| 307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
| 43 | DF | PLURAL SUPPLY CIRCUITS OR SOURCES {14} |
| 72 | ![]() | .~ Diverse or unlike electrical characteristics {3} |
| 73 | DF | .~.~> Differing frequencies |
| 74 | DF | .~.~> Differing capacities |
| 75 | DF | .~.~> Differing voltages {1} |