Bank's High 9s Infrastructure Saved from Disaster The power system for this major NYC bank providing nationwide credit card and other financial transactions appeared to be performing satisfactorily. Fortunately, the proactive monitoring approach employed in this facility identified a power quality trend that could have caused a catastrophic failure. Non-symmetrical waveforms rich with even order harmonics indicate a problem in the power system. The problem was identified as a partial rectification by the UPS of the AC power instead of a full rectification. The UPS would have failed if the system had switched over. While the bank did not experience any overt power quality problems, monitoring at the input and output of three separate UPS systems identified non- symmetrical waveforms and a t

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