All commercial and public structures which are erected or undergo major renovations after the effective date of this section, in the City of Moundsville or within the jurisdiction and authority of the City of Moundsville Fire Department that are required to have an automatic sprinkler system pursuant to West Virginia State Fire Codes and Regulations or the National Fire Prevention Code, shall have a post indicator valve, a wall mount indicator valve, or a valve pit with supervisory alarm, the type thereof to be approved by the City of Moundsville Fire Department. This section shall not have retroactive application to existing structures unless major renovations are made to the structure. Major renovation for the purposes of this section shall be defined as improving the structure where the cost of said improvement (or the aggregate of all improvements in a one year period after commencement of improvement) is greater than 20% of its assessed value for real estate tax purposes in the year the improvement or improvements are commenced. This section shall apply to all commercial and public structures constructed after the effective date of this section. (Ord. 2-19-02.)