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).
Fuse wire testing, with observations on 30 SWG wire and a recommendation to replace the existing 28 SWG wire.
| Identifier | ExFiles\Box 166\7\ img109 | |
| Date | 8th March 1940 | |
| -2- The fuses were then reloaded with 30 SWG. tinned copper wire and again a gradually increasing current passed through the circuit. Observations were as follows:- 30 SWG. WIRE. Condition of Circuit. Condition of Fuse. 15 amperes No apparent affect. 20 " Warm. 25 " Hot. 32 " Commencing to glow. 33 " Red hot. 34 " Bright red hot. 36 " Fuse melted. These results were considered more satisfactory and as the maximum loading of the circuits appeared to be reasonably within the oxidising current of 30 gauge wire, it was decided to use it in place of the 28 gauge wire. The fuse wire (including that carried on the spare bobbin) has been changed over on all experimental cars excepting 1.B.V. which is partly dismantled at Shardlow, and some of these, including 11.B.V., have been running about with the lighter gauge fuse wire for the last 3 months without any trouble occurring. We recommend that all cars from the B.V. class have the fuses loaded with 30 SWG. wire in place of the existing 28 SWG. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||