Here is a copy & paste from the 2008 NEC which is unchanged from the 2002 & 2005 editions.
314.27

(C) Floor Boxes. Boxes listed specifically for this application
shall be used for receptacles located in the floor.

Exception: Where the authority having jurisdiction judges
them free from likely exposure to physical damage, moisture,
and dirt, boxes located in elevated floors of show
windows and similar locations shall be permitted to be
other than those listed for floor applications. Receptacles
and covers shall be listed as an assembly for this type of
location.

This is my opinion, but that receptacle in the picture does not meet that exception.