| 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} |
| 56 | ![]() | .~.~.~.~ Diverse-or unlike-type sources |