When designing and fabricating long-lasting induction systems it is important to consider the electromagnetic field in the immediate vicinity of the inductor. The use of low-resistivity nonferrous materials (preferably electrically non- conductive) in the area close to the inductor is recommended. Fasteners and washers used to connect bus-work to the inductor should also be nonferrous and preferably nonconductive. The rule of thumb: Ferrous materials should be located at least one coil diameter away from the coil. More precise recommendations can be obtained by using computer modeling.