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..
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..