Span 01 : (1) Refers to the distance between two poles of a transmission or distribution line. (2) The algebraic difference between the upper and lower values of a range
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}