Any alterations or additions to be made in the existing wiring of any building or the wiring of any building or the wiring of any building for the placing of any electric lights, motors, heating devices or any apparatus requiring the use of electrical current shall be done by an electrical contractor qualified by the town, in accordance with the provisions of this chapter, to do such work.  The owner of a building may do such wiring in his own building; provided however, that the wiring shall be inspected by the Electrical Inspector in accordance with the provisions of this chapter.