| 174 / | HD | ELECTRICITY: CONDUCTORS AND INSULATORS |
| 8 | DF | WITH FLUIDS OR VACUUM {12} |
| 15.1 | ![]() | .~ With cooling or fluid feeding, circulating or distributing {6} |
| 15.2 | DF | .~.~> By heat pipe |
| 15.3 | DF | .~.~> For bushing or pothead |
| 15.4 | DF | .~.~> Superconductive type {1} |
| 15.6 | DF | .~.~> For cable, conductor or joint |
| 15.7 | DF | .~.~> For welding or furnace cable |
| 16.1 | DF | .~.~> By ventilation or gas circulation {2} |