The purpose of this chapter is to adopt a complete Electrical Code, including provisions for the inspection and regulation of electrical installations, issuance of permits, collection of fees; and to provide penalties for violations of this chapter. The provisions of this chapter do not apply to any of the following: regular employees of a public utility who do electrical work for such public utility only; the electrical work of a telephone or telegraph company, or the persons performing electrical work for such a company, where such electrical work is an integral part of the plant used by such telephone or telegraph company in rendering its duly authorized service to the public; and regular employees of any railroad who do electrical work only as a part of that employment. The provisions of this chapter apply to and govern the supply of electricity and all sales, rentals, leases, uses, installations, alterations, repairs, removals, renewals, replacements, disturbances, connections, disconnection and maintenance of all electrical equipment.