| 307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
| 11 | DF | PLURAL LOAD CIRCUIT SYSTEMS {8} |
| 38 | ![]() | .~ Selectively connected or controlled load circuits {3} |
| 39 | DF | .~.~> Condition responsive |
| 40 | DF | .~.~> Code-controlled |
| 41 | DF | .~.~> Sequential or alternating |