Discussion on “standardization of enclosed fuses”

Here on the table is a complete line of the standard enclosed fuses adopted by the Underwriters National Electric Association. The collection shows clearly what has been accomplished in regard to interchangeable features. Instead of this one table half covered with fuses, it would have required at least five such tables to hold all the enclosed fuses of these exact capacities which were in the market a year ago. Thus the number of fuses has been reduced about nine-tenths. To make all enclosed fuses of any given capacity interchangeable in the cut-outs, regardless of the make or date or place of purchase, was the object constantly in view, so that they might be as interchangeable, for example, as ordinary standard pipe-fittings. In order to make the cartridge type of enclosed fuse as interchangeable as possible in the Edison plug cut-out, which was adopted as part of the standard, fuse casings have been made which will receive the cartridge fuses, and can then be screwed into the plug cut-out. With these cut-outs thus equipped with casings, it is certain that the standard cartridge fuse, up to 60 amperes, at 250 volts, will go into either of the standard cut-out bases.