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api 500 API RP 500 Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division I. Api RP 500. This document provides recommendations for classifying locations for electrical installations at petroleum facilities classified as Class I

api36 slot login, API RP 500 defines two types of divisions: Division 1: An area in which nitable concentrations of flammable gases, vapors, or liquids.