Aren't they the same outlet?
Often the same device — a NEMA 14-50R — but not the same circuit. The receptacle looks identical; the load behind it behaves completely differently.
What's the actual difference then?
A range is an intermittent load. Elements cycle on and off, and the oven, burners, and broiler are almost never all at max at once. The NEC lets you take a demand factor on ranges (Art. 220.55), which is why a 50A circuit can legally feed a range with a nameplate well above 50A. EV charging is a continuous load — full current for 3+ hours straight. Continuous loads get sized at 125%. A 40A EVSE needs a 50A circuit, full stop, with no demand-factor credit. Same outlet, different math.
Can I just plug my EVSE into the old range outlet in the garage?
Only if it's a 4-wire circuit properly sized and protected for continuous duty. Two common problems:
- Old NEMA 10-50 (3-wire, no separate ground) — not acceptable for EV equipment.
- The receptacle itself. Hardware-store-grade 14-50s are built for a stove's duty cycle, not 40A continuous. They're the #1 source of melted plugs and scorched faces on EV installs.
What receptacle should be used for EV?
An industrial/spec-grade 14-50 (Hubbell, Bryant, Leviton spec line). Also worth noting: hardwiring the EVSE eliminates the receptacle as a failure point and is usually the better install.
Any other code differences?
Yes — three big ones for EV:
- EVSE must be on an individual branch circuit (NEC 625.40). Nothing else on it.
- GFCI protection is required for EV receptacles (625.54).
- Circuit sized at 125% of continuous load (625.41).