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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).
Examination and testing of a new distribution board, with recommendations for improvement.

Identifier  WestWitteringFiles\D\February1920\  Scan12
Date  7th February 1920
  
To R.{Sir Henry Royce} from Ck.{Mr Clark}
c. to CJ.
c. to E.{Mr Elliott - Chief Engineer}
c. to Bn.{W.O. Bentley / Mr Barrington}
c. to Da.{Bernard Day - Chassis Design}
c. to Hs.{Lord Ernest Hives - Chair}

ORIGINAL

Ck{Mr Clark}1/T7.2.20.

X.3555 - R.R. DISTRIBUTION BOARD

We have examined and tested the first R.R. distribution board made by the Experimental Dept., and now offer the following remarks in connection with this :-

(1). There are no faults of the nature of earths or misconnections on this board. Each bar has been tested to earth and to its neighbour with 200 volts A.C. without breakdown.

(2). There doesnot appear to be sufficient safeguard against accidental short circuits if, for any reason, a connection has to be made or broken on the board. We suggest that the insulating plate should be made to cover a greater portion of the aluminium surface. As there is, and can be, no fuse in the main battery circuit (this being the case because it is not desirable to give the battery an opportunity of being cut off, owing to certain characteristics of the charging dynamo) hence it is advisable to particularly avoid the possibility of short circuits.

(3). The insulating material of the fuse holders is not entirely satisfactory, as it may become charred by the heat of the fuse wire and liable to break, in fact one holder has actually broken on experimental test. (This has also happened on a Lucas fuse holder on our bench test).

Contd.
  
  


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