Going off on a slight tangent - would UK style open-PEN units work reliably on the Indian system? Most work on the assumption that the L-N voltage is within UK ESQCR limits and if it drifts out of that will trip out presuming a PEN fault. UK limits are between 216.2V and 253V at the supply - with open PEN units tripping out if the voltage goes outside 207V...253V which allows for some normal voltage drop within the installation. I gather that the Indian spec is for down to 207V at the supply so even in a compliant installation it could well be a lot lower than 207V at the charge point - risking a lot of false tripping. Some have even suggested that in practice Indian supplies might not always be entirely compliant with specifications either.
