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 | .~.~ Storage battery or accumulator-type source {2} | |
49 | DF | .~.~.~> With series-connected auxiliary source |
50 | DF | .~.~.~> Tap-changing or variable number of cells |