Hey Bob,
I'm just wondering?
Do the US receptacles of these type, have an Inter-locking mechanism in them?
As in, so that you can't attach or remove the plug, unless the supply is turned off?. [Linked Image]
These sorts of connectors are expensive anywhere, I think, I was recently quoted NZ$350 for a set like this, the guy I was doing the job for nearly died!. [Linked Image]