scope:

This application guide applies to ac highvoltage circuit breakers rated in accordance with the methods given in American National Standard Rating Structure for A C High-Voltage Circuit Breakers, C 3 7 . 0 4 - 1 9 6 4 ( R 1 9 6 9 ) and listed in American National Standard Preferred Ratings and Related Required Capabilities for A C H i g h - V o l t a g e C i r c u i t Breakers, C 3 7 . 0 6 - 1 9 7 1 . Circuit breakers rated and manufactured to meet other standards, or used in switchgear assemblies, should be applied in a c c o r d a n c e with application procedures adapted to their specific ratings or applications

Purpose

This guide is intended for general use in the application of circuit breakers. Familiarity with other American National Standards applying to circuit breakers is assumed, and provisions of those standards are indicated herein only when necessary for clarity in describing application requirements.