There was mention earlier about the various electrical systems on some of these aircraft. A simplified version of many of the airliner systems is available on the web.
B777 Electrical
http://www.smartcockpit.com/aircraft...Equipment.html
These are for study purposes and are generally 'dumbed down' versions of the schematics found in the engineering and crew training manuals.
They do give a good indication of the system layout you would expect to be seeing though.