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).
Experimental results on the current carrying capacity of various cables and fuse wires.
| Identifier | ExFiles\Box 166\7\ img016 | |
| Date | 27th May 1933 guessed | |
| -3- Cables. 40/36 cable becomes warm when carrying 34 amperes for one minute but insufficient to cause any damage. 23/36 cable becomes rather hot after carrying 34 amperes for one minute. It is in this circuit that a small fuse is required. Results of experiments on carrying capacity of fuse wire. It was observed that during the experiments that the fuse wire should not be slack in its length or should it be stretched tight between the terminals as this produces complicating results. The wire should also be held away from the bakelite body only being allowed to come into contact with the straps of the same. This may increase the capacity of the fuse if not adhered to. The following results were obtained on various gauges of wire, when the wire under test was connected across the fuse body in a clockwise direction and passing across the centre of the hole in the same 30 S.W.G. 39.6 amperes. 32 S.W.G. 29.7 " 34 S.W.G. 23.4 " 36 S.W.G. 5.6 " Fusing current (momentarily) after carrying a current having an oxidising effect for 5 mins. 30 S.W.G. 38.1 amperes. 32 S.W.G. 28.6 " 34 S.W.G. 23.0 " 36 S.W.G. 15.0 " | ||