I don't know if I should ask this question here but it is related.
The other day a friend who is renovating a hospital OR theatre was commenting on the voltage found on the isolated or "floating system". It all made sense. He was getting 60V from L1 to ground and 60V Neutral to ground (or I guess you could call it L2).
After our conversation I was thinking about my Hammond 120:120 isolation transformer that I use to energize devices under test with my scope. I plugged it in to a standard wall outlet that measured 123 V. Then I measured the secondary of the Hammond transformer via the standard female cord end. I found approximately 120 V from L1 to Neautral, 72 V from L1 to ground, and 20 V from Neautral to ground. The last two measurements do not add up to 120 V. Where did the other 28 V go?
