Was reviewing NFPA 407 for aircraft fuel farms (2017 edition). Smaller skid mounted units. NFPA 407 5.1.6.1 indicates NEC 515 must be follows and considered class 1 liquids. Looking at 515 (2011 edition), it appears it is more intended for a facility that processes or stores bulk fuel; like a refinery. It does not appear to be related to a fuel farm at an airport. However, it does not appear you can be in compliance with the NFPA if you don't follow NEC 515. Is this being read correctly, what would the fuel farm fall under?