UL 98B PDF

1.1 These requirements cover open, enclosed and dead-front switches rated up to 2000 V dc, intended for use in dc photovoltaic (PV) systems and installed in accordance with Article 690 of the National Electrical Code, NFPA 70. These switches are intended for ambient conditions between minus 20 to +50 °C.

1.2 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.

1.3 Unless otherwise specified, when the term switch is used in this outline, it refers to a photovoltaic, enclosed, open, or dead-front switch.

1.4 Fusible switches are intended for use with photovoltaic (PV) fuses which comply with the requirements of the Standard for Low-Voltage Fuses – Part 19: Photovoltaic Fuses, UL 2579.

1.5 These requirements also apply to open type switches, used in conjunction with the Outline of Investigation for Open Type Switches, UL 98A.

1.6 These requirements also cover fused and unfused electrically tripped PV switches.