"Permanent extension cord" was an attempt to put "flanged inlet + cable + interior receptacle" in short words. It is permanently installed with suitable wiring materials but basically serves the same purpose as an extension cord threaded through a hole in the wall.
JValdes - the application note explains with great clarity the most frequent code compliant and non-compliant set-ups w.r.t. bonded and floating neutral configurations that involve a 2 or three leg transfer switch. I often see three pole x-fer switches used erroneously because the client believes that neutral MUST be switched.
