You're building a hydrocarbon extraction room — butane, propane, ethanol, sometimes CO₂ blends. The licensed producer down the road just got fined because their inspector failed the lighting on opening day. The whole room is Class I, Division 1 the moment solvent flows. Here's exactly what passes ESA and RBQ inspection, and what doesn't.
What hazard you're dealing with
Closed-loop extraction systems use solvents heavier than air with autoignition temperatures around 285–470 °C. Even tight systems leak — fittings, gaskets, transfer hoses. The room atmosphere is continuously or frequently above the lower explosive limit during normal operation, which is the textbook definition of Division 1. NFPA 497 and most provincial AHJs treat the whole extraction room as C1D1, plus a Division 2 buffer zone outside the door.
How the code classifies the room
| Where | Classification | What you need |
|---|---|---|
| Extraction room (entire volume) | Class I, Division 1, Group D | Explosion-proof, UL 844 / CSA C22.2 No. 137 |
| Within 3 ft of door / pass-through | Class I, Division 2, Group D | Vapor-tight or explosion-proof |
| Solvent storage cabinet / room | Class I, Division 1 or 2 (depends on volume) | Same as primary room |
Group D covers butane, propane, ethanol — the standard extraction solvents.
The lighting
- Fixture type: Class I Div 1 linear LED or low-profile high-bay, fully sealed enclosure with cast aluminum or stainless body.
- T-code: T4 minimum. Some inspectors push for T3C if you're running pentane or warmer solvents — verify with your AHJ.
- IP rating: IP66+. Wash-down compatible because most rooms get scrubbed weekly.
- Light level: 500–750 lux at the working surface. Operators need to read pressure gauges and check sight glasses.
- CRI: 80+ is fine for extraction. Color isn't critical.
- CCT: 5000 K daylight.
- Interlock: Lighting and room power must shut down if exhaust ventilation fails. Most AHJs require this even though NFPA 497 only mandates it for the extraction equipment.
Cables & accessories — yes, we supply these too
Inside the extraction room you'll run MC-HL or TECK90-HL with CSA C22.2 No. 174 glands at every penetration. Sealing fittings within 18 inches of every fixture, every JB, every wall pass-through. Most lighting suppliers leave you to source those separately — we ship them with the fixtures so your contractor doesn't open the box and find a missing seal-off on a Friday afternoon.
Quebec rule
The RBQ classifies cannabis extraction rooms as Class I, Division 1 by default. Quebec licensed producers (under the SQDC supply chain) need RBQ approval on the electrical drawings before construction. Bill 96 requires French safety labeling on imported fixtures — we handle that. Hydro-Québec's Programme Solutions efficaces covers up to 90% of LED conversion costs.
Ontario rule
In Ontario, ESA requires a notification + inspection for any new C1D1 install. ESA Bulletin 18-1-21 spells out classification practice. Most Ontario LP build-outs (under OCS) cluster in southern Ontario and Niagara — your inspector will know the drill. Save On Energy's Retrofit Program covers up to 50% of eligible project costs.
Common questions
Can I use a regular industrial LED in a closed-loop room? No. Even with closed loops, NFPA 497 + most AHJs treat the room as C1D1. A non-rated fixture fails inspection and voids your facility insurance.
Why is the whole room Division 1 if my system is closed? Because "closed loop" assumes ideal operation. Code is built around realistic failure modes — a hose pops, a gasket weeps, a transfer fitting drips. The room must be safe under those conditions.
My T-rating is T3C. Is that good enough? Yes for butane (autoignition 287 °C — T3C max surface 160 °C is below). For pentane or warmer solvents, push to T4 or T5 just to be safe.
Do my emergency lights need to be C1D1 too? Yes. UL 924 + UL 844 combined listing — the fixture must hold both certifications. We carry combo emergency / exit signs for C1D1.
Can the lights be on the same circuit as the exhaust fan? The interlock requirement is what matters. Both have to shut down together if the exhaust fails. Same circuit is fine if interlock is wired correctly.
Talk to a specialist
Building a C1D1 extraction room? Send us your room dimensions, solvent type, and exhaust spec — we quote the whole lighting + accessory package same day. Or browse Class I Division 1 fixtures.
Sources: NFPA 497, NFPA 30, RBQ Classification, ESA Bulletin 18-1-21, Hydro-Québec Solutions efficaces, Save On Energy, Cannabis Engineering, Advanced Extraction Labs.
Spec'ing a project? We quote the whole package — fixtures, cable, glands, sealing fittings — same day.