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Please find below a selection of relevant articles from AEC companies and organizations for utility sources. ANATOMY OF A UPS ...known to damage the input harmonic filters of UPS systems causing an entire system meltdown. Some variations of the standard UPS shown in the diagram include dual input from two utility sources into the same UPS and external maintenance bypass, also using dual power supplies for the connected load. Obviously, both of these power paths must be protected. See #1. 1: http://www.mcgsurge.com [c864851]