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).
Technical specification and breakdown voltage test results for various types of electrical cables.
| Identifier | ExFiles\Box 167\3\ img137 | |
| Date | 19th January 1939 | |
| (1) Attached to Rm{William Robotham - Chief Engineer}/RC.{R. Childs}8/JH.19.1.39. Type of cable. Breakdown Complete cable. Voltage rubber only. (1) R.176/1 - 14/36: Black laquer finish over cotton braid and yellow tape. Overall diameter .160 inches. Diameter of rubber .095 inches. 13,050 13,880 (2) R.276/1 - 23/36: Finish as (1) Overall diameter .153 inches Diameter of rubber .090 inches. 8,400 5,500 (3) RL.276/1F - 23/36 : Clear varnish finish over cotton braid. Overall diameter : .127 inches. Diam. of rubber .090 inches. 10,300 6,000 (4) S.276/1 - 23/36 aluminium laquer over cotton braid. Overall diameter .145 inches. Diameter of rubber .090 inches. 9,500 3,000 (5) R2A76/1 - 40/36 Finish as (1). Overall diameter .164 inches Diameter of rubber .105 inches. 8,700 3,000 (6) S2A76/1 - 40/36 Finish as (4) Overall diameter : .153 inches Diameter of rubber .107 inches. 4,700 3,500 (7) S3A76/1 - 110/36 Finish as (4) Overall diameter .205 inches. Diameter of rubber .138 inches. 6,600 3,000 Breakdown between the two cores. (8) RL.176/2F - 2x14/36 twin cable. Finish as (3) Overall dimensions .155 x .205 inches. 17,200 volts. (9) S172/2 - 2 x 14/36 Finish as (3). Overall dimensions .168 x .220 inches. No breakdown at 19,200 volts. | ||