Shortcircuit UL calls a cord cap an attachment plug.
2002 UL White Book
ATTACHMENT PLUGS, FUSELESS (AXUT)
Attachment Plug â€” A male contact device for the temporary connection of a flexible cord or cable to a receptacle, cord connector, or other female outlet device.
Notice they specify flexible cord.
They also describe the terminals.
Terminals â€” Terminals of appliance couplers, appliance and flatiron plugs, attachment plugs, cord connectors and table taps are intended for use with stranded copper conductors of the type used in flexible cord.
And from the NEC
110.3 Examination, Identification, Installation, and Use of Equipment.
(B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.
We can not use equipment in a way that it was not intended to be used.
[This message has been edited by iwire (edited 07-17-2004).]