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Section V - Cases Per Exposure Decade <br /> Public Power, as a subgroup of the electric industry, has difficulty finding a statistic that <br /> accurately depicts safety culture. Although the Incidence Rate and DART Rate help utilities <br /> benchmark across the entire industry, normalizing utilities' worker hours to 100 employees <br /> skews smaller utilities' data. Skewed data becomes all too common in a segment of the sector <br /> where the median utility size is less than 2,000 customer meters. <br /> To represent a utility's safety culture without averaging, normalizing, or skewing data, we <br /> decided to include a new section on cases per exposure decade. Cases Per Exposure Decade <br /> has three components: total number of cases, 20,800 worker hours of exposure (number of <br /> worker hours in ten years), and a utility's worker hours of exposure. These three input numbers <br /> are represented in the equation below. <br /> (Cases * 20,800 Worker Hours) <br /> Cases Per Exposure Decade = <br /> Number of Work Hours <br /> Cases Per Exposure Decade - Group <br /> Figure 31 - Average Total Cases Per Exposure Decade by Group <br /> 0.90 <br /> 0.82 <br /> 0.80 <br /> 0 <br /> U <br /> N <br /> 0.70 <br /> Q) <br /> a 0.60 <br /> 0.58 <br /> W <br /> a) 0.50 0.49 <br /> 0.45 <br /> 0.42 <br /> 2• 0.40 <br /> U <br /> 10.31 <br /> • 0.30 0.24 0.26 <br /> m• 0.20 <br /> 0.10 <br /> 0.00 <br /> A B C D E F G H <br /> 2018 American Public Power Association's Safety Awards of Excellence Report Page 22 <br /> 419 <br />