Unless placement at a greater height is required pursuant to § 56-466 or other applicable law, any electric distribution line that is installed, either as a new line or as a replacement for an existing line, on or after July 1, 2018, by or for an electric utility upon or over land upon which agricultural operations, as defined in § 3.2-300, are conducted shall be placed at a height that is not less than the minimum height requirement that applies to the placement of electric distribution lines above road crossings.