(A) It shall be unlawful for any journeyman plumber to do plumbing work within the corporate limits of the city, unless the work is done by employment of the journeyman plumber by a plumbing contractor or master plumber.
(B) All plumbing work done within the corporate limits of the city, from and after the effective date of this article, shall be done under contract or agreement with a plumbing contractor.
(C) Should any journeyman plumber perform plumbing work within the corporate limits of the city, except under employment by a plumbing contractor, such shall be deemed an offense and a violation of this article.
(`90 Code, § 4-20)