I can't believe that we didn't already have a thread dedicated solely to adapters, so I started this one...
Don sent me an email and wondering what adapters I would recommend for an extended trip with his Volt. Good question, as, despite having a collection of adapters that will cover everything except a California Plug (I'm working on it), reality is that very few are really needed for our i-MiEV (or Volt). I'll discuss adapters and extension cords for 120vac and 240vac and J1772 and Tesla EVSE.
I think the everyday NEMA 5-15 plug is sufficient and there is no need for a fancier 20A NEMA 5-20 adapter. After all, our i-MiEV EVSE is limited to 8A or 12A (newer i-MiEV or EVSEUpgrade.com mod) at that voltage. See below for combined 120vac/240vac adapters.
Note that the following discussion is only about adapters for low-power (~3.3kW) EVSEs. If you're planning on a more-modern BEV (with 6.6kW or greater charging capability) in the future, then don't waste your money on these recommendations and simply standardize on NEMA 14-50.
For use with the i-MiEV or Volt, start off with a basic L6-20P as a plug on the end of the 240v (16A or less) EVSE cable as this will be the basis for the following NEMA-connector adapters:
L6-20R to three-prong 14-30/14-50/14-60 plug
We've discussed this extensively on other threads and we are talking about cutting off (or simply not installing) the Neutral pin on this male connector, which will allow this plug to work with any of the three above outlets. 14-50 is common in RV campgrounds, newer home ovens, and newer welders; 14-30 is used in modern home dryers. I've never seen a 14-60.
L6-20R to 10-30P
The 10-30 was the standard dryer connector in US homes until 1996, at which time it was replaced by the four-wire 14-30. I think that I have used 10-30 more than any other outlet as most of my friends have older homes and these outlets are very common either in the garage or in the laundry room adjacent to the garage.
L6-20R to 6-20P
On my cross-country trip I had two instances where I utilized a 6-20 receptacle: a friend had a lathe in his garage and a boatyard had a shop vacuum plugged into it. It's small and inexpensive enough that I'd carry this in my bag of tricks.
L6-20R to 6-50P
The 6-50 connector was used for older ovens and as an outlet for a welder. Surprisingly, I've used this a number of times as I've run across at least two homes that had these in their garages, and an RV park had one in their repair shop for welding (but did not have a 14-50 outlet at their campground). Although I've never actually gone to a welding shop, in my cross-country jaunts I always had that possibility as a backup plan in case I got into trouble, as welding facilities exist in virtually every town in this country.
5-15P to L6-20R and L6-20P to 5-15R
This pair of adapters will allow the use of a 240vac extension cord on 120vac. The 5-15P to L6-20R adapter is used with a multi-voltage (120vac and 240vac) EVSE and mates with its L6-20P plug.
EXTENSION CORD REVISED
Given the above set of adapters, one good 25' #12AWG extension cord with a L6-20 plug and socket should suffice for just about any eventuality, as this can be used for both 240vac and 120vac. Although I've had a couple of situations whereby I ran a 100' extension cord from a dryer outlet in the back of the house, this is so rare as to not merit carrying around the weight and volume of such a cord. Disclaimer: check the wire rating to ensure it can handle at least 300vac. It is ok to use 240vac connectors for 120vac but not ok to use 120vac connectors on 240vac. This modifies my previous suggestion of using a 120vac extension cord for 240vac.
I have one that's 20' long and have used it a number of times, primarily to plug into a public station that was ICE'd or occupied by a BEV/PHEV that had finished charging, but also useful when curb-charging the Tesla (and Volt and Bolt) which have their power inlet located on the driver's side. Without endorsement, here's an example of one such extender:
Tesla UMC and HPWC J1772 ADAPTER (240vac NOT SuperCharger)
I bought one for my i-MiEV as it allows me to utilize my two Tesla EVSEs (UMC and HPWC). With the proliferation of Tesla High Power Wall Chargers (HPWC) around the country at hotels, restaurants, and (especially) wineries, this is a handy 240vac adapter to have on long trips. Again, without endorsement, here's an example -
It's my understanding that such an adapter may not be compatible with the latest version of Tesla's HPWC. Proper etiquette would be to both ask at the desk to be able to use that EVSE and also leave a note on the windshield should a Tesla show up. If anyone locally wants to borrow mine to take on a trip, you're welcome to it.
Oh, and here's my personal list of all my adapters. I keep updating it with the same link as I acquire more... this is a hodge-podge lifetime collection, many adapters which I would not make if I were starting from scratch.
Well, that's my first shot. I'm sure I left something out...