I guess I should not hold any real preference for NEMA plug configurations. Of all the designs they have for many voltage, system, and amperage configurations, there's only one pairing that is compatible between 120/240 and 240 volt systems, and that's 6-15 vs. 14-15 (e.g. a 6-15P will plug into a 14-15R). Maybe I'll write more some day on how a smart system could have been designed.
