| 307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
| 11 | ![]() | PLURAL LOAD CIRCUIT SYSTEMS {8} |
| 12 | DF | .~> Common conductor or return type {3} |
| 17 | DF | .~> Transformer connections |
| 18 | DF | .~> Plural sources of supply {5} |
| 30 | DF | .~> Anticoupling of load circuits through same source |
| 31 | DF | .~> Control of current or power {3} |
| 36 | DF | .~> Serially connected load circuits {1} |
| 38 | DF | .~> Selectively connected or controlled load circuits {3} |
| 42 | DF | .~> Circuit arrangements or layouts |