CircleCord 30 ft 4-Prong 30A Generator Extension Cord with Inlet Box — 10 AWG SJTW, Weather-Resistant

CircleCord 4 Prong 30 Feet 30 Amp Generator Extension Cord and Inlet Box is a heavy-duty, ETL-listed L14-30 twist-lock power solution that safely connects a portable generator to a home's transfer switch or inlet.

When storms or outages strike, a reliable connection between your generator and home wiring is essential. This 30-foot, 10-gauge SJTW extension cord with an integrated inlet box gives you a professional-grade, weather-resistant interface for temporarily powering circuits up to 7,500 watts. Built to withstand outdoor exposure, it simplifies hookup while protecting wiring and contacts with quality materials and user-friendly features.

How does this cord and inlet box keep outdoor connections safe?

The unit uses 10 AWG pure copper conductors and heavy-duty SJTW jacketing rated for heat, UV, and water exposure, reducing risk from the elements. The twist-lock NEMA L14-30 connectors ensure a secure mechanical connection that resists accidental disconnection under load.

• ETL-listed manufacturing and testing for safety and performance.
• Flame-retardant, heat-resistant, UV-stable PVC jacket for outdoor durability.
• NEMA L14-30P to L14-30R twist-lock connectors for stable power transfer.
• Rated 125/250V up to 7,500 watts (30A maximum).

Can I install the inlet box myself without special tools?

Yes — the inlet box is designed for quick, tool-free preparation. Pre-fitted rubber plugs cover the four openings and are simple to remove by hand, avoiding the need for drills or knockout punches and reducing installation time.

• Four removable rubber plugs replace traditional knockouts.
• No specialized knockout punches or drilling required.
• Accessible box layout streamlines wiring to a manual transfer switch.

What makes this extension cord suitable for emergency and construction use?

The cable and connectors are engineered for frequent outdoor use and harsh conditions, making the set appropriate for emergency backup and temporary power during building projects. The included storage accessories help keep the cord organized and protected between uses.

• 10 AWG copper core supports sustained heavy loads up to 30A.
• SJTW jacket resists rain, snow, soil, and abrasion for job-site durability.
• Comes with a storage bag and adjustable cord organizer for transport and storage.

How do I know this product will connect correctly to my generator and transfer switch?

The connectors follow standard NEMA L14-30 configurations used by many portable generators and manual transfer switches. Confirm both devices accept L14-30 twist-lock connectors and that your load does not exceed 30 amps or 7,500 watts for safe operation.

• NEMA L14-30P male plug mates with L14-30R female inlet and transfer switches.
• Labeling and standard pin configuration prevent misconnection.
• Intended for temporary power — not permanent hardwiring to mains without a proper transfer switch.

Who is this for: Homeowners, contractors, and property managers who need a dependable, weatherproof way to connect portable generators to a home’s manual transfer switch or inlet during outages or construction. It’s also suited to anyone wanting a ready-to-use, tool-free inlet box with a robust 30-foot, 10-gauge extension cord for temporary 30A, 125/250V power connections.