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).
Dangerous alteration of the EAC.10 distribution board's main battery fuse from a screw-in to a clip-in type.
| Identifier | WestWitteringFiles\T\November1928\ Scan063 | |
| Date | 1st November 1928 | |
| To R.{Sir Henry Royce} From EFC. c. E.{Mr Elliott - Chief Engineer} RJ. HY.{Tom Haldenby - Plant Engineer} B/LAD ORIGINAL EP{G. Eric Platford - Chief Quality Engineer}03/130.11.28. X7740 X2515 EAC.10 DISTRIBUTION BOARD On the new EAC.10 distribution board the main battery or emergency fuse has been altered from the type with the solid and sound securing screws to the clip-in type of fuse, larger, but otherwise like the main distribution fuses, and only two strands of No.30 S.W.G. are indicated. We deprecate this change and consider it dangerous. Great stress has been laid from time to time on the necessity of solid and sound connections between dynamo and battery on the battery side of the charging switch in particular. Owing to the intrinsic characteristics of the dynamo, a faulty connection in this circuit is liable to have a positively cumulative action. There is a possibility of fault development such as to endanger the system. We therefore arranged originally for three strands of 30 S.W.G. fuse wire making up a fuse which takes 90 amperes approx. before going. The idea in this instance is not perhaps a fuse in the ordinary sense, but an emergency protection against fire which might otherwise be caused on some of the circuits by the occurrence of a dead earth. The 'fuse' is of such a nature as to be a solid and sound unit and it is not likely to part or be interfered with in normal circumstances. Now we have replaced this by a fuse holder of the clip-in type and introduced two additional pressure contacts. It is true that this fuse holder cannot be completely exchanged with one of the main distribution fuse holders, nevertheless | ||