controller is not. The net effect we have a motor system that is very sensitive power quality. Another is that difficult to grasp factor that makes power quality issues is that in some instances electrical equipment causes its own power quality problems Such a problem might not be apparent at the manufacturing plant; however, once equipment is installed in an unfriendly electric environment the problem could and performance suffers. Given the nature of the electrical operating bound and the need for electrical equipment to perform satisfactorily in such an nvironment, it is increasingly necessary for engineers, technicians and facility perators to become familiar with power quality issues. It is hoped that this book ill help in this direction