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31 IEEE Std 1100-2005 CHAPTER 3 generally recognized and accepted. In the meantime, terms used by different authors might have different meanings, leaving on authors the burden of defining their terms and leaving for readers the burden of being alert for possible ambiguities. One example of such ambiguities occurs when attempting to summarize data from different surveys. For instance, two surveys have been widely cited (Allen and Segall [B1] and Goldstein and Speranza [B7]); each was aimed at defining the quality of power available for the equipment of concern to the authors.

It would not be economically feasible to detect and filter each small source of harmonics or to isolate each susceptible load from all power line disturbances. A more practical approach is to control harmonics by agreement on limits for emission levels with filters installed on major offending loads, while defining an acceptable susceptibility level for equipment. Unusually susceptible electronic equipment may be supplied by special power conditioning interfaces, external to, or incorporated with, the equipment.

In a similar way, a triac may be turned on by a voltage surge without damage, but still fail by exceeding the peak power limit during a surge-induced turn-on with slow transition time. d) Power conversion equipment nuisance trip An example of this is a front-end dc link where the filter-capacitor voltage can be boosted by a surge, resulting in premature or unnecessary tripping of the downstream inverter by on-board overvoltage or overcurrent protection schemes. e) Data-processing equipment malfunction In this case, the malfunction (data errors), not damage, may be caused by fast rate of voltage changes (capacitive coupling) or fast rate of current changes (inductive coupling) that reflect the initial characteristic of the surge event.

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