Cable directionality

Bigtee wrote: "As I said before, you have the positive half cycle and then the negative half cycle that "Flows" the opposite direction on the same wire."

Correct, the current alternately flows in what I like to call the "forward" wire, but the inverse of that current also flows simultaneously in the second wire, which I call the "return" wire. In most AC power systems, this is NOT the ground wire, because this would violate electrical code, regardless of whether the circuit is single-phase or three phase.

Bigtee wrote: "On the output of the secondary, one side is tied directly to earth ground and also serves as the common for the wiring activating all the small 24VAC coils on relays. The other runs to the other side of the coils."

If this is the case, then for these internal circuits, the ground is used as a return path for the current. It would be difficult to measure any voltage drop across a grounded chassis, because the impedance is so low.

I actually worked as an industrial electrician apprentice while I was going to college 27 years ago, so I have some experience with electrical code, 3-phase, contactors and transformers etc..

Audioengr-
I appreciate your information and trust me, I will get a handle on the "Why." I think we have been engineers for about the same length of time. I graduated a ME in 1975. I didn't learn much about electricity in school and have been in industrial design for a long time. We have electrical guys in our group that handle the biggest portion of the electrical work, naturally. I do design air conditioning control systems working closely with general contractors. I have always understood the codes and the wiring requirements but never researched the "Why." I guess now is a good time to start. I have been playing with audio equipment since I was about 12. Never had any electronic training but understand how it works somewhat. I have built some really decent sounding interconnects but don't have a clue to why they turn out as they do. I have played around with the metals and the shield schemes. I have found, keep them as short as possible and for whatever reason, I find solid wire better than stranded. I have never been able to detect any direction inconsistancies in the wire.

Here are some more tips for you, since I design wires for my company:

1) interconnects should be low capacitance - this means spiraled pairs of small gauge wire that are spaced-away form each other. Use Teflon or air-filled dielectrics to separate and insulate them.

2) Speaker cables should be low inductance and low resistance. To get low inductance, you need coupling, so make many twisted-pairs of 20-24 gauge wire and then connect then at the ends to for a single circuit.

I had a breakthough, The arrows (directionality notation)are so you can see which way the signal goes when you are wading through your orgy of interconnects behind your AV rack without having to trace each one back to where it comes from or goes to.

-Phil

Works for me....