API RP 505:2025 pdf download – Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1 and Zone 2

API RP 505:2025 pdf download,Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1 and Zone 2.
This recommended practice (RP) aims to provide direction on classifying Zones 0, 1, and 2 in petroleum facilities, facilitating the proper selection and installation of electrical equipment. The guidelines outlined in this RP are based on the core definitions established in the 2023 edition of NFPA 70, also known as the National Electrical Code (NEC). It is important to note that this document is intended as a guide and requires the application of sound engineering judgment.

Electrical installations in areas where flammable liquids, gases, or vapors are produced, processed, stored, or otherwise handled can be effectively designed by clearly defining the locations of potential release and accumulation sources. Once a location is classified, the requirements for electrical equipment and associated wiring should refer to applicable standards and publications, including NFPA 70 (NEC), CSA C22.1 (Canadian Electrical Code), or API 14FZ, that align with the guidance provided in this document.