UL 248-21 PDF

1.1 This Part is intended to be read together with the Standard for Low-Voltage Fuses – Part 1: General Requirements, hereafter referred to as Part 1. The titles of the Clauses in this Part correspond to the similarly titled Clauses in Part 1. The requirements of Part 1 apply unless modified by this Part. For the Part 1 requirements, refer to the Standard for Low-Voltage Fuses – Part 1: General Requirements, NMX-J-009-248/1-ANCE / CSA C22.2 No. 248.1 / UL 248-1.

1.2 This Part applies to fuses for the protection of batteries and battery systems rated 2000 V dc or less.
NOTE: CSA C22.1, Canadian Electrical Code, Part I, defines low voltage as any voltage exceeding 60 V dc but not exceeding 1500 V dc inclusive, and high voltage as any voltage exceeding 1500 V dc The National Electrical Code, NFPA 70, defines high voltage as more than 1500 V dc, nominal.