NEMA L7-30 — 277 V, 30 A Twist-Lock Plug & Receptacle
NEMA L7-30 is a twist-locking configuration per NEMA WD-6: 277 V, 30 A, 2-pole 3-wire grounding. 277 V lighting feeds. The receptacle is L7-30R, the matching plug L7-30P.
No free-licensed face diagram exists for this configuration yet — locking faces are not on Wikimedia Commons. The specs below still identify it unambiguously.
Specifications
- Configuration
- L7-30
- Series
- Locking (L / twist-lock)
- Voltage rating
- 277 V
- Amp rating
- 30 A
- Poles / wires
- 2P–3W
- Neutral
- Yes
- Equipment ground
- Yes
- Max load (at rating)
- 277 V × 30 A = 8,310 VA
- Continuous (80%)
- 6,648 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
277 V lighting feeds. The locking blades twist in and cannot vibrate or pull loose — the reason generators, stage rigs, and equipment connections spec the L series over its straight-blade cousins.
RELATED CONFIGURATIONS
See every configuration on the full NEMA plug & receptacle chart →
Common questions
What is the difference between L7-30R and L7-30P?
The letter is the device: L7-30R is the receptacle (outlet), L7-30P is the plug on the cord. Both share the same configuration — 277 V, 30 A, 2-pole 3-wire grounding, twist-locking blades.
Does NEMA L7-30 have a neutral and a ground?
Yes on the neutral — the 277 V rating means the circuit includes a grounded (neutral) conductor. It carries an equipment grounding conductor (the extra wire beyond the poles).
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