CHST Practice Test – Complete Exam Preparation

The formula to calculate the Total OSHA Recordable Incidence Rate (TRIR) is designed to express the number of recordable incidents in a specific time frame relative to the total hours worked within that timeframe, normalized to a standard base of 200,000 hours. This standardization is crucial as it allows for a meaningful comparison of incidence rates across different organizations, regardless of their size or the number of hours worked.

Using the formula (Total recordable accidents x 200,000) / Total man hours worked calculates the number of recordable incidents per 200,000 hours worked. The factor of 200,000 represents the number of hours that 100 employees would work over a year, assuming a standard 40-hour work week. This normalization helps to highlight safety performance and trends in workplace injuries and illnesses.

In contrast, the other options do not accurately reflect the calculation of TRIR. By adding 200,000 to total accidents or manipulating the formula in other ways, they do not allow for a correct calculation as per OSHA standards. The chosen formula captures both the incidence of accidents and the context of labor hours, making it the appropriate method for determining TRIR.