| 361 / | HD | ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES |
| 1 | DF | SAFETY AND PROTECTION OF SYSTEMS AND DEVICES {32} |
| 117 | DF | .~ High voltage dissipation (e.g., lightning arrester) {10} |
| 131 | ![]() | .~.~ Combined (e.g., with disconnect switch) {1} |
| 132 | DF | .~.~.~> With line supporting insulator |