![]() ![]() The schedule allows additional breaks for workers as the wind velocity at the work site increases and/or the temperature drops. Work/rest schedule: The “ work warm-up schedule,” as developed by the Saskatchewan Occupational Health and Safety Division shows the warm-up breaks required for working in cold conditions and the normal breaks to be provided every two hours. One kilocalorie is the amount of heat needed to raise the temperature of one kilogram of water by 1☌. Metabolic heat production is measured in kilocalories (kcal) per hour. However, tables are available in literature showing metabolic rates for a variety of activities. Physical Activity: The production of body heat by physical activity (metabolic rate) is difficult to measure. The absorbed moisture “wicks” away (evaporates) which can accelerate heat loss through conduction. ![]() As humidity increases, more moisture from the air can be absorbed by clothing, which reduces its ability to insulate. Humidity (wetness): Air humidity is measured by a hygrometer in percent relative humidity (%RH). 32 km/h (20 mph): causes blowing and drifting snow.24 km/h (15 mph): raises newspaper sheet,.16 km/h (10 mph): light flag fully extended,.The following is a suggested guide for estimating wind speed if accurate information is not available: Air movement is usually measured in m/s while wind speed is usually measured in km/h or mph. These are calibrated in metres per second (m/s), kilometres per hour (km/h) or miles per hour (mph). Wind Speed: Different types of commercially-available anemometers are used to measure wind speed or air movement. In order to work safely, these challenges have to be counterbalanced by proper insulation (layered protective clothing), by physical activity and by controlled exposure to cold (work/rest schedule).Īir Temperature: Air temperature is measured by an ordinary thermometer in degrees Celsius (☌) or degrees Fahrenheit (☏). A cold environment challenges the worker in three ways: by air temperature, air movement (wind speed), and humidity (wetness). ![]()
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