It shall be unlawful for any person to engage in the business of contracting mechanical work, HVAC installation and gas piping of any nature without first being registered as a mechanical contractor qualified under the provisions of this division; further, mechanical contracting shall be bonded and duly authorized as provided for in this division.
Journeyman mechanical fitters shall work under the supervision of a master mechanical fitter and are prohibited from engaging in the business of mechanical contractor within the scope of this article.