NEMA 15-30 — 3Ø 250 V, 30 A Plug & Receptacle
NEMA 15-30 is a straight-blade configuration per NEMA WD-6: 3Ø 250 V, 30 A, 3-pole 4-wire grounding. Three-phase with ground. The receptacle is 15-30R, the matching plug 15-30P.
Face diagrams by Comrade Mmirg via Wikimedia Commons, CC BY-SA 4.0 / CC0, unmodified.
Specifications
- Configuration
- 15-30
- Series
- Straight blade
- Voltage rating
- 3Ø 250 V
- Amp rating
- 30 A
- Poles / wires
- 3P–4W
- Neutral
- No
- Equipment ground
- Yes
- Max load (at rating)
- √3 × 250 V × 30 A = 12,990 VA
- Continuous (80%)
- 10,392 VA
Load figures are the arithmetic of the device rating at unity power factor. Continuous loads (3 hours or more) are limited to 80% of the circuit rating per NEC 210.19/210.20 — and the branch circuit behind the receptacle comes from the load calculation and conductor sizing, not from the plug face.
Where you meet it
Three-phase with ground. Blade geometry keys the voltage family physically: a plug from a different voltage class will not enter this receptacle.
RELATED CONFIGURATIONS
See every configuration on the full NEMA plug & receptacle chart →
Common questions
What is the difference between 15-30R and 15-30P?
The letter is the device: 15-30R is the receptacle (outlet), 15-30P is the plug on the cord. Both share the same configuration — 3Ø 250 V, 30 A, 3-pole 4-wire grounding.
Does NEMA 15-30 have a neutral and a ground?
No neutral — the 3Ø 250 V rating means the circuit runs line-to-line with no neutral. It carries an equipment grounding conductor (the extra wire beyond the poles).
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