| 324 / | HD | ELECTRICITY: MEASURING AND TESTING | 
| 500 | DF | FAULT DETECTING IN ELECTRIC CIRCUITS AND OF ELECTRIC COMPONENTS {10} | 
| 512 | DF | .~ For fault location {10} | 
| 513 | DF | .~.~ Where component moves while under test {2} | 
| 515 | DF | .~.~.~ Using a particular sensing electrode {3} | 
| 517 |  | .~.~.~.~ Wire bristles |