While technically obsolete the 10-30 plug is still in millions of houses and you can still buy them. The ground is shared with the neutral but in your case you won't be using the neutral so that wire/pin will just be used for ground. While ground and neutral are generally separate at the outlet and wiring, they both attach to the same point inside your electrical panel, they are bonded together. If your not comfortable with that then just do as wwhitney said and use a 14-50 plug/outlet. Note if using a 14-50 outlet without a neutral you might also run into code issues. The 14-50 is supposed to have a netural and if you don't wire one and then someone down the line plugs in something requiring a neutral.....A better option for EVSE use is the 6-50 which lacks a neutral, unfortunately, very few EVSEs use that more fitting plug as the 14-50 is more likely to be found in peoples homes.bigedgar said:Thanks for all the info in this thread, everyone. I've been investigating the same 240v / 16amp Duosida unit that others have. My only issue is around the plug options. At the location where I intend to use this, I have a 240v / 30 amp circuit available (served by two hots, a neutral and a ground). These EVSE units seem to typically come with a 10-30 or 6-20 plug, and I've also been offered a 14-50 plug. But there are issues with all the plug options:
2. 10-30 plug: As far as I understand, most 240v EVSEs have two hots and a ground - no neutral. 10-30 receptacles have two hots and a neutral. So I don't understand how the 10-30 configuration is electrically sound. Does it bank on the neutral in the 10-30 receptacle being bound to the earth-ground back at the panel? If so, that seems a little risky, as my understanding is that the neutral wire is always capable of back-feeding electricity.
4. 14-50 plug: See #1 (can't have a receptacle that doesn't match the amperage of the circuit). I suppose I could order it in this configuration, and then remove the 14-50 plug and just re-wire a 14-30 plug onto it.
alozzy said:This one is a universal adapter from 14-50R to 14-xxP, cool!
https://goo.gl/SrffQP
TonyWilliams said:alozzy said:This one is a universal adapter from 14-50R to 14-xxP, cool!
https://goo.gl/SrffQP
That is dangerous and dumb. So, anybody can easily plug in a 50 amp load into potentially a 15, 20 or 30 amp circuit.
Dumb, dumb, dumb.
rmay635703 said:TonyWilliams said:alozzy said:This one is a universal adapter from 14-50R to 14-xxP, cool!
https://goo.gl/SrffQP
That is dangerous and dumb. So, anybody can easily plug in a 50 amp load into potentially a 15, 20 or 30 amp circuit.
Dumb, dumb, dumb.
Our motor home had one of those included, pretty easy concept, everything was fine unless you tried to run both air conditioners at the same time then the breaker tripped.
It's not like tripping the breaker because you forgot was some type of life and death experience .
Just reminded you to only run one appliance at a time.
The table you are referring to is 210.21(B)(3), which only applies to "a branch circuit supplying two or more receptacles or outlets".bigedgar said:but then it goes on to say "and shall comply with 210.21(A) and (B)" - which are tables that basically indicate that only a 30 amp receptacle is acceptable for a 30 amp circuit.
nr427 said:You could get the evse with the 14-50 plug and cut off the unused neutral pin then it would plug into 14-30 wall outlet just fine. This would be cheaper than swapping plugs and you could still use it on the road with rv outlets.
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