; if you don't, leave it out. Never bond the neutral and ground at the outlet. Confirm the exact conductor with the wire size calculator.
✅ The bottom line
Pick by whether the circuit needs 120 volts. 14-50 if anything on it does — a range, an RV, or a garage outlet you want to keep flexible — which also makes it the default for a portable plug-in EV charger. 6-50 if it's a pure 240-volt load like a welder or a dedicated EV outlet, where the neutral would just sit idle. The wire and breaker are the same either way; only the plug and the presence of a neutral change.
Whichever you choose, put a plug-in EV outlet on a GFCI breaker, and hardwire anything above 48 A. Adopted NEC editions and local amendments vary — confirm with your AHJ and a licensed electrician. Size the circuit with the EV charger or welder calculator.
Estimate your EV Charger Circuit materials
What wire and breaker does your EV charger need? Free NEC Article 625 calculator by EVSE amps — 125% rule, hardwire vs plug, GFCI, and run length.
Estimate with the EV Charger Circuit Calculator →