NFPA 497
Recommended Practice for the
Classification of Flammable Liquids, Gases,
or Vapors and of Hazardous (Classified)
Locations for Electrical Installations
in Chemical Process Areas
Chapter 1 Administration
1.1 Scope.
1.1.1 This recommended practice applies to those locations
where flammable gases or vapors, flammable liquids, or combustible
liquids are processed or handled; and where their
release into the atmosphere could result in their ignition
by
electrical systems or equipment.
1.1.2 This recommended practice provides information on
specific flammable gases and vapors, flammable liquids, and
, whose relevant combustion properties
have been sufficiently identified to allow their classification
into the groups established by NFPA 70,
National Electrical
Code® (
NEC®), for proper selection of electrical equipment in
hazardous(classified) locations. The tables of selected combustible
materials contained in this document are not intended
to be all-inclusive.
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