The electrical inspector shall inspect all new electrical installations, additions, alterations or repairs to existing installations at any time deemed necessary. He shall approve or reject all electrical plans and specifications. He shall keep a file of all permits issued and shall issue a certificate of inspection of all approved work. He shall maintain a file of all listed inspected appliances issued by the Underwriters' Laboratories, Inc., which shall be accessible for public reference. He shall not engage in the business of sale, manufacture, installation or maintenance of electric wiring, equipment or devices while engaged as electrical inspector. (Prior code § 16-2-2)