Abridgment of formula for minimum horizontal spacing of transmission line conductors as affected by danger of contact in the span

The present contribution is for the purpose of deriving a logical formula to be used as a guide in the determination of the minimum safe horizontal spacing of transmission line conductors, and is offered for discussion. By minimum safe horizontal spacing is meant the least spacing that will insure safety against short circuits between conductors due to their swinging together out in the span, under the influence of wind or ice, and has no relation to the separation of conductors transversely at the towers, as required for securing the necessary clearance to the tower structure. The latter separation is usually controlling, but a number of cases occur where the getting together in the span requires a wider spacing, such, for example, as long spans or two circuit horizontal arrangements of conductors.