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Title: HAZARDOUS AREA CLASSIFICATION
Author: ALEX HICKS & HILLARY MATORA
Source: 2019 Western Gas Measurement Short Course
Year Published: 2019
Abstract: Hazardous (classified) areas are defined and categorized by the National Fire Protection Association (NFPA) 70, the National Electric Code (NEC). In particular, Articles 500, 501, 504, and 505 cover hazardous areas that are created by common gas utility processes. Although the NEC provides a general definition of hazardous areas and the installation requirements of electrical equipment located within them, it does not classify specific natural gas and petroleum industry processes that can create a hazardous area, nor the extent of the hazardous areas created by such processes. Instead NFPA technical committees and the American Petroleum Institute (API), among other industry-recognized organizations, determine the specifics of hazardous areas created by gas and petroleum industry processes. Two particular publications have become the de facto standards for defining hazardous areas in the natural gas and petroleum industry: the API 500 and the American Gas Associations (AGA) XL1001.

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