Quick answer
L14-30P is the plug and L14-30R is the receptacle. Both belong to the same 30A, 125/250V locking family. Confirm the label on each endpoint and do not substitute TT-30 or L5-30 simply because they also carry a 30A rating.
What the L14-30 designation tells you
The L identifies a locking family. The 14 family uses a configuration that supports 125/250V service, while 30 identifies the 30A class. The final P or R identifies plug or receptacle.
Leviton documentation identifies L14-30 as a three-pole, four-wire grounding configuration. Those details must be preserved across the generator outlet, cord, connector, and inlet.
Common generator and inlet applications
Many portable generators provide an L14-30R outlet for higher-capacity loads or a compatible building inlet. A cord may use L14-30P at the generator end and L14-30R at a compatible inlet end.
The presence of the receptacle does not approve a building connection by itself. A house also requires properly installed transfer equipment.
L14-30 is not TT-30 or L5-30
TT-30 is a 125V travel-trailer configuration. L5-30 is a 125V locking family. L14-30 is a 125/250V four-wire locking family.
Adapters between different systems require more than a physical fit. Verify voltage, conductor paths, connected loads, and the adapter’s documented application.
L14-30 matching checklist
Read the generator receptacle, destination inlet, and cord assembly labels. Confirm P and R direction, 30A rating, 125/250V configuration, four-wire grounding, environment rating, and suitable length.
Stop if any label is missing, altered, or inconsistent with the equipment manual.
Product to compare
Amazon · paid linksWEN PC3025 — 25 ft L14-30 generator cord
Compare this cord after confirming an L14-30R generator outlet and a matching L14-30P destination. Read both endpoint labels before choosing a cable.
- L14-30P → L14-30R
- 25 ft
- 10/4 SJTW
- 30A · manufacturer 250V rating
Amazon product code (ASIN): B0C86KSLYX
See the current price and available sellers on Amazon.
Advantages
- Locking L14-30 connections at both ends.
- Four-conductor 10/4 cable for this connector family.
- SJTW jacket specified for outdoor use.
Limitations
- A 25 ft length may not cover your cable route.
- Does not fit TT-30 or L5-30 equipment.
- A building connection still needs the correct inlet and transfer equipment.
Check before buying: Does not fit TT-30 or L5-30 equipment. Building connections also require the correct inlet, transfer equipment, and a site-specific electrical review.
Based on manufacturer specifications; not independently field-tested by CordFind. Confirm the model and both connector labels before buying.
Frequently asked questions
Common questions
What is the difference between L14-30P and L14-30R?
L14-30P is the plug; L14-30R is the receptacle. They are mating parts of the same connector family.
Is L14-30 a 120V or 240V plug?
The family is rated 125/250V and supports a split-phase configuration. The actual connected equipment and generator setup still determine how it is used.
Can L14-30 connect directly to house wiring?
It may connect to a compatible power inlet, but the building still needs properly installed transfer equipment. Never backfeed a household outlet.
Primary references
CordFind summarizes connector specifications and public safety guidance. Always follow the instructions supplied with your equipment.
- Leviton — L14-30R Product 2710
- Leviton — 30A Locking Device Catalog