| 174 / | HD | ELECTRICITY: CONDUCTORS AND INSULATORS | 
| 68.1 | DF | CONDUITS, CABLES OR CONDUCTORS {15} | 
| 126.1 | DF | .~ Conductor structure (nonsuperconductive) {6} | 
| 128.1 | DF | .~.~ Plural strand {3} | 
| 129 R | ![]()  | .~.~.~ Assemblies of noncircular section {2} | 
| 129 B | DF | .~.~.~.~> Bus bars | 
| 129 S | DF | .~.~.~.~> Segmental, reentrant |