Which of the following is NOT a circumstance under which a person may be exposed to an effective temperature exceeding 29.4 C?

• A. Carrying out a work in an escape or emergency
• B. Mines rescue member carrying out training or emergency response
• C. Deputy conducting an inspection under the controls agreed with the UMM within the bounds of the risk assessment
• D. Working to reduce effective temperature

Answer: (D)

Exposure to an effective temperature above 29.4 C is allowed only in specific duty contexts where there are protective controls or urgent needs. The situations that fit this are when work must continue in an escape or emergency, during mines rescue training or emergency response, or when a deputy conducts an inspection under risk controls agreed with the Underground Mine Manager within the risk assessment. These scenarios acknowledge that heat stress may be unavoidable but are managed by procedures and approvals.

The option about working to reduce the effective temperature is not a circumstance that justifies exposure to high heat. It describes an action aimed at lowering the temperature, not a scenario in which being in a hot environment is permitted. So this is not a circumstance that would allow exposure above the threshold.