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The maximum allowable bearing temperature during insulation is set at 250 degrees. This temperature is critical because it helps ensure the health of the bearing and related components. If the temperature exceeds this limit, it can lead to the degradation of the lubricant, which is essential for minimizing friction and wear. Excessive heat can also cause thermal expansion, potentially resulting in misalignment and premature failure of the bearing.

Maintaining the temperature at or below this threshold is vital for both the longevity and reliability of machinery in operation. It is standard practice in the industry to monitor bearing temperatures closely, especially in processes that involve insulation, to prevent damage and ensure optimal performance. The other temperature options are set lower than the threshold, which means that while they can be monitored, they do not represent the maximum allowable limit for proper insulation during operation.