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).
Comparative electrical tests on Maconite, Gloverite, and Helsby cables.
| Identifier | ExFiles\Box 58\1\ Scan195 | |
| Date | 6th December 1929 | |
| -6- cables were tested and in the case of the former make, one sample broke down after 1/2 min. at 19,300 volts R.M.S. and the other after 2 mins. at the same voltage, whilst both the Maconite samples successfully withstood 19,300 volts R.M.S. for 15 mins. An additional test was made on samples of standard Maconite cable which had done a 10,000 mile test on chassis 22-EX in France. These samples successfully withstood 19,300 volts R.M.S. for 5 mins. after 72 hrs. immersion in water. The conclusion resulting from these tests are summed up in continuation of report WD.{Mr Wood/Mr Whitehead}92 as follows :- "These tests shew that although Gloverite gives a good electrical performance when new, it rapidly deteriorates under service conditions and would require replacing after about 10,000 miles. The present standard Maconite cable not only gives a good performance new, but maintains its initial quality over a long period of running and these tests shew the Maconite to be definitely superior in the majority of the items in the test specification. The Helsby cable is not as good dielectrically as the other three makes of cable or as regards heat and atmospheric resistivity in the case of Maconite and Super Glover. The Super Glover we consider to be a good grade of cabl | ||