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).
The correct tin-lead fuse wire size for a distribution board.
| Identifier | ExFiles\Box 61\2\ scan0331 | |
| Date | 26th March 1920 | |
| X.2515 Mr. Clark. --------- FA198/26/3/20. X.2515 - FUSE SIZES FOR R.R. DISTRIBUTION BOARD X.3555. ON 4 EX. The best size of tin lead fuse wire to use on this board is 20 S.W.G. This will be reasonably safe under normal conditions. It will not however give the protection desired under abnormal conditions. L.F. | ||