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Weatherproof Cable
Designed with an SJTW jacket, this outdoor-rated wire excels in extreme conditions, withstanding temperatures from -40°F to 221°F, ensuring reliable performance and durability in various weather conditions
Easy to Carry and storage
Comes with an adjustable strap for easy coiling and storage, allowing it to be hung on the wall of your garage or studio when not in use
christopher.robot
Reviewed in the United States on May 25, 2025
I use NEMA style plugs for breaking out 240V & 3-phase power, so that there's no confusion around the shop. This works great, and seems to handle high currents well.
The Passenger
Reviewed in the United States on March 8, 2025
This is a review for FIRMERST 30 Amp Generator Extension Cord 4 Prong, 12 Feet NEMA L14-30P/L14-30R SJTW Cable, ETL Listed. Brand: FIRMERSTVery heavy duty generator extension cable. Consistent with my other 10AWG cables in terms of heft and feel. Comes with a great nylon carry / storage handle to keep it bundled up. Good strain relief on the ends, quality plugs that are not too large to fit into recessed receptacles (typical of generator hookups).Working great with my welder and generator!
Reviews and Information
Reviewed in the United States on March 3, 2025
The coil memory from the pack didn't last too long. It isn't the floppiest cable out there, but being SJTW instead of STW gives it a little extra give from the thinner jacketing. Both of the plugs plug-in and twist to lock without issue.
AJ Tissier
Reviewed in the United States on March 13, 2025
Decent quality generator hookup cable. I have several on hand for hooking up generators at several buildings on my property. Connector quality is good. The yellow color is a little off from the bright yellow that most extension cords are, but that does not affect functionality or usability.
JSC
Reviewed in the United States on March 1, 2025
This cable is good at tapping into power source that use L14-30 "R" receptable, which I see in some generator models or inlets, and use to those designations supporting the 14-50 type, like a level 2 EV charger. The cable itself looks good and the color yellow stands out so good for temporary use. The connectors lock in pretty solid, including twist-n-lock on the 14-30 side.
1SamIam
Reviewed in the United States on March 1, 2025
This 12 foot 30 Amp Extension Cord is made really heavy duty and yet is flexible making it easy to handle. It features the four prong male and female twist lock connectors of 10/4 AWG Pure Copper stranded wires.Comes with a BONUS carry strap that is perfect to also keep the cord stored and ready to use.It is ETL listed for electric safety certification standards.Perfect for the Emergency Power Generator System and at a great value too!
Rachel Schock
Reviewed in the United States on April 7, 2025
Storm season brings the need to have back-up power options ready. This FIRMERST extension cord is great to have on hand. The build quaity is great. It really feels heavy duty. It worked really well with my Westinghouse generator. I happy I came across this item.
Ally
Reviewed in the United States on April 1, 2025
The cord is thick and feels heavy and looks to be made of high qaulity materials . I didn't cut the wires to check the house but the weight alone and stiffness tells me it is proper gauge by weight.The ends are both well made and I see no quality issues with it. I think it's priced well and has a thick supple yellow jacket that's fully waterproof and has high visibility. It functions just as it should and I have no complaints.
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