Interesting point about the Ideal tester. . .I've never used one, but as you say it, it is obvious to me that the electronics in the device would be comparing no load voltage to load voltage, and this would be the drop through the total impedance back to the transformer. Thanks.
Sorry about the 80% thing. That's a red herring. I'm trying to describe a non-specific circuit with luminaires and receptacles that would be calculated through 220.3(B)(10) which flips back to 220.3(A). I've been taught that (in dwellings) the 180VA / outlet figure does not apply for this circuit, and that, in fact, there is no maximum number of outlets.
You're right, 81 feet is rediculously short. The more I think about this, the shorter the distance gets.
