A manufactuting plant I am working with is planning a 13,000 square foot expansion. This new area will be a Class I, Division 1 area for mixing and storing liquids for flavoring and will call for explosion proof equipment. Question - Is facility lightning protection (lightning rods with grounding) called for on the expansion because of the Class and Division ratings? If so, will the original plant need it too - there is none now. Thanks in advance for any input.