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Class I Div 2 Exit Signs

Class I Div 2 Exit Signs – C1D2, UL 844/924, NEMA 4X/IP66

Class I Division 2 exit signs (C1D2) are engineered for hazardous locations where flammable gases or vapors may be present under abnormal conditions. These explosion-resistant LED fixtures carry UL 844 (hazloc) and UL 924 (egress) listings to help prevent ignition while maintaining code-required visibility along paths of egress. Explore related categories: hazardous location exit signs and wet-location exit signs.

UL 844 / UL 924 Class I Div 2 NEMA 4X / IP66 LED Legend 90-Min Backup Self-Testing
Buyers Guide Tips

What to Look for in Class I Div 2 Exit Signs

  • Hazardous listing: UL 844 Class I, Division 2 with the correct gas group (IIA/IIB/IIC).
  • Temperature code: T-rating (e.g., T4/T6) suitable for the classified atmosphere.
  • Enclosure rating: NEMA 4X / IP66 sealing for water, dust, and wash-down; sealed conduit entries.
  • Construction: Die-cast aluminum or FRP body, impact-rated lens, corrosion-resistant hardware.
  • Legend visibility: Even LED illumination, high-contrast background, field-selectable chevrons.
  • Power & runtime: Universal 120/277 VAC input and ≥90-minute battery backup.
  • Mounting: Wall/ceiling/pendant options; verify hub size and accessory compatibility.
  • Diagnostics: Availability of self-testing to automate monthly/annual checks.
What does Class I Division 2 mean?
C1D2 covers areas where flammable gases/vapors are present only abnormally (e.g., leaks). Fixtures limit arcs, sparks, and surface temperature to avoid ignition while maintaining compliant EXIT visibility.

Constructed from die-cast aluminum or fiberglass-reinforced polycarbonate, C1D2 exit signs use gasketed, explosion-resistant enclosures with corrosion-resistant hardware and impact-rated lenses. The NEMA 4X / IP66 seal protects against dust, water, and wash-down—ideal for refineries, chemical processing, paint shops, wastewater facilities, and similar hazloc environments.

Legends are LED illuminated in field-selectable red or green with high-contrast backgrounds and field-selectable chevrons. Most models include universal 120/277 VAC input, maintenance-free batteries (sealed Ni-Cd or lithium) for at least 90 minutes of emergency illumination, and optional self-testing diagnostics to automate monthly/annual checks. Mounting options typically include wall, ceiling, or pendant/conduit configurations (verify hub size and accessories per submittal).

For related protection needs outside classified spaces, consider wet-location exit signs, or for zero-power maintenance in sealed areas, review self-luminous tritium exit signs.

Specification tip: Confirm gas group (IIA/IIB/IIC), temperature code (e.g., T4/T6), ambient rating, and exact ingress protection in the product submittal before installation.

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Class I Div 2 Exit Signs Spec Guide

Spec Snapshot

  • Compliance & Markings: Dual-listed UL 844 (hazardous location) and UL 924 (egress). Nameplate must indicate Class I, Division 2, gas Group(s) (A/B/C/D), and T-code (e.g., T4/T6). Verify on the submittal and with the AHJ.
  • Enclosure & Ingress: Gasketed NEMA 4X / IP66 housings with corrosion-resistant hardware and impact-rated lenses for wash-down, dust, and outdoor exposure.
  • Housing Materials: Die-cast aluminum or fiberglass-reinforced construction; sealed conduit entries and stainless fasteners for hazloc durability.
  • Legend & Readability: Uniform LED legend in red or green with high-contrast background; field-selectable chevrons. Typical 6" letters rated to ~100 ft viewing distance—confirm model rating and local code.
  • Power & Electronics: Universal 120/277 VAC input; solid-state charger/automatic transfer, low-voltage disconnect, AC lockout, brownout detection, test button & status LED. Self-testing diagnostics available on select models.
  • Battery Backup: Sealed Ni-Cd or lithium packs providing ≥90 minutes emergency operation per UL 924; check ambient rating and recharge time.
  • Mounting & Conduit: Wall/ceiling/end, pendant, or conduit-hub mounting (common NPT sizes such as 1/2" or 3/4"). Use hazloc-rated glands/seals and follow conduit sealing practices per code.
  • Options & Finish: Cold-weather packages, marine/chemical-resistant coatings, and bilingual legends where required by site policy.

FAQs About Class I Division 2 Exit Signs

What does Class I, Division 2 (C1D2) mean?

It designates areas where flammable gases or vapors are present only under abnormal conditions (e.g., leaks). C1D2 exit signs are built so normal operation won’t ignite the atmosphere.

Are C1D2 exit signs “explosion-proof”?

Not necessarily. Many C1D2 products are nonincendive (prevent arcs/sparks from igniting) rather than explosion-proof flameproof enclosures, which are more typical of Class I, Division 1. Always verify the nameplate and listing.

Which listings should I confirm?

Look for UL 844 (hazardous location) and UL 924 (egress). The nameplate should indicate Class I, Division 2, gas Group(s) A/B/C/D, and the T-code (e.g., T4/T6).

Why is the T-code important?

The T-code is the fixture’s maximum external surface temperature. It must be lower than the auto-ignition temperature of the process gas in your area classification.

Do I need NEMA 4X or IP66?

In wash-down, dusty, or outdoor zones, NEMA 4X/IP66 protects against water and particulates and resists corrosion. Match enclosure rating to site conditions and the submittal.

What legend colors are allowed?

Most C1D2 exit signs offer red or green LED legends. Acceptable color can be jurisdiction-specific—confirm with the AHJ before specifying.

What about chevrons and faces?

Field-selectable chevrons and single- or double-face panels are common to support flexible wayfinding. Verify on the cut sheet for your model.

How long is emergency runtime?

Per UL 924, emergency operation provides at least 90 minutes. Check the submittal for exact emergency lumen levels and recharge time.

What mounting and power options are typical?

Wall, ceiling, end, pendant, or conduit-hub mounting with sealed NPT entries is common. Most units accept 120/277 VAC input; use hazloc-rated glands/fittings as required by code.

Do these support self-testing diagnostics?

Many models include self-diagnostic electronics (or magnetic test access) to automate monthly and annual tests, simplifying inspection and maintenance.