I saw a brochure outlining the use of the Crouse Hinds Cam-lok connectors http://www.tmb.com/Pdf/Cam-Lok.pdf
I was wondering if there is any restriction on where they can be used and who can connect equipment using them?

I looked at a 315 amp connector and noted that you could touch the brass pin and socket with your finger when the plug was apart.

The other worry I have is even though the connectors are colour (Australian Spelling) coded they are interchangable. So that a green plug can be plugged into a red socket.
Or an earth connection could be inadvertantly left off.

So when these connectors are used, is there a stipulation to ensure only licensed electricians can use them?

I have personally only seen these connectors used once here in Aus are they in common use in the states?