From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Advantages of cartridge fuses and recommending altering the standard fuse wire gauge.
| Identifier | ExFiles\Box 166\7\ img013 | |
| Date | 26th May 1933 | |
| -2- Ha/Wat.1/MA.26.5.33. Cont'd.{John DeLooze - Company Secretary} (a) The fuse wire does not oxidize so readily and therefore lasts longer when used in a heavy current circuit. (b) The fusing current is more constant, and more nearly the rated fusing current of the wire. A 30 S.W.G. fuse in a cartridge holder fused at 20 amperes as against 39 in the standard holder, the rated fusing current being 15 amperes. (c) The fuses are more easily replaceable spares being carried instead of reloading the fuse, which might be done sometime by an irresponsible individual using too heavy a gauge of wire. With regard to the existing standard fuses in view of the high fusing current of the same we recommend that we immediately alter the fuse wire gauge to 32 S.W.G. Tinned copper. This will reduce the average fusing current from 39 amperes to 29 amperes. We propose to issue a depot sheet covering this recommendation. With respect to the other recommendation i.e. cartridge type fuses we should be glad to have the opinion of all concerned. Ha/Wat. 30 - SWG .012 32 - SWG .0108 | ||