ABSTRACT
This chapter suggests that the National Electric Safety Code (NESC) has been adopted in other countries. The stated purpose of the NESC is the “practical safeguarding of persons during the installation, operation, or maintenance of electric supply and communication lines and associated equipment.” The basic clearance or strike distance from the conductor to tower side, arm, or truss specified by the NESC is 75 mm plus 5.0 mm per kV of maximum system voltage exceeding 8.7 kV. Working clearances in stations and lines meet the objective of the NESC, i.e., “practical safeguarding of persons during the installation, operation, or maintenance of electric supply and communication lines and associated equipment.” Altitude correction factors are in need of coordination throughout the NESC. In addition, as in apparatus standards, the assumption is made that no correction is necessary for altitudes below 1000 m or 450 m.
