I will agree that the level of current harmonics and their voltage distortion effects in data center circuits have been reduced over the pase few years. I also agree that the tripplin harmonics that cause neutral overloading is not as severe as it once was. That being said, I will continue to recommend against the use of multi phase branch circuits that rely on a common neutral. My recommendation is to always use a dedicated neutral for each 120 volt single phase brance circuit There are several reasons for this. One is for ease of maintenance and maninuplation of circuits as data center equipment is changed. upgraded etc. Another is to reduce the chance of any interfearance on one circuit affecting another. Another is that a loose connection on one neutral conductor will not affect another.
Larry LeSueur Larry LeSueur
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