a refractory guide member and a method for heating the refractory guide member by use of an inductor , where at least one collateral electromagnetic field located in a region spaced apart from the inductor is generated by the inductor . the mold part is made of an electrically conductive layer with several insulating interrupting slots for the controlled deflection of eddy currents from a main field generated by the inductor into a region spaced apart from the inductor .