NEMA 10-30 Extension Cord

NEMA 10-30 Extension Cord

I just purchased an NEMA 10-30 extension cord with the intention of occasionally charging from a dryer connection at a friend's house. The dryer is located close to the garage, but not quite close enough to reach it with the mobile charger cord. Without it, I am reduced to plugging into 110v with the 12+ hours charging time message. I normally charge in my garage with a NEMA 14-50 plug without an extension cord.

Does anyone have experience with charging from a dryer connection using an extension cord?

negarholger | April 29, 2013

do you have a link for the 10-30 extension cord ?

jat | April 29, 2013

I wouldn't call it an extension cord, but before Tesla made the 10-30 adapter I made my own, which effectively added 6' to the cable. No problems at all, and as long as the cord was rated for dryer use I wouldn't expect a problem.

I haven't ever seen a dryer extension cord -- where did you find it?

Andrew_OH_S60andS70D | April 29, 2013
jat | April 29, 2013

Note that L6-30 is not a dryer plug, but is usually used with generators.

CarlE_P439 | April 29, 2013

I would love a NEMA 10-30 extension cord; I have never found one!

AlMc | April 29, 2013

It is also not that hard to make one IF you feel confident in doing the electrical connections yourself. You can buy everything you need at Home Depot/Lowes and make it any length you want. The longer the length though the larger the wire guage needs to be.

herkimer | April 29, 2013

Here are links to Amazon for

Camco 30amp extension cord:

or 50amp

These are 30 ft long, other lengths are available.
Wouldn't one of these work? Don't see any reason why not, as long as the wires are appropriate size and they certainly appear to be. These cords are heavy!

jat | April 29, 2013

@imherkimer - those are both 120V/30A plugs, and are not NEMA 10-30 plugs. It really isn't hard to match up the right ends, but I don't believe you will ever find them pre-made. How many people need to put their dryer 50' away from the dryer outlet? You *can* find NEMA 14-50 extension cords, as they are used by RVs -- that is why some people still made their own 14-50 => 10-30/14-30 adapters even after the official ones were available, since they could then use an extension cord.

EC-Zero | May 20, 2013

Here is a link to the cord I purchased:

No problems so far using this with the Tesla mobile connector instead of a charging station.

shop | May 20, 2013

Cool - first time I've seen such an extension cord. I also liked their product that converts two 120V receptacles into a 240V receptacle. A bit pricey but it looks like it'll do the job:

jayfrost | May 20, 2013

I have a similar scenario, but I built my cord to have a 10-30 male that converts to a 14-50 female. It cost about 50 bucks in parts and it is about 8 ft long. Works great. Pulls a steady 30 amp charge about 18m/h.

Thats the first time I have seen a true 10-30 extension cord. The parts used to build the cord seem to be good so I would assume it should work for you.


Beavertail S | May 24, 2013

I just found a great web site for Tesla adapters.

I ordered a 10-30 to 14-50 adapter. I already have a long Camco 14-50 extension cord I bought at Amazon, so this combo should allow me to use friends' dryer plugs when I travel. I hope this helps others on this thread.

jat | May 24, 2013

@jayfrost - you should not be charging at 30A off a 10-30 receptacle -- charging is considered a continuous load (>3 hours), so you have to derate everything by 25%. Otherwise, you risk heat buildup in the house wiring causing problems or tripping the breaker. This is why the car automatically switches to 24A when you use a Tesla 10-30 or 14-30 adapter.

Paul Koning | May 24, 2013

I wouldn't touch that "joiner" with a 10 foot pole. But an extension cord is a reasonable thing to do. Just get the parts, it's very easy. Make sure it's the same type connector at both ends, and get the right plug on the charger cable. An "adapter" that lets you plug in a plug for higher than the circuit rating is a very bad idea, not to mention a code violation. If you're lucky it will pop the breaker; if you're unlucky, things will overheat.

jat | May 24, 2013

@Paul Koning - as long as you tell the car to charge at the right amount, it should be fine -- of course, that leaves open the case of operator error.

Beavertail S | May 24, 2013

Helpful. I'll remember to charge off the 10-30 at 24 amps. Thanks.

shop | May 24, 2013

That EVSE site is great, I'm glad someone is selling that stuff. I wish Tesla would provide more adapters (and make enough to keep their current adapters in stock!). Making your own adapters is also fairly easy, and here's a document that explains how to. Enjoy!

Beavertail S | June 1, 2013

I received the 10-30 tp 14-50 adapter Thursday from evseadapters and it has a big sticker on it reminding you to charge at only 24 amps. That proves to me that both the manufacturer and thread participants know what they are doing, good on ya.

rscheirer | June 1, 2013

We need an OEM manufacturer start-up to build all these things for us. Any electricians/engineers out there interested?! Elon 2.0!

Beavertail S | June 23, 2013

Final follow up from me. While travelling recently, I used the adapter to plug in to dryer plugs, connected the adapter to a camco 50 amp extension cord, then into my Tesla cable and into the car. I was carefull to set the charging amps to 24 at each new plug. After that, the car remembered the location and amperage. It all worked flawlessly and gave about 18 miles of range per hour of charging.

This system was vastly preferable to asking someone to give me rides to RV parks or public chargers, since if the charger is 20 minutes away, you need 2 twenty minute rides for both drop-off and pick-up. Less of an issue if the charger is close, but it is great to start each day fully charged from wherever you're staying.

cosmosmariner | October 15, 2013

We ran 25' of 6-3 w/ground, 4-wire copper (black sheathed cable) directly from the service off a 50-amp breaker (Lowe's) to an exterior NEMA 14-50 weatherproof, lockable RV power outlet. (Connecticut Electric, #PS-54-HR...Amazon order). Using a 30' Camco 50-amp power grip extension cord with Tesla's provided UMC. Not a bit of a problem with thirty-feet of extension + 20' UMC w/NEMA 14-50 adapter. Electrician says he doesn't worry about resistance issues unless he's running 200' or more off the service. Tesla will tell you that while aware that some folks have done this successfully, they can't recommend it. And who can fault Tesla Motors for saying that in todays litigious environment? Electrical bill (incl. 50A DP breaker, 3/4" PVC LP, TA–all but 6-3 wire, box, and extension cord) was $300. Hope this info helps; no need to cut the extension cord shorter and splice!

DTL | March 18, 2014

I can plug and charge at my work but Ill need to buy a 30 foot extension cord and would need a 10-30 plug. It seems its not safe to buy a cord then attach an adapter at the end. What do you veterans suggest? Id like to buy it this week so Im ready to go and charge when I pick it up. I rent an apartment in a high rise building in LA that wont allow me to charge in the parking garage. Thank you in advance for any help you can provide. If you can please send me a link if you know of a product that would work. Take care.

Im assuming I cant combine these 2 products: (theres a review by a TMS owner on 2nd cord) or


It doesnt look like an exact match for the outlet in the pic below:

Here is a photo of the outlet at my work. Sadly, its only 125V. It does have 30A though. Not sure how many mph I can get. | March 18, 2014

@DTL - Looks like that connector is actually 240v 15 amp NEMA 7-15 (which is the same power as 120v 30 amp). I do see it's labeled on the connector as 125V, so I don't quite know what to make of it. I'd measure the voltage to confirm.

shop | March 18, 2014

Yes, that plug is a TT-30 that can deliver 30A at 120V.

It is NOT a NEMA 10-30 plug, so your product links above are for the wrong plug.

In theory, the Model S would be able to charge at 24A, 120V on this plug, but for some unknown reason, the Model S limits charging to 20A when connected to 120V. So that will get you about 7.5 miles of charge per hour.

Probably the cheapest thing to do is to go to Home Depot (or whatever) and buy 30' of the most heavy duty extension cord you can find (12 gauge minimum, 10 gauge ideally) and then buy a TT-30 plug and a NEMA 14-50 receptacle. Chop off the ends of the extension cord and wire it up. Let me know if you go this route and I'll help you with the wiring.

Alternatively, you can buy something like what you linked to above, a much heavier NEMA 14-50 extension cord rated for 50A.

Either one of these will work. I like the second one better since it isn't as stiff or heavy, but it is only 25':

You will also need a TT-30 to NEMA 14-50 adapter, and EVSEAdapters does sell one of these:

Brian H | March 18, 2014

I thought it was illegal in CA to ban charging in an apt. garage. ??

shop | March 18, 2014

I believe that law is meant for condos. I don't think rental apartments are required to offer EV charging.

DTL | March 18, 2014

really? What law is that? There is a regular outlet in the garage and I asked to use it but they told me I could not.

DTL | March 18, 2014

oh right. just saw your message @shop. sadly, i tihnk youre right. any tips on my cable charging questions at work?

shop | March 18, 2014

For work, find a suitable electrical source and then just ask the facilities manager or building owner for permission to plug in.

DTL | March 19, 2014

@TeslaTap and @shop: For some reason just saw your posts. Thanks for the help. I am still a bit confused. My Tesla delivery specialist told me it's a NEMA 10-30 plug; @TeslaTap you state that it is a NEMA 7-15, and then @shop you write that I should get a NEMA 10-30 plug. Which one should I get?

I am leaning towards going with @shop's recomendations. THis is what I'm thinking as I dont feel comfprtable making the acbles.

1) Buy adapter; should I buy "a" or "b"; a is cheaper but it seems b may be the more official option due to complicated wiring needed for teslas.


2) Buy extension cord. Since I can only pull 30amps off the TT-30 and even if I use a washer/dryer both the 10-30 and 14-50 use 30amps so Im going to save about $70 by getting the 30amp option.

3) In order to use a washer dryer both new and old at friend's homes I am going to buy the following adapters. I can plug these into the above TT30 extension cord right?

a) For 14-30 dryers:

or according to this tesla forum I dont need to buy an adapter: "just remove the 14-50 neutral prong and the 14-50 now fits 14-30, 14-50, and 14-60" Is that right?

b) For 10-30 dryers:

THanks for all your help.