It shall be unlawful for any person, be he master plumber, employing plumber or journeyman plumber, to engage in the business of installing sanitary plumbing or to install sanitary plumbing for compensation or hire until such person shall have made application for and shall have received a certificate which authorizes him to engage in such business or to install such sanitary plumbing, in accordance with the provisions of this article. Any person violating any provision of this article shall be guilty of a misdemeanor and, upon conviction, shall be punished by a fine of not exceeding one hundred dollars or imprisonment not exceeding thirty days for each offense.