Artsci, this is an ingenious solution. I am in a similar situation with my townhouse co-op board, they are willing for me to put in a charging recepticle, but are coming up with concerns of liability if someone (ie, kids) have any possible access to a 30amp outlet (which is what I can run from my townhouse). I would love to put in a nice bollard like the one you have, but am not handy enough to make one myself and utility bollards are very expensive.
So my idea was just to put in a lockable outlet cover that would be locked whether the UMC was plugged in or not. I think they will go for this. My only question is whether the UMC outlet plug will fit inside the cover. I am not receiving my Model S until May/June and don't have a good idea of the size of the UMC outlet plug end. Would the cover fit the UMC plug with NEMA 14-30 adapter?
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I think this is a good solution. Where will the outlet cover be placed?
FYI the depth of the plug from the surface of the receptacle to the back of the cord after the right angle bend is 4.25". This is the depth between the receptacle surface and the cover back that you'll need. If that's not enough you can probably heat the cover to the point where the plastic softens and make it deeper.
Here's a photo of the UMC.