ELECTRICAL appliances, machines, instruments and systems must work properly in their environment, implying that not only must they not be too susceptible to electromagnetic interference (EMI), but also that they must not interfere with the working of other electrical equipment. This fitness in the electromagnetic environment is called electromagnetic compatibility (EMC). As the number of electrical products of all kinds is rising exponentially and as new electrical applications are found daily the problem of EMC has assumed greater and greater proportions. Many standards for EMI have been issued, a few of the more important for the UK and the EC being those in table 28.1.
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