Abstract: An apparatus for effecting inductive coupling among a plurality of electrical elements includes: (a) an electrically non-conductive core member oriented about an axis; (b) at least one first electrical element of the plurality of electrical elements substantially nestingly surrounding the core member oriented about the axis; each respective first electrical element being in spaced relation vis-à-vis other first electrical elements in an installed orientation; and (c) at least one second electrical element of the plurality of electrical elements disposed in surrounding relation with respect to the core member about the axis sufficiently proximal with at least one selected said first electrical element in the installed orientation to establish the inductive coupling.