(1)    Except as provided under sub. (2), all officers and employees of the board of school directors of any 1st class city are members of the classified service and shall be selected and have their tenure and employment status determined in accordance with ss. 63.18 to 63.51, the rules adopted under ss. 63.18 to 63.51 and the charter ordinances applying to the board of city service commissioners of the city.

   (2)   The following employees are not members of the classified service: the superintendent of schools, deputy superintendent of schools, associate superintendent of schools, executive assistant to the superintendent of schools, assistant to the superintendent of schools, assistant superintendent, division director, department director, principals, teachers and substitute teachers actually engaged in teaching, staff of the board of school directors if the board so decides under s. 119.18 (10) (c), and, in any department of the school board devoted wholly or principally to the subjects of municipal recreation and adult education, all employees of those departments whose duties are peculiar to municipal recreation and adult education but not including employees whose duties are clerical or custodial.