Bill, there are some good pix Here
that show a pin & sleve arangement with the disco which would be required. Note the 'ring' , probably not a good pix (PDF), but it will thread onto the inlet/disco.
Most disco's have a lockout mechanism, i.e.- you need to power it down to take it apart..
agree, the language reads hard, even the next sentence......
(b) Receptacles rated for 60 amperes or 100 amperes shall be of the pin and sleeve type.
......leaves one wondering if pin & sleeve of other ampacities are compliant.
[This message has been edited by sparky (edited 02-02-2002).]