307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
43 | DF | PLURAL SUPPLY CIRCUITS OR SOURCES {14} |
52 | DF | .~ Load current control {4} |
53 | DF | .~.~ Load current division {3} |
55 | DF | .~.~.~ Fixed or predetermined ratio {3} |
57 | .~.~.~.~ Plural generators |