Construction "Class III personnel" (not "Class III safety officer"). "Three types of personnel" refers to the main person in charge of the enterprise, the person in charge of the project and the full-time safety management personnel). According to the relevant regulations, the validity period of the "three types of personnel" assessment certificate is three years, and an extension should be applied to the original issuing authority 3-5 months before the expiration of the three-year period. The holder must participate in at least one safety production education and training organized by the unit and at least one safety production education organized by the original issuing authority within three years. Every year, the competent department will hold a number of "three types of personnel" delayed training and education, and all relevant units should independently organize their own certified personnel to participate in the training carried out by the competent department according to the actual production.

For the specific training time, please pay attention to the notices and announcements issued by the relevant authorities (visit the relevant websites for enquiries), or you can directly consult the relevant authorities.