(2) The regulations required shall be such as are reasonably necessary for the protection of the health, welfare and safety of the public and of persons using or handling such materials, and shall be in substantial conformity with the generally accepted standards of safety relating to the same matter. Regulations in substantial conformity with the published standards of the National Fire Protection Association pamphlet No. 58 and pamphlet No. 59 for the design, installation and construction of containers and equipment thereto pertaining, for the storage and handling of liquefied petroleum gases, including utility gas plants, as recommended by the National Fire Protection Association, and the published standards of the National Fire Protection Association pamphlet No. 54 for liquefied petroleum gas piping and appliance installations in buildings, shall be deemed to be in substantial conformity with the generally accepted standards of safety relating to the same subject matter. [Amended by 1957 c.712 §2; 1961 c.477 §1; 1967 c.417 §26; 2009 c.790 §4]