Revision Standard - Superseded. The main emphasis of this recommended practice is the engineering design of optical fiber communication facilities serving, or connected to, electric supply locations. This document includes methods for providing telecommunication facilities serving electric supply locations using optical fiber cables, and their related electronic systems, extending across the zone of influence (ZOI). (IEEE Std 1590-2009 in its entirety, was replaced by IEEE Std 487.2 and IEEE Std 487.3.)