These requirements cover enclosed and dead-front switches rated up to 1000 V dc@ intended for use in dc photovoltaic (PV) systems and installed in accordance with Article 690 of the National Electrical Code@ ANSI/NFPA-70. These switches are intended for ambient conditions between minus 20 to +50?? These requirements are intended to be used in conjunction with requirements in the Standard for Enclosed and Dead-Front Switches@ UL 98@ except as modified or supplemented by the following requirements. Unless otherwise specified@ when the term switch is used in this outline@ it refers to a photovoltaic enclosed or dead-front switch. Fusible switches are intended for use with photovoltaic (PV) fuses which comply with the requirements of Outline for Low-Voltage Fuses ?C Fuses for Photovoltaic Systems@ Subject 2579.