Which situation does not require controlled ventilation to be applied to a location?

• A. A place where controlled ventilation has failed and is being inspected to re-establish controlled ventilation.
• B. A heading or roadway where other control measures have been implemented to minimise gas accumulation.
• C. A normally ventilated working place with no gas hazards.
• D. An area sealed off by a Type B seal.

Answer: (A)

Controlled ventilation is used to keep the mine atmosphere safe, diluting and removing dangerous gases where needed. In the situation described, the system for controlled ventilation has already failed and is being inspected to re-establish it. At that moment, there isn’t active controlled ventilation reaching that location—the priority is to diagnose and repair the failure to restore CV. Therefore, no controlled ventilation is being applied to that spot during the inspection phase, making it the condition where applying CV is not yet part of the current action.

Other scenarios involve conditions where ventilation is either still needed or not possible to maintain safely: a roadway that relies on other measures yet may still require CV to manage gas, a normally ventilated area with no gas hazards generally doesn’t require special CV beyond normal operation, and a sealed-off Type B area is isolated and wouldn’t receive CV.