(1)    An automatic fire sprinkler fitter-maintenance only registration certificate is required for any person who is employed to maintain automatic fire sprinkler systems by a business establishment registered under s. 145.175. The department shall, by rule, specify the requirements for issuing an automatic fire sprinkler fitter-maintenance only registration certificate and specify the activities in which a person holding a certificate under this section may engage.

   (2)   This section does not apply to any person registered under s. 145.16 or licensed under s. 145.17 (2).