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).
Vehicle electrical systems, earthing, and the use of fuses in battery and distribution circuits.
| Identifier | ExFiles\Box 61\2\ scan0345 | |
| Date | 6th August 1920 | |
| R.R. 285A (100 T) (S.G. 648, 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2618 Contd. -2- EFC3/T6.8.20. earthed as before. We do not know whether this was your impress- ion, but we had not made the heavy motor circuit dependent upon the frame in any way. All we have done is to earthe the light current connection direct from the negative pole of the battery in accordance with LeC.1125. There seems to us to be an objection to having a fuse in the battery circuit at all, as, supposing this has gone and the dynmo be run with some of the lights switched on, there is danger, of these lamps being burnt out by the over- voltage when using a dynamo with inherent control. A field fuse prevents the dynamo from damage in such a case, but the probability is that the filament of the lamps would be fused before the field fuse had time to go. There appear in this another argument in favour of the vibrator regulator control system, in which case a battery fuse no doubt should be used with its attendant advantages. There seems to be a general feeling here against the use of the single distributing fuse, whivh, if it goes, puts out all the lights and puts out of operation the Klaxon, Ignition, and Starter Motor actuation, and possibly more important than all, the supply to the inspection lamp plug socket. it appears to us that either no fuse, or more than one fuse, should be used on the distribution circuit. EFC. | ||