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Basing on physical model of heat exchange between human body and environment, predicted thermal load under the work site parameters, specific for deep mines, was defined in the paper. The relationships included in EN ISO 7933 standard were used for this purpose. Level of heat accumulation, degree of skin moistness, maximum volume of sweat and body dehydration were evaluated. These parameters we used to define the safe time of work under difficult climate conditions. The calculations were made in respect of acclima...