MikeD wrote:techiefan: Your response to me seems accurate and useful, thank you! Since you mentioned using a non-metallic box for your receptacle it occurred to me that your installation could be improved safety-wise (especially for the period without a GFCI breaker), assuming the only part of the receptacle's installation that was touchable AND grounded was the metal cover, if you could replace that cover that a non-metallic one. The trouble is I haven't been able to find one(!?), either for a 1-gang or 2-gang box -- but I could create one by cutting a 2 in hole in a plain non-metallic cover (like Hubbell/Bell PBC100GY). I commend you for your original post's thoroughness and usefulness, BTW!
Because a good 14-50R receptacle makes a tight fit with the plug, it can be very hard to unplug without using two hands -- one pushing on the cover and the other pulling on the plug. If you only pull on the plug, I can see where a plastic cover might break (crack at the 4 holes) if it is only secured by the 4 screws that pass through the cover (and not the two additional screws that may be available at top/bottom center that do not pass through the cover). Perhaps this accounts for only metal covers being available for use with 30 and 50a receptacles...
I used a plastic box and actually mounted it next to the stud with adding a screw from the side to secure it beyond the plastic tabs so it can't be yanked out. However the metal plate is grounded because the outlet metal frame is grounded by design and when attached with the 4 metal screws it makes bond. If I used a metal box the only difference would be the metal box would need to be grounded as well, wouldn't change anything safety wise. Really GFCI and safety in the way I am using my EVSE charger is not much of a concern for me as I am in full control but since we are posting on an open we should always call out things to ensure others are safe.
One note is that you have to use a 2 gang box with 6 AWG wire due to size and needing for the additional space to accommodate it.
In Canda they readily sell the plastic covers as all in one but I suspect they are not approved for USA use.
Hope these posts help others and again I say make sure to follow all NEC codes and if one has any questions call the town / city with concerns or questions on current code. Sometimes going into the local office and talking with the local inspector will yield better results, they usually don't discriminate against non licensed electricians asking questions. Garage car charging (EVSE) is a fairly new area anyway, it's not something that's been around that long. Also remember that when you open a permit, it's inspected prior to passing, if you haven't followed code you will need to fix it in order to pass, the inspector will tell you what needs to be done to be compliant. Now many homeowners often don't open permits for small work like an outlet but those are the rules in many areas, if one chooses to follow or not is up the individual like speeding.
In case anyone wants to read the NEC 625 rules for EVCShttp://www.electricallicenserenewal.com ... onID=366.0
Happy EVSE charging to all!