wa2ise, very well said... a 4-wire circuit is still a "circuit", and one would consider it common sense to apply like loads, not say sensitive AV equip, and HVAC. Or a MIG welding rig and an HDTV... Thats just crazy talk! [Linked Image]

Anyway, I'm with Bob on this... It is still there at the panel and service. You could even inheret problems from the building next door... Short of a seperate transformer or the like, you really can not get rid of, aleaviate the voltage portion of harmonics, surges or spikes off the system. The benifit of a 2-wire is that you will reduce the chances of voltage drop related issues due to load, and current portion of harmonics to a greater degree, but even they are still present at the panel although to a lesser degree.

Mark Heller
"Well - I oughta....." -Jackie Gleason