Preface:

This is the harmonized CSA Group and UL standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures for Use with Photovoltaic (PV) Systems. It is the First edition of CSA C22.2 No. 305 and the First edition of UL 489B.

Scope:

1.1
These requirements cover molded-case circuit breakers, molded-case switches, and circuit-breaker enclosures rated up to 1500 V dc, intended for use with photovoltaic (PV) systems and Ref. No. 1 of Annex B.

1.2
These requirements are intended to be used in conjunction with the requirements in Ref. No. 2 of Annex B, except as modified or supplemented by this Standard.

1.3
These requirements do not cover molded-case circuit breakers or molded-case switches intended for use in battery circuits.