Abstract: More frequent use of variable frequency drives requires that the interaction between the drives and the power line be considered in order to avoid undesirable power line effects caused by the drive. In addition, the power line characteristics need to be defined by the drive manufacturer which assure proper operation of the variable frequency drive. The potential effects the drive has on the power line is discussed, including line harmonics, line notching, and line noise. General approaches for minimizing effects and installation guidelines are also reviewed.