Which equipment should be turned off if methane concentration exceeds one percent?

Prepare for the Underground Mine Foreman Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

If methane concentration exceeds one percent, it is crucial to turn off the auxiliary fan. The auxiliary fan is typically used to ventilate specific workings or areas within the mine, and if it is running in an environment with high methane levels, it could potentially exacerbate the situation by circulating the methane and possibly bringing it into contact with ignition sources. This creates a significant risk of fire or explosion.

In contrast, the main ventilation fan generally operates to provide fresh air to the underground mine, and while it is also important in managing air quality, shutting it down could lead to insufficient ventilation, allowing methane levels to rise further. Lighting systems are generally designed to be safe in hazardous conditions and are equipped to handle certain levels of methane without causing ignition. Emergency alarms are critical safety devices that need to remain operational to alert personnel of the dangerous conditions. Therefore, turning off the auxiliary fan is the most appropriate action to take in response to increased methane concentrations.

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