Rich Grise writes:
http://www.voltec-industries.com/nema_chart.html
https://www.hubbellnet.com/max_htm/t...EMA/front.html
http://nooutage.com/nema_configurations.htm

Here's the one I use:
http://www.quail.com/nema.cfm

But yeah, TWO types of outlets? Come on, my house has way more than
just TWO types. Heck, I have at least two types of just 120v outlets.
I think I have four types of 240v outlets.