NEMA L10-30 — 125/250 V, 30 A Twist-Lock Plug & Receptacle

NEMA L10-30 is a twist-locking configuration per NEMA WD-6: 125/250 V, 30 A, 3-pole 3-wire non-grounding. Legacy split-phase, no ground. The receptacle is L10-30R, the matching plug L10-30P.

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: L10-30
Series: Locking (L / twist-lock)
Voltage rating: 125/250 V
Amp rating: 30 A
Poles / wires: 3P–3W
Neutral: Yes
Equipment ground: No
Max load (at rating): 250 V × 30 A = 7,500 VA
Continuous (80%): 6,000 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

Legacy split-phase, no ground. 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

L10-20Straight-blade twin: 10-30

See every configuration on the full NEMA plug & receptacle chart →

Common questions

What is the difference between L10-30R and L10-30P?

The letter is the device: L10-30R is the receptacle (outlet), L10-30P is the plug on the cord. Both share the same configuration — 125/250 V, 30 A, 3-pole 3-wire non-grounding, twist-locking blades.

Does NEMA L10-30 have a neutral and a ground?

Yes on the neutral — the 125/250 V rating means the circuit includes a grounded (neutral) conductor. It is a non-grounding configuration: no equipment ground, which is why new installations use its grounding successor.

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