Employers have specific requirements when temperature thresholds are met, such as providing water and allowing rest breaks. However, they are not mandated to provide protective clothing. This means that among the options given, protective clothing is the one that does not have a strict requirement under these conditions. ;
The requirement that is NOT mandated for employers when temperature thresholds are triggered is protective clothing. Employers must provide water and allow rest breaks, but protective clothing is not a strict requirement. Therefore, the correct answer is "C. Protective clothing."
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