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Class I Division 2 Emergency Lights – Explosion‑Proof Fixtures

Class I Div 2 Emergency Lights – C1D2, UL 844/924 (NEMA 4X/IP66)

Class I Division 2 emergency lights (C1D2) are engineered for hazardous industrial areas where flammable gases or vapors may be present under abnormal conditions. These explosion-resistant fixtures carry UL 844 hazardous-location and UL 924 emergency lighting listings to help prevent ignition while delivering code-required egress illumination. Explore emergency lights, compare wet-location emergency lights, or extend coverage with remote-capable emergency lights.

UL 844 / UL 924 C1D2 Rated NEMA 4X / IP66 LED or MR16 90-Min Backup Self-Testing
Buyers Guide Tips

What to Look for in Class I Div 2 Emergency Lights

  • Hazardous listing: UL 844 Class I, Division 2 with correct gas group (IIA/IIB/IIC).
  • Temperature code: T-rating (e.g., T4/T6) suitable for the classified area.
  • Enclosure rating: NEMA 4X / IP66 for wash-down, dust, and corrosion resistance.
  • Construction: Die-cast aluminum or fiberglass-reinforced body; impact-resistant lens; corrosion-resistant hardware.
  • Light source: High-output LED heads or MR16 (spot/flood) to meet spacing and foot-candle targets.
  • Power & runtime: 120/277 VAC input, minimum 90-minute battery backup, solid-state charger/transfer.
  • Options: Self-testing diagnostics, remote capacity, cold-temperature packages, and sealed conduit entries.
What does Class I Division 2 mean?
C1D2 covers areas where flammable gases or vapors are present only abnormally (e.g., leaks). Fixtures limit arcs, sparks, and surface temperature to avoid ignition while maintaining code-required egress illumination.

Housings are heavy-duty die-cast aluminum or fiberglass-reinforced with gasketed enclosures, impact-resistant lenses, and corrosion-resistant hardware. The NEMA 4X / IP66 seal protects against water, dust, and wash-down for use in refineries, chemical plants, paint shops, and grain handling facilities.

Choose high-output LED heads for efficiency and long life, or MR16 (halogen/LED) for tight beam control. Integrated, maintenance-free batteries (lithium or Ni-Cd) supply a minimum 90 minutes of runtime. Many models include universal 120/277 VAC input, remote-capable outputs, and self-testing diagnostics to automate monthly/annual checks.

For non-explosive but harsh sites, consider wet-location emergency lights or sealed NEMA-rated emergency lights for corrosive, dusty environments.

Specification tip: Verify gas group, T-code, ambient rating, mounting height, and ingress protection in each product’s submittal before installation.

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Class I Division 2 Emergency Lights Spec Guide

Spec Snapshot

  • Compliance & Markings: Dual-listed UL 844 (HazLoc) and UL 924. Nameplate must state Class I, Division 2, applicable gas Group(s) (e.g., A–D), and T-code (e.g., T4/T6). Verify with the submittal and AHJ.
  • Enclosure & Ingress: Gasketed NEMA 4X / IP66 housings (die-cast aluminum or fiberglass) with corrosion-resistant coatings, impact-resistant lensing, and sealed hardware for wash-down and dusty areas.
  • Light Source & Optics: High-output LED heads (or MR16 halogen/LED) with spot/flood distributions and adjustable aim. Review photometric spacing at planned mounting height to meet egress targets.
  • Battery & Electronics: Maintenance-free Ni-Cd or lithium (Li-ion/LiFePO4) providing ≥90 minutes. Solid-state charger with low-voltage disconnect, AC lockout, brownout detection, test button & status LED; self-testing available.
  • Temperature & T-Code: Confirm ambient rating (e.g., −20 °C to +40 °C or per model) and T-code versus process gas auto-ignition temperature. Higher ambient or tighter T-codes may change model selection.
  • Mounting & Conduit: Wall/ceiling brackets with sealed entries; common NPT hubs (e.g., 1/2" or 3/4") and stainless fasteners. Ensure cable glands/fittings carry matching C1D2 ratings.
  • Options & Remote: Remote-capable outputs on select units (verify available remote wattage/runtime), wet/cold-weather packages, and marine/chemical-resistant finishes where corrosion is a concern.

FAQs About Class I Division 2 Emergency Lights

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

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

Are C1D2 fixtures “explosion-proof”?

Not necessarily. Many C1D2 products are nonincendive rather than explosion-proof. “Explosion-proof” enclosures are typically used for Class I, Division 1. Always check the nameplate and UL listing to confirm construction type.

Which listings should I look for?

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

What is a T-code and why does it matter?

The T-code is the maximum external surface temperature of the fixture. It must be lower than the auto-ignition temperature of the process gas to prevent ignition risk.

Do I need NEMA 4X or IP66?

In wash-down, outdoor, or dusty environments, NEMA 4X/IP66 enclosures are common to protect against water and particulates and to resist corrosion. Match the rating to actual site conditions.

How long is the emergency runtime?

Emergency operation must provide a minimum of 90 minutes per UL 924. Check the submittal for exact lumen output during emergency mode.

What lamp types are available?

Most units use high-output LED heads for efficacy and life; some offer MR16 (halogen or LED) for tighter beam control (spot/flood).

What batteries are used?

Common chemistries are Ni-Cd or lithium (Li-ion/LiFePO4). Confirm ambient tem