| 307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
| 43 | DF | PLURAL SUPPLY CIRCUITS OR SOURCES {14} |
| 44 | DF | .~ One source floats across or compensates for other source {3} |
| 48 | DF | .~.~ Storage battery or accumulator-type source {2} |
| 49 | ![]() | .~.~.~ With series-connected auxiliary source |