Class II Division 2 exit signs are built for dusty hazardous locations where combustible dust may be present under abnormal conditions. These LED fixtures carry UL 844 (hazardous location) and UL 924 (egress) listings and use sealed, dust-tight enclosures to maintain compliant EXIT visibility in feed mills, coal/char facilities, plastic processing, grain handling, and similar environments. See also hazardous location exit signs and die-cast aluminum exit signs.
Housings are heavy-duty die-cast aluminum or fiberglass-reinforced polycarbonate with full gaskets, sealed push-to-test, impact-resistant lenses, and corrosion-resistant hardware. Many models add NEMA 4X / IP66 ingress protection for wash-down or outdoor exposure.
Legends are LED illuminated in red or green with high contrast and field-selectable chevrons. Most units support dual 120/277 VAC input and include maintenance-free batteries (sealed Ni-Cd or lithium) that provide at least 90 minutes of emergency illumination. Mounting options typically include wall, ceiling, or pendant/conduit to suit industrial layouts. Optional self-testing diagnostics automate monthly/annual checks to simplify compliance.
Need a different classification? Compare Class I Div 2 exit signs for gas/vapor hazards, or Class II Div 1 exit signs for areas with frequent or continuous dust exposure.
Specification tip: Verify dust group (E/F/G), maximum surface temperature rating (°C), ambient temperature, and ingress protection in the product submittal before installation.
1 Product
It designates areas where combustible dusts (Groups E/F/G) are present only under abnormal conditions (e.g., leaks or upset). C2D2 signs are built so normal operation won’t ignite dust-laden air.
Not necessarily. Many C2D2 products rely on sealed, dust-tight, non-sparking designs. “Dust-ignition-proof” enclosures are more typical of Class II, Division 1. Always verify the nameplate and UL listing.
Look for UL 844 (hazardous location) and UL 924 (egress). The nameplate should show Class II, Division 2, dust Group(s) E/F/G, maximum surface temperature (°C), and ambient rating.
Combustible dust can smolder or ignite on hot surfaces. The fixture’s surface temperature must stay below the dust’s ignition temperature at the specified ambient range.
Often yes. NEMA 4X/IP66 adds wash-down and outdoor protection and helps keep dust out. Match the enclosure rating to site conditions and the submittal.
Uniform LED legends in red or green with high contrast are common, along with field-selectable chevrons for wayfinding. Verify any jurisdictional color requirements.
Per UL 924, compliant units provide at least 90 minutes of emergency illumination. Check the cut sheet for emergency lumen output and recharge time.
Typical chemistries are Ni-Cd or lithium, paired with solid-state charging and automatic transfer electronics sized for the required runtime and ambient temperature range.
Wall, ceiling, end, and pendant/conduit mounting are common. Most units accept 120/277 VAC and use sealed NPT hubs and hazloc-rated glands to maintain enclosure integrity.
C2D2 addresses dust hazards (Groups E/F/G), while C1D2 covers gas/vapor hazards (Groups A–D). Each requires specific markings, enclosure methods, and temperature limitations.