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Electrostatic apparatus shall be equipped with automatic means that will rapidly de-energize the high-voltage elements under any of the following conditions:
  1. Stoppage of ventilating fans or failure of ventilating equipment from any cause
  2. Stoppage of the conveyor carrying goods through the high-voltage field unless stoppage is required by the spray process
  3. Occurrence of excessive current leakage at any point in the high-voltage system
  4. De-energizing the primary voltage input to the power supply
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