The employer shall organise appropriate practical safety training for :
1° Workers hired by the employer ;
2° Workers who change workstation or technique;
3° Temporary employees, with the exception of those called in to carry out urgent work necessitated by safety measures and who already have the necessary qualifications for such work;
4° At the request of the occupational physician, workers returning to work after at least twenty-one days off.
This training is repeated periodically under conditions determined by regulation or by collective labour agreement.