I was quite sure that this wont work, but we have been forced to try.. Not that much..
Normally the LAN is got over FTP and UTP cables, aka the twisted ones.. Yeah, the twisted wires.. Or even twisted pairs of twisted wires.. Cat6e has 6 twists per inch..
But using old 12 x 1.5mm² AC mains cable with no twists which is 20 to 30 meters long, is under ground and dated to late 70′s or 80′s must fail..or..?
why this could work?
1st: i used only 10Mb/s mode
2nd: we were totally lucky
update 2/2017: i will be finishing this project soon!