Actually there are some configurations that are not used any more. 2-15, 2-20, and 2-30 are basically unheard of anymore. 1-15 plugs are very common. 1-15 receptacles can still be found in older instalations but are becoming more rare. As for the other 2pin connectors, ouside of a few combination 1-15/2-15 recepticals I have never even seen any. There are also a few more nonstandard proprietary connectors that are not shown, yet are still seen commonly in industry. Hubbell's Hubbelock is one example. You see it used in hospitals for portable Xray machines and in a few industrial settings.
[This message has been edited by IanR (edited 10-18-2005).]
