Twisted pair for mains AC load wiring?
There is a great paper on this written by Bill Whitlock of Jensen Transformers.  He found that twisting the line and neutral pair 5 twists per foot and running the ground in parallel reduced the induced noise on the ground wire by over 1000 compared to the worse case scenario, so I think your idea of twisting the power conductors is valid as ground noise was dramatically reduced.  Please see paper referenced here: http://www.jensen-transformers.com/wp-content/uploads/2015/02/AES-Ground-Loops-Rest-of-Story-Whitlock-Fox-Generic-Version.pdf