Chemical storage and solvent handling areas are classified Class I, Division 1 (tank farm interiors, loading arms, pump areas) or Division 2 (surrounding areas). Gas group depends on the specific chemical: Group D for most hydrocarbons and common solvents, Group C for ethylene and diethyl ether, Group B for hydrogen-containing streams. Stainless 316L housings are required where chlorinated solvents, strong acids, or caustics may contact the camera.
NFPA 33 classifies the interior of paint spray booths as Class I, Division 1. Areas within 3 feet of booth openings are Division 2. Cameras require Group D certification (acetone, xylene, toluene — all Group D), anti-static optical windows to prevent paint adhesion, and IP66 or IP69K ratings if the booth is regularly hosed down. Stainless steel housings are recommended where solvent-contaminated water is used in cleaning.
Ammonia (NH3) is classified as Class I Group D under NEC Article 500 and IEC Group IIA under ATEX/IECEx. Refrigeration machine rooms are typically Class I Division 1; surrounding areas and compressor rooms with ventilation are Division 2. Cameras must use aluminum or stainless 316L housings — ammonia attacks copper and zinc. Low-temperature ratings to -40°C are required for cold storage environments.
Explosion-proof camera specification sheets contain two sets of data: camera performance specifications (resolution, sensitivity, compression) and hazardous area certification data (ATEX marking, gas group, temperature class). Both sets are essential. Understanding what each value means in practice — not just on paper — prevents selecting cameras that meet the spec sheet but fail the actual installation requirements.
A complete explosion-proof camera specification must define the hazardous area classification (Class/Division or Zone/Group), required certifications (ATEX, IECEx, UL), housing material and IP rating, minimum camera performance (resolution, sensitivity, IR range), and documentation requirements (certificates, installation manual, test reports). Vague specifications result in non-compliant equipment or inflated pricing on non-mandatory features.
An explosion-proof camera system costs significantly more than a standard CCTV installation. Hardware costs range from $1,500 to $8,000 per camera position depending on type and certification. Installation labor in classified areas adds 40-70% over standard CCTV due to conduit sealing, hot-work permits, and commissioning requirements. A 16-camera system with 30-day retention and VMS typically totals $80,000-$180,000 installed.
Lens selection determines how much area each explosion-proof camera covers and at what resolution. A 4mm lens covers a wide area at short range; a 12mm lens provides a narrower, longer-range view. Varifocal lenses offer adjustment flexibility during commissioning. Low-light performance depends on the lens F-number — a lower F-number (F1.2 vs F1.8) captures significantly more light at night.
The NVR (network video recorder) for an explosion-proof CCTV system must be located in a safe, unclassified area — never inside a classified zone. Key selection criteria include PoE power budget for long cable runs to hazardous areas, channel capacity, storage sizing at the required resolution and retention period, and compatibility with the video management software used by the facility.
Coverage planning for explosion-proof camera systems requires calculating field of view angles, defining detection and identification distances, and mapping camera positions against classified zone boundaries. Most industrial facilities require between one camera per 15-30 meters of perimeter and one per process area, with PTZ cameras used to reduce total count in large open areas.
ATEX is a European Union directive that is legally mandatory for equipment placed on the EU market. IECEx is an international voluntary certification scheme administered by the IEC. Both are based on the same IEC 60079 technical standards, making dual-certified equipment technically equivalent. For global projects, specifying cameras with both ATEX and IECEx certification eliminates compliance gaps across regions.
ATEX Category 1 equipment is approved for Zone 0 (gas) or Zone 20 (dust) — the most hazardous zones. Category 2 covers Zone 1/21, and Category 3 covers Zone 2/22. Selecting the wrong category for a zone is a compliance violation. Most explosion-proof cameras are Category 2, rated for Zone 1 and Zone 2 installations.
NEC Article 500 uses a Division system (Division 1 and Division 2) to classify Class I, II, and III hazardous locations. Article 505 uses a Zone system (Zone 0, 1, and 2) aligned with IEC 60079. Article 500 dominates legacy US facilities; Article 505 is increasingly used on new construction and facilities operating under both US and international standards.
IP66, IP67, IP68, and IP69K each specify a different level of protection against water ingress. For most outdoor explosion-proof camera installations, IP66 is the minimum. IP67 and IP68 add immersion resistance for flood-prone or underground areas, while IP69K is required where high-pressure washdowns are performed.
Class II explosion-proof cameras must be dust-ignitionproof (UL 674 or UL 1203) and match the specific material group (E, F, or G) of combustible dust present. NEC Article 502 requirements differ from Class I — a generic explosion-proof rating is not sufficient. Covers Division 1 vs. Division 2, material groups, and industry applications for grain, coal, pharmaceutical, and metal dust environments.
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