What are the occupational classes? Professionals, such as doctors, lawyers, dentists and senior executives. Administrative office workers who face few, if any, workplace hazards, such as clerical staff Supervisors in low-risk environments, salespersons and like occupations. Skilled manual workers who face few or no workplace hazards, or those working, for instance, as courier truck drivers. Manual labourers who work in hazardous environments, such as home construction workers