A friend of mine recently asked if I could take a look at his Monster brand power filter that wasn't working and I noticed it splits the power so, what normally would be neutral and hot, legs are split to carry 60VAC each. I think I've seen this on all the UPS's I've measured as well. Anybody have some insight on why this split/balanced configuration is used? There must be some advantage? Also.....I've come to notice, when this Monster filter and some of the UPS's I've measured in the past seem to keep supplying 60VAC to the legs after the device is off. Measuring between hot and neutral reads 0V but ground to either leg reads 60VAC. Two legs in phase with each other? This seems like a bit of a dangerous setup, any thoughts on why this would be done?