In the 2027 edition of NFPA 30, the standard now provides a NEW schematic illustrating the spatial layout of hazardous (classified) locations for indoor areas with process equipment containing ignitible (flammable or combustible) liquids at pressures of 100 psig or less. I am not sure why they included this in NFPA 30 (Chapter 7) or why the new schematic differs from that in NFPA 497, but I will discuss this new schematic and other changes to NFPA 30 as they relate to HAZLOCs. It may be easier for some to understand the new view, but I wonder if NFPA 497 will be revised to reflect this new schematic.