Formulas for calculating the inductance of channels located back to back

IN 1937 Arnold
¹
published an analytic procedure enabling the designer of a single-phase 2-conductor bus to determine combinations of conductor spacing and cross section that render proximity and skin effects (a-c resistance, eddy-current losses, and current density distortion) a minimum. For explicit details the reader is referred to Arnold's paper. For our purpose it suffices to remark: 1. In general the designer is afforded an unlimited number of combinations of conductor spacing and cross section.