ABSTRACT: This document replaces TA-NWT-001011.

This Technical Reference (TR) covers generic requirements for Surge Protective Devices (SPDs) on AC power circuits that in the view of Telcordia are needed for proper service and maintenance performance. The SPDs are intended for indoor use at the service entrance location, installed on the load side of the AC power service disconnect, operating at rated voltages of 600 Vrms or less, for single-phase or three-phase systems.