When are main fans permitted to be shut down?

Main fans are critical for ensuring proper ventilation in mining operations, as they help to circulate fresh air throughout the mine and remove hazardous gases. The practice of shutting down main fans is very strictly regulated to maintain miners' safety.

Scheduled maintenance is the only appropriate scenario in which these fans are permitted to be shut down, as this maintenance is planned to ensure that all systems are functioning optimally and safely. When fans are shut down for maintenance, it is typically done under controlled conditions, ensuring that all relevant safety measures are in place, including monitoring the air quality and ensuring that miners are not present in areas that would be impacted by reduced ventilation.

The other scenarios presented would generally put workers at risk. Shutting the fans down during breaks or shift changes can lead to hazardous conditions, as stagnant air may allow harmful gases to accumulate. Therefore, maintaining the operation of main fans, except for necessary and planned maintenance, is crucial for the safety of all personnel in the mine.