The Zoning Board of Review may, in appropriate cases and subject to appropriate conditions and safeguards, make special exceptions to the Rules and Regulations of said Planning Board in harmony with the general purpose and intent of such Rules and Regulations, or where exception is reasonably necessary for the convenience or welfare of the public; and shall have the following powers:
A. To hear and decide appeals where it is alleged there is error to any order, requirement, decision or determination made by the Planning Board in the enforcement of the Rules and Regulations.
B. To hear and decide special exceptions to the terms of the Rules and Regulations upon which such Board is authorized to pass.
C. To authorize upon appeal, in specific cases, such variance in the application of the terms of the Rules and Regulations as will not be contrary to public interest where, owing to special conditions, a literal enforcement of the provisions of such Rules and Regulations will result in unnecessary hardship and so that the spirit of the Rules and Regulations shall be observed and substantial justice done.
D. In exercising the powers mentioned above, the Zoning Board of Review may, in conformity with the provisions of the General Laws of the State of Rhode Island, 1956 (45-23), reverse or affirm, wholly or partly, or may modify the decision appealed from, and make such order requirement, decision or determination as ought to be made and, to that end, shall have all the powers of the Planning Board from whom the appeal was taken.
E. The concurring vote of three (3) members of the Zoning Board of Review shall be necessary to reverse any decision or determination of the Planning Board.