Hi, this is my first post then i want to share you a completely jpg to svg restored electric diagram that I made on inkscape; I added few more icons and info from the original one.;Everyone is free to use or modify.
A3 pdf format
http://drive.google.com/open?id=0B8Vkept8gBQhNGtzSUxvVGNCclE
SVG file
http://drive.google.com/open?id=0B8Vkept8gBQhRmk0ZlpITkNLZVE
i hope is gonna be useful. :thumbup: