This chapter is enacted for the purpose of safeguarding homeowners, other property owners, tenants, and the general public against faulty, inadequate, inefficient, or unsafe electrical, plumbing, low voltage wiring, utility contracting, or conditioned air installations. The practices of electrical contracting, plumbing contracting, low voltage contracting, utility contracting, and conditioned air contracting are declared to be businesses or professions affecting the public interest; and this chapter shall be liberally construed so as to accomplish the purposes stated in this Code section.