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WORK WARMUP SCHEDULE FOR 4 HOURS WORK SHIFT Air Temperature-Sunny Sky No Noticeable Wind 5 mph Wind 10 mph Wind 15 mph Wind 20 mph Wind Max. Max. Max. Max. Max. Work No.of Work No.of Work No.of Work No.of Work No.of 0 1.-261 to-281 -150 to-190 (Norm. 1 (Norm. 1 75 min 2 55 min 3 40 min 4 Breaks) Breaks) 2.-29°to-31' -200 to-241 (Norm. 1 75 min 2 55 min 3 40 min 4 30 min 5 Breaks) 3.-320to-340 -250to-290 75 min 2 55 min 3 40 min 4 30 min 5 Non-emergency work should cease 4.-350 to-370 -300to-34° 55 min 3 40 min 4 30 min 5 Non-emergency work Non-emergency work should cease should cease 5.-380 to-390 -35°to-39° 40 min 4 30 min 5 Non-emergency work Non-emergency work Non-emergency work should cease should cease should cease 6.-400 to-420 -40°to-440 30 min 5 Non-emergency work Non-emergency work Non-emergency work Non-emergency work should cease should cease should cease should cease 7.430&below -450&below Non-emergency work Non-emergency work Non-emergency work Non-emergency work Non-emergency work should cease should cease should cease should cease should cease Schedule applies to moderate to heavy work activity with warm-up breaks of ten(10)minutes in a warm location. For light-to-moderate work(limited physical movement),apply the schedule one step lower. For example,at-30—F with no noticeable wind(Step 4),a worker at a job with little physical movement should have a maximum work period of 40 minutes with 4 breaks in a 4-hour period(Step 5). The following is suggested as a guide for estimating wind velocity. If accurate information is not available: 5 mph:light flag moves; 10 mph:light flag fully extended; 15 mph:raises newspaper sheet;20 mph:blowing and drifting snow. If only the Windchill Factor is available,a rough rule of thumb for applying it,rather than the temperature and wind velocity factors given above, would be: 1)special warm-up breaks should be initiated at a wind chill of about 1,750 W/m2/hr;2)all non-emergency work should have ceased at or before a wind chill of 2,250 W/mZ/hr. In general,the warm-up schedule provided above slightly under-compensates for the wind at the warmer temperatures, assuming acclimatization and clothing appropriate for winter work. On the other hand,the chart slightly over-compensates for the absolute temperatures in the colder ranges,since windy conditions rarely prevail at extremely low temperatures. *From Occupational Health&Safety Division,Saskatchewan Dept.of Labor