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Inteset 21ft 40amp J1772 EV Extension Cord, Made in USA - for Electric Vehicle Charging Stations, Carrying Bag, Ultra-Flex Cable, UL Listed Parts

  • Based on 181 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon

Arrives Sunday, Jun 16
Order within 17 hours and 35 minutes
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Size: 21 ft - 40 amp


Features

  • Extend the length of your charging station cord - 40 amp continuous use Indoor and outdoor (IP65) - do not submerge in water. This is not a charger. It extends a charger cable.
  • Portable - light weight, includes carrying bag. Ultra-flex, high quality cable - Made in the USA - wont stiffen in cold weather for easy coiling. Works with all Type 1, SAE J1772, Level 1 and 2 chargers except the Tesla J-1772 Wall Connector
  • Compatible with all vehicles that accept the J-1772 connector (including Teslas with adapter except with the Tesla Wall Connector Charger). All pins machine crimped for better conductivity, strength, and safety.
  • 2 year warranty. ASSEMBLED and SUPPORTED in the USA. Contact us at intesettech.com. All indoor/outdoor UL recognized parts (connector (cRUus E364477), receptacle (cRUus E364477), cable (UL 62))

Color: Black


Brand: Inteset


Connector Gender: Male-to-Male


Input Current: 40 Amps


Plug Format: Type A


Product Dimensions: 16 x 12 x 4 inches


Item Weight: 7.78 pounds


Item model number: SUPTMAX


Is Discontinued By Manufacturer: No


Date First Available: January 28, 2020


Manufacturer: Inteset


Country of Origin: USA


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Jun 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Rated for 48 amps
Size: 20 ft- 48 amp
I purchased the 48 amp extension. It is made of #8 (or 8 AWG) wire. This is the same size as the cable used on a 48A Clipper Creek charger. A 40A Clipper Creek charger uses #10 (or 10 AWG), which lines up with the 40A extension sold by Inteset. I've only used the cable once at 24A so far, but it worked flawlessly. The terminations look professional, and the bag is a nice touch. The cable itself is heavy but flexible and has no memory issues (it does not curl up on its own when stretched out). It came with a label zip tied to the cable that indicates the maximum size charger to use. I plan on leaving that attached as a reminder. As an emergency extender this cable seems to be the best choice. I purchased a 50A extension cord that would go between the charger and socket, but realized that only works with a 14-50 receptacle. This 48A extension will work with whatever charger is available and at L2 or L1 charge rates. I purchased the 48A version as that is the highest charge rate my Mustang Mach E will accept. So I can use this extension with higher rated chargers as the car will limit the current to 48A, which happens to be the rating of this cable. I want to include some information on the NEC (NFPA 70) and the rating of this cable. These reviews had me really concerned as I do not want to burn down my house! However, people are attempting to apply building code to the size of this cable. That is not appropriate. For anyone interested please refer to NEC, 2023 revision, section 625.17(B), pg 559: the NEC does not specify the size of the cable between the charger (EVSE) and the vehicle, they leave that to UL. There are NEC specifications (625.17(A)(2) pg 559) for the cable between the charger and the receptacle (or electrical box that connects to the building wiring) but that references the 'flexible cord' tables 400.4, 400.5(A)(1), and 400.5(A)(2) on pages 287 and 288. Those tables do NOT use the 80% rule; probably because these cables are not to be placed inside walls, use different insulation, etc. As these tables should not be applied to this extension I included what size of cable 40A and 48A chargers use which is #10 and #8 respectively and is the same size as the cables offered by Inteset. This would be a safe check when using the extension... if the charger cable is smaller or the same size as the extension (per label on the side of the cable, not the diameter of the cable) then you're good to go! Also, wire size is backwards: #8 is bigger than #10, which is bigger than #12, etc. ... show more
Reviewed in the United States on May 20, 2023 by A.N. A.N.

  • High Quality and Heavy Duty Product of USA, See Update
Size: 21 ft - 40 amp
Update 2 (3/2023): My cable finally completely failed last week. Neither car would charge from the cable anymore. Since the cable was now 1.5 years out of warranty, I went ahead and disassembled it and found that, on the socket end, both of the main conductors had come out of the pins. The only one still intact was the ground. The problem was the copper conductors were not crimped as the current video shows, but instead were poorly soldered. There wasn't enough solder applied to the hot and neutral conductors and they simply pulled out eventually. I was able to properly re-solder them, allowing the liquid solder to flow inside the pins, so they would not pull out again and the cable is working. As mentioned above, it now appears that they crimp the connections rather than soldering them, which will make for a much more reliable and longer-lasting cable. Good move on their part. Update 1: After 2 years, the outer (black) sheath insulation on the charger (socket) end of the cable slipped out of the connector, exposing the inner wires. They are still pretty well insulated, but during rain, it could allow moisture to enter the charger end socket connector. The vendor stated the cable was out of warranty and wanted to charge me $50, and, of course, I would have had to play outbound postage, to fix it, so I went ahead and loosened the compression nut so it again covered the end of the outer insulation. The root of the problem is that the insulation on the socket end was stripped back too far and, after exposure to cold weather, the outer insulation shrunk back enough to expose the conductors. Unfortunately, the outer insulation shrunk again and re-exposed the conductors. Initial Review: This feels like a well made product with high quality connectors and cable. I also like the fact that it's made in America. The storage bag is also a nice perk. Overall, so far I think it's a very good product and it certainly has come in handy to help us avoid having to move our two EVs around to charge one or the other as we have a one-car garage and the charger cable is not long enough to reach the second car parked behind. ... show more
Reviewed in the United States on August 8, 2020 by 127.0.0.1

  • Insulation is exposed after 7 months of use
Size: 30 ft- 40 amp
I got this cord in Sept. 2022 for my 2022 Chevy Bolt. It has been working fine but all of a sudden I noticed what I assume is insulation, is exposed where the cord goes into the piece that connects to the charger cord. Quite a pricey item to have this kind of problem already I think. I have filled out a form online at inteset.com, waiting to hear back. There is a 2 year warranty, I hope they honor it. I see another review here with a photo of the same problem. Update: Still waiting to hear from them. Tried calling the only number I could find on their web site but it went to a sales guy working remotely from home who had no idea if or how long it would take anyone to respond to my online form. I can not recommend this product at this time. Update- I heard from customer service because of this review, they claim they never got my message which I sent on their contact page on the web site, which is the only way to contact them. Now they have offered to repair my cable but I need to ship it back and pay for shipping. They say they will fix it the day they receive it and send it back and pay for return shipping but it will take about 10 days. Kind of a problem when I use the cable once to twice a week. I have seen now 2 other reviews with photos of this exact same problem. I think they should replace it. ... show more
Reviewed in the United States on May 8, 2023 by Madeline Marrow Madeline Marrow

  • Works well
Size: 12 ft- 40 amp
Clips into the original charging plug to provide a 12’ extension. Be sure to buy amperage sufficient to the charger you’re extending.
Reviewed in the United States on May 19, 2023 by John C

  • Not a single hiccup
Size: 21 ft - 40 amp
Cord worked in a perfect bag, perfect quality, and worked perfectly with a 23 EUV Bolt. The bag even was able to fit the charger that came with the vehicle. Only wish I could’ve got the 30 foot one but it was a little bit outside my price range. This is why I got four stars in that department.
Reviewed in the United States on March 31, 2023 by Pablo

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