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).
Insulation breakdown and resistance test procedures.
| Identifier | ExFiles\Box 61b\3\ scan0176 | |
| Date | 8th December 1926 guessed | |
| -6- Contd. ammeter needle, it may be depended upon to be quite satisfactory when working in conjunction with its companion brush, provided this latter is equally good. Therefore, during the load test each brush in rotation should be lifted off the commutator and the effect observed on the ammeter and opposite brush. TEST 4. INSULATION BREAKDOWN TEST. While still warm from the above tests an alternating voltage of 200 from the lighting mains shall be applied through a light fuse for 10 minutes without breakdown, between the armature and field windings and the motor casing. TEST 5. INSULATION RESISTANCE TEST. Insulation resistance now taken must not be less than one megohm. EFC. | ||