NFPA 70 (National Electrical Code, NEC) Article 500-505 covers electrical installations in hazardous locations and includes specific grounding requirements for Class I, II, and III areas. Metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal noncurrent-carrying parts that are to serve as grounding conductors, with or without the use of supplementary equipment grounding conductors, shall be effectively bonded where necessary to ensure. Zone Classification: Explosive atmospheres are categorized into zones according to how often and for how long explosive gasses or particles are present. Zones 0, 1, and 2 handle gases and vapors, while Zones 20, 21, and 22 handle dust. Proper grounding procedures must meet the unique criteria of. The answer lies in explosion proof wiring—specialized electrical infrastructure designed to contain or isolate potential ignition sources before they can interact with explosive atmospheres. We'll blend insights from field experiences and code requirements to give you clarity you can actually apply—no technical jargon fluff. ) discharge or spark at all Ovintiv field worksites. 1 of the. In environments where explosive materials are present, the grounding of electrical equipment is a critical safety measure.