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 |