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I see -- so you're ignoring the ground, which is why you use GFCI outlets. What do you physically do with the ground? I currently have a cable (12/2 + ground) run from my breaker box to power my amps. The ground in the cable is connected to the ground on the outlets. I could run 12/2 without ground, but I'm not sure they even make this cable, or do they? If you have a ground running to where you want to install the transformers, what do you do with the ground? You can't connect it to the box, as that wouldn't meet code.
Ohenry - The reason for suggesting a GFI has to do with the nature of most of our components. Typically, the neutral line is neither fused no switched within a component. (on all my own DIY projects I'm now using an IEC inlet with dual pole switch and fuses, $1.49 from apexjr.com.) Unbalanced mains do not have power flowing on the neutral, and assuming proper wiring of the mains outlet, this is not problematic. But after balancing we now have 60VAC on that neutral line and 60VAC (antiphase) on the hot line. ...
I hate to appear totally thick, but I often overlook the obvious.