Auto Transfer Switch ATS transitions in Data center: A R&D Telecommunication and POP Internet Company had reported an UNUSUAL PROBLEM of Data Center Blackout, which infrequently, and out-of-the-blue, blacks out its entire data center load. In-addition, it had reported multiple incidents of alternator winding failures with its emergency DG. An inquisitive engineer always wondered why the Auto Transfer Switches are so overdesigned. Well, the answer lies in the "Waveform-and-RMS View" of this case study, as enclosed in the caption picture above.