This standard applies to low-voltage fuses rated 1000 volts or less, ac and/or dc, with interrupting ratings up to 200 kA. These fuses are intended to be used in accordance with the Canadian Electrical Code, Part 1 (CEC), and the National Electrical Code, NFPA 70 (NEC). UL 248-1 provides the general requirements for fuse characteristics marking, construction, and tests pertinent to all the subsequent parts, Additional requirements - such as dimensions, 1 t limits, and the like pertaining to the various families of fuses are given in the subsequent parts. The subsequent parts supplement or modify the corresponding requirements in Part 1 and must be used together with part 1.