In Square D's marketing copy for their plug on neutral load centers, they have a photo for demonstrating "cleaner wiring" in which the hot and neutral wires are twisted inside the panel before reaching the breaker. I agree it looks neater, but it got me thinking and I know just enough about electricity to be confused. I assume the practical answer is that a slow (~1 turn per inch) human-made twist in the last couple feet of a cable that runs 30-40 feet will have no real impact, but I'm curious.
In low-voltage DC data wires, twist is used to reduce emitted EMI and reject received EMI. In a typical home I doubt contractors care about the noise on the voltage line, but as someone with a lot of sensitive electronics it interests me. But I've also seen it suggested that the increased capacitance between the twisted wires could increase current drain, which in turn could cause nuisance trips of AFCI breakers.
And I pretty much only understand electricity at all in DC. I don't know or understand what impacts AC may have on this.
So what kind of impacts, if any, could we expect to see from twisting a previously parallel load/neutral pair, carrying 120V AC?