Iron Box
Iron Box NEMA L14-30 Generator Extension Cord
Bottom line: The Iron Box NEMA L14-30 Generator Extension Cord ($68.99 on Amazon as of 2026-10-06): 10/4 SJT jacket carries the full 30A, 125/250V load across all four conductors; main trade-off: only fits NEMA L14-30 twist-lock generators, not 5-20 or TT-30 outlets.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 10/4 SJT jacket carries the full 30A, 125/250V load across all four conductors
- ✓ UL Listed with brass alloy plug contacts for reliable conductivity
- ✓ Impact-resistant nylon 6 housing on both L14-30 plug and connector
- ✓ 25 ft reach parks the generator well away from the house
Cons
- ✗ Only fits NEMA L14-30 twist-lock generators, not 5-20 or TT-30 outlets
- ✗ 10/4 gauge at 25 ft is stiff and heavy to coil in cold weather
- ✗ Listing cites both SJT and SOOW jacket, so confirm the jacket type before burial
- ✗ No transfer switch, inlet box, or adapters included
SpecPicks Verdict
SpecPicks scored Iron Box NEMA L14-30 Generator Extension Cord using a rating × review-volume × price-fit model applied to published specs and reviews across the home & kitchen category. Iron Box's home & kitchen lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for home & kitchen of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- DURABLE CONSTRUCTION: Featuring premium materials, this NEMA L14-30 generator extension cord is designed to deliver consistent 30 amp power. Suitable for a range of environments, it adapts smoothly to various power demands, ensuring steady and uninterrupted performance in outdoor, industrial, and residential settings. This cord’s robust design ensures long-lasting functionality, even in challenging conditions.
- QUALITY COMPONENTS: Built with heavy-duty wiring components, this extension cord includes industrial-strength brass alloy plug contacts for excellent conductivity. Its tough, impact-resistant nylon 6 housing increases the cord’s durability and provides excellent protection against wear and tear. Designed to withstand tough conditions, this power cord ensures safe, efficient power transfer for a wide range of applications.
- STEADY PERFORMANCE: This 30 amp generator cord is engineered to maintain a stable and consistent electricity flow, even in demanding environments. Whether used for emergency backup or regular power needs, it helps your generator operate smoothly without interruptions. Its solid construction minimizes the risk of voltage drops, offering consistent power delivery for all your electrical requirements.
- VERSATILE UTILITY: This generator extension cord offers steady performance and consistent functionality. It’s ideal for residential, commercial, and industrial applications. This heavy-duty power cord meets a variety of electrical needs, including outdoor power tools, emergency backup, RV setups, and more. Whether for home, business, or construction use, it’s the ideal choice for anyone seeking a versatile and durable power option
- ENHANCED ADAPTABILITY: Built with 10/4 SOOW wire, this generator power cord is designed for excellent versatility. It can be used in temporary setups or permanent installations, including direct burial for underground use. Whether for your home, office, or construction site, this extension cord provides the durability and flexibility required to meet your power delivery needs.
Full Specifications
| Brand | Iron Box |
|---|---|
| Color | Molded |
| Voltage | 125 Volts |
| Wattage | 7500 watts |
| UL Listed | Yes |
| Unit Count | 1.0 Count |
| Item Length | 300 Inches |
| Model Number | IBX-5805-25 |
| Input Current | 30 Amps |
| Mfr Part Number | IBX-5805-25 |
| Connector Gender | Male-to-Female |
| Number of Outlets | 1 |
| Full listing title | Iron Box NEMA L14-30 Generator Extension Cord – 125/250V, 10/4 SJT, UL Listed, 30 Amp Generator 4 Prong, Heavy-Duty Power Cable for Home Backup Systems, Outdoor Use, Emergency Power Solution, 25 ft |
Ready to buy?
Iron Box NEMA L14-30 Generator Extension Cord – 125/250V, 10/4 SJT, UL Listed, 30 Amp Generator 4 Prong, Heavy-Duty Power Cable for Home Backup Systems, Outdoor Use, Emergency Power Solution, 25 ft is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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