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author

David Wechsler

published on

May 2017

The American Petroleum Institute (API) developed API 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2, to provide guidance for hazardous classified locations at petroleum facilities for the selection and installation of electrical equipment in accordance with National Fire Protection Association (NFPA) 70, National Electrical Code, Article 500. The Scope of API 500 states, “This document applies to the classification of locations for both temporarily and permanently installed electrical equipment. It is intended to be applied where there may be a risk of ignition due to the presence of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors, mixed with air, under normal atmospheric conditions (identified throughout this document as “gases and vapors”).”

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