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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThe key difference is voltage: NEMA L5-20 is a 20A, 125V locking connector, while NEMA L6-20 is a 20A, 250V locking connector. Their shared 20A rating does not make them interchangeable; the equipment, connector configuration, and supply must match.
How L5-20 and L6-20 compare
| Feature | NEMA L5-20 | NEMA L6-20 |
|---|---|---|
| Rated voltage | 125V | 250V |
| Rated current | 20A | 20A |
| Device class | Two-pole, three-wire grounding | Two-pole, three-wire grounding |
| Common device designations | L5-20P plug; L5-20R receptacle | L6-20P plug; L6-20R receptacle |
| Use when | Equipment and supply specify the 125V L5-20 configuration | Equipment and supply specify the 250V L6-20 configuration |
These ratings and classifications are listed by American Denki, AutomationDirect, and Eaton. In these device designations, “P” means plug and “R” means receptacle.
What the “L” means—and why the patterns differ
The “L” identifies a locking style: insert the connector and twist it to secure the connection and help reduce accidental unplugging. Grainger’s NEMA guide describes this locking action and lists L5-20 as 125V/20A and L6-20 as 250V/20A.
L5-20 and L6-20 have different contact configurations as well as different voltage ratings. Both are two-pole, three-wire grounding devices, but that shared classification does not establish that a plug will fit or work safely in the other configuration. Do not identify conductors from the number of contacts alone: a configuration chart marks L5 contacts W and G and L6 contacts X, Y, and G. Check the markings on the actual device and follow its manufacturer’s instructions for terminal identification.
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Can you use an L5-20 plug in an L6-20 outlet?
Do not assume you can. The configurations and voltage ratings differ, so a 20A label alone is not enough to establish compatibility. A connector that does not fit is a warning to stop and verify the equipment and supply—not a reason to alter the plug, receptacle, or grounding contact.
Before replacing a connector or considering an adapter, identify the equipment’s specified voltage and connector type, then verify the circuit and receptacle ratings. Any proposed adapter or wiring change must be evaluated against the equipment, supply, overcurrent protection, manufacturer instructions, and applicable code; the shared amperage does not establish that a change is suitable.
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How to choose the correct replacement
- Read the equipment nameplate. Confirm the required voltage and connector configuration rather than relying on the old plug’s appearance.
- Check the circuit and receptacle markings. Confirm their ratings agree with the equipment specification.
- Match the full designation. Use an L5-20 device for equipment and supply specified for L5-20 at 125V, or an L6-20 device for equipment and supply specified for L6-20 at 250V. Verify the plug (P) or receptacle (R) type required.
- Stop if anything is unclear. Have a qualified electrician identify the wiring and installation before replacement or modification.
Preserve the grounding path
Both configurations include a grounding conductor; it is not an extra contact to repurpose. OSHA states that “The path to ground from circuits, equipment, and enclosures shall be permanent and continuous” in 29 CFR 1926.404(f)(6), a construction-workplace standard. OSHA also says a receptacle, cord connector, or attachment plug grounding terminal may not be used for any purpose other than grounding. These requirements provide important safety context, but they do not replace local electrical codes or the device manufacturer’s instructions.
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