| 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} |
| 514 | ![]() | .~.~.~ By exposing component to liquid or gas while under test |