Class 1 Division 1 Junction Box

Shop NEC-rated Class I Division 1 junction boxes, commonly known as explosion proof junction boxes, engineered to safely house wiring connections, splices, and terminations in locations where flammable gases or vapors are present continuously or under normal operating conditions. These enclosures are built from heavy-duty materials such as cast aluminum or stainless steel, with flame paths and sealed joints designed to contain any internal arc or spark and prevent it from igniting the surrounding atmosphere, keeping oil and gas, chemical, and refining facilities compliant and protected. Our selection includes single-gang and multi-gang junction boxes in a range of sizes, with threaded conduit entries sized to match your existing electrical infrastructure, so electricians can terminate motor leads, instrumentation cables, and lighting circuits without introducing an ignition source. Because Class I Division 1 requirements are strict about enclosure rating, conduit sealing, and hardware torque, our specialists can help confirm the correct box size, entry configuration, and accessory hardware for your specific installation before you order. Properly rated junction boxes are a core part of any compliant electrical installation in a classified hazardous area, working alongside conduit seals, fittings, and cable glands to maintain the integrity of the explosion proof wiring system. Typical applications include oil and gas production and refining, chemical and petrochemical plants, offshore platforms, and any facility with continuously present flammable atmospheres. Browse our certified Class I Division 1 junction boxes below, filter by size and entry configuration, and contact our team for help matching a box to your electrical installation.