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).
Suitability and specifications of a fuse wire for a switchboard.
| Identifier | ExFiles\Box 61\2\ scan0384 | |
| Date | 1st September 1920 | |
| R.R. 199 (250T) (SD676 19-7-17) MP 18.865 X.2515 To O.O. from By/WER. By/WER2/EF1.9.20. c. to Sft.{Mr Swift} c. to EFC. c. to BP. E FOR X.3749. D.1165 - FUSE FOR WIRE SWITCHBOARD X.2515. SECTION 7310. Mr. Clark states that the Fuse Wire, .0132 diameter alloy tin which is a sample of a quantity ordered for Mr. Brock for testing condensers is not suitable for use with the Lucas switchboard. Will you, therefore, order to our original specification, with the exception that we are now prepared to increase the limit for the fuse current. The specification is as follows:- 30 SWG: lead Tin Alloy a Length .650" ina 12 volt circuit should fuse with a current of not less than 4½ amperes. and not more than 5½ amperes. We are unable to say definitely without testing which wire in the London Electric Wire Co's., Fuse Wire Table will be most suitable, for our requirements. By/WER. | ||