Electrostatic apparatus shall be equipped with automatic controls operating without time delay to disconnect the power supply to the high-voltage transformer and signal the operator under any of the following conditions:
- Stoppage of ventilating fans or failure of ventilating equipment from any cause.
- Stoppage of the conveyor carrying articles past the high-voltage grid.
- Occurrence of a ground or an imminent ground at any point of the high-voltage system.
- Reduction of clearance below that required in Section 2407.2.