NEMA L17-30 — 3Ø 600 V, 30 A Twist-Lock Plug & Receptacle
NEMA L17-30 is a twist-locking configuration per NEMA WD-6: 3Ø 600 V, 30 A, 3-pole 4-wire grounding. Three-phase 600 V with ground. The receptacle is L17-30R, the matching plug L17-30P.
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
- L17-30
- Series
- Locking (L / twist-lock)
- Voltage rating
- 3Ø 600 V
- Amp rating
- 30 A
- Poles / wires
- 3P–4W
- Neutral
- No
- Equipment ground
- Yes
- Max load (at rating)
- √3 × 600 V × 30 A = 31,177 VA
- Continuous (80%)
- 24,942 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 600 V with 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.
Common questions
What is the difference between L17-30R and L17-30P?
The letter is the device: L17-30R is the receptacle (outlet), L17-30P is the plug on the cord. Both share the same configuration — 3Ø 600 V, 30 A, 3-pole 4-wire grounding, twist-locking blades.
Does NEMA L17-30 have a neutral and a ground?
No neutral — the 3Ø 600 V rating means the circuit runs line-to-line with no neutral. It carries an equipment grounding conductor (the extra wire beyond the poles).