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 I don't have a garage (that isn't full of bikes and tools).  My electrician will only install outdoor charging stations as hardwired, and the OpenEVSE store will only sell charging units with a short, input cable with a plug on the end. 

Also this which means my 48 amp unit should be hardwired anyway (and OpenEVSE should be selling a hardwired option with various input cable lengths).

The electrician is already unsure about a "home-grown" device like this, so I'd rather not ask him to open it up to install his own cable.  Thus, I need to find a source for compatible outdoor-capable, round (to fit the gland) lead cable sold by the foot. 

Has anyone else had to do this, and where did you get the cable?

Thanks.

 Never mind.  The electrician was willing to run a cable from the electrical panel to the OpenEVSE box and replace the plug-ended supply cable themselves.  I wish that had been explained as a normal thing.