I am putting together a wiring harness schematic for outsourcing to reduce company labor costs, and we adhere to strict electromagnetic radiation standards. One of the techniques we use to reduce EMI is twisted pairing for cancellation.

I'm curious, though, is there a standard for the ratio of twists per some measure of length? For example, 2 twists (two complete loops) per inch? How much of a difference does the frequency of twisting have on the EMI? Can you twist too much? Any details would be appreciated.

Thank you!