UL 489B:2014 free download Outline of Investigation for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures for Use with Photovoltaic
1 Scope
1.1 These requirements cover molded-case circuit breakers，molded-case switches, and circuit-breakerenclosures rated up to 1500 v dc, intended for use with photovoltaic (PV) systems and Article 690 of theNational Electrical Code,ANSI/NFPA-70.
1.2These requirements are intended to be used in conjunction with the requirements in the Standard forMolded-Case Circuit Breakers,Molded-Case Switches and Circuit-Breaker Enclosures, UL 489, hereafterreferred to as UL 489,except as modified or supplemented by this Outline.
2 Components
2.1 Except as indicated in 2.2, a component of a product covered by this Outline shall comply with therequirements for that component.
2.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this Outline; or
b) ls superseded by a requirement in this Outline.
2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions,such as certain temperatures notexceeding specified limits,and shall be used only under those specific conditions.
3 Units of Measurement
3.1 Values stated without parentheses are the requirement.Values in parentheses are explanatory orapproximate information.
4 Undated References
4.1 Any undated reference to a code or standard appearing in the requirements of this Outline shall beinterpreted as referring to the latest edition of that code or standard.
5 Glossary
5.1 For the purpose of this Outline, the following definitions apply.
5.2PHOTOVOLTAIC (PV)MOLDED-CASE CIRCUIT BREAKER – A molded-case circuit breakerintended to operate in a photovoltaic (PV) system to provide branch circuit overcurrent protection.5.3 PHOTOVOLTAIC (PV)CIRCUIT-BREAKER ENCLOSURE – A circuit-breaker enclosure intendedfor use in a photovoltaic (Pv) system.
5.4PHOTOVOLTAIC(PV) MOLDED-CASE SWITCH – A molded-case switch intended to operate in aphotovoltaic (PV) system to provide disconnecting means.
MOLDED-CASE CIRCUIT BREAKERS
cONSTRUCTION
6 General
6.1 The construction of a PV circuit breaker shall comply with the requirements as specified in Section6.1 of UL 489,except as noted in Sections 6 – 8 of this Outline as applicable.
6.2 PV circuit breakers shall be considered as single poles for individual PV sources or strings that mayuse multiple sets of contacts in series, unless marked in accordance with 17.5.See also 9.8.
7 Spacings
7.1 The electrical spacings for PV circuit breakers rated 6o0V or less shall meet the requirements ofSection 6.1.6 of UL 489.Those PV circuit breakers rated 601 – 1500V shall meet the requirements of UL489 for 6oov.
UL 489B:2014 free download
