361 / | HD | ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES |
1 | DF | SAFETY AND PROTECTION OF SYSTEMS AND DEVICES {32} |
88 | .~ With specific voltage responsive fault sensor {4} | |
89 | DF | .~.~> With time delay protective means |
90 | DF | .~.~> Overvoltage and undervoltage |
91.1 | DF | .~.~> Overvoltage {6} |
92 | DD | .~.~> Undervoltage |