Where do we find the minimum quantities of particular chemicals required to produce vapors "...in the air in quantities sufficient to produce explosive or ignitable mixtures"? [NFPA 70 2014, Article 500.5(B)] We have a code official asking us to classify four hand-held containers of flammable cleaning & preservation chemicals (sizes 5 ounces to 32 ounces), per NEC 500.5 -- but we can't find any definition of "quantities sufficient", such as what is listed in IBC Chapter Four Three. Any insight would be greatly appreciated.
Thanks.