Short answer: In Canada, FR rainwear worn around arc flash hazards falls under CSA Z462, the national workplace electrical safety standard, which points to ASTM F1506 for arc-rated clothing and ASTM F1891 for arc-rated rainwear. For flash fire exposure, rainwear is covered by CAN/CGSB-155.20 and ASTM F2733, with NFPA 2112 also widely accepted on Canadian sites. High-visibility requirements come from CSA Z96. Standard rain gear made from untreated polyester, nylon, or PVC can melt or ignite when exposed to an arc flash or flash fire, so always look for a labelled arc rating (ATPV or EBT) and confirmed FR performance before you head out in the rain.
Rain does not pause the job. Storm restoration, line work, and outdoor maintenance often ramp up when the weather turns, and that is exactly when the wrong rain gear becomes a real problem. A jacket that keeps you dry but melts in an arc flash is not protecting you. It is adding fuel.
This guide walks through the standards that govern FR rainwear in Canada, what the labels actually mean, and how to make sure the gear keeping you dry is also gear that has your back.
Why Is Regular Rainwear a Problem Around Arc Flash and Flash Fire?
Most everyday rain gear is built from synthetic materials like polyester, nylon, or PVC. These fabrics are great at shedding water and not much else. Exposed to the heat of an arc flash or a flash fire, they can ignite, keep burning, or melt directly onto your skin. Melted synthetics make burn injuries deeper and harder to treat, and a burning outer layer can compromise the FR clothing you are wearing underneath.
Wet weather does not lower the risk either. Storms bring downed lines, urgent restoration work, reduced visibility, and slippery conditions. If anything, the rain raises the stakes. That is why any rainwear worn over arc-rated clothing needs to be arc-rated itself when arc flash exposure is on the table.
What Standards Cover FR Rainwear in Canada?
Canadian requirements for FR rainwear flow from a handful of standards. Here is how they fit together.
CSA Z462: Workplace Electrical Safety
CSA Z462 is Canada's workplace electrical safety standard and the Canadian counterpart to NFPA 70E in the United States. It requires a shock and arc flash risk assessment, and where arc flash exposure is identified, it requires arc-rated clothing with an arc rating that meets or exceeds the estimated incident energy of the task. For clothing, CSA Z462 references ASTM F1506. For rainwear specifically, it references ASTM F1891. The standard applies to your outer layer too, so a rain jacket worn over arc-rated clothing must carry its own arc rating when arc flash exposure is present.
ASTM F1891: Arc and Flame Resistant Rainwear
ASTM F1891 is the specification written specifically for arc-rated rainwear. It sets minimum physical, arc flash, and thermal performance requirements for rainwear worn by workers who may be exposed to momentary electric arcs. Materials are arc tested for an ATPV or EBT rating and exposed at twice their arc rating to confirm the fabric will not melt or drip. One important note: ASTM F1891 covers thermal protection only. It does not address electric shock, so rainwear never replaces rubber insulating equipment.
CAN/CGSB-155.20, ASTM F2733, and NFPA 2112: Flash Fire Protection
For oil and gas and other environments where hydrocarbon flash fire is the hazard, Canada's own standard is CAN/CGSB-155.20, Workwear for Protection Against Hydrocarbon Flash Fire. It uses the instrumented manikin test with a three-second flash fire exposure and includes additional testing requirements written specifically for FR rainwear. ASTM F2733 is the dedicated specification for flame-resistant rainwear against flame hazards, and NFPA 2112 remains widely accepted on Canadian sites alongside CGSB 155.20. Many Canadian employers accept either, so check your company's FR clothing program before you buy.
CSA Z96: High-Visibility Safety Apparel
Rain and low light go hand in hand, so most FR rainwear in Canada also needs to meet CSA Z96 for high-visibility. On FR rain gear, the reflective tape itself should be fire-resistant so your hi-vis striping does not become a liability during a thermal event.
What Does the Vertical Flame Test Actually Tell You?
You will sometimes see rainwear marketed as flame-resistant based on ASTM D6413, the vertical flame test. That test measures how a fabric sample behaves when held over a controlled flame. It is a useful fabric screening tool, but it is not a garment protection specification, and passing it alone does not make rainwear arc-rated or flash fire compliant. Some fabrics that pass a vertical flame test still melt or break open under real arc flash or flash fire energy. If your job involves those hazards, the label needs to show an arc rating and compliance with the appropriate garment standard, not just a flame test result.
What Should You Look for on the Label?
Before you trust a rain jacket on a wet worksite, check for four things. First, a stated arc rating in cal/cm², shown as ATPV or EBT, that meets or exceeds the incident energy identified in your hazard assessment. Second, the arc flash PPE category, such as CAT 2, which corresponds to a minimum arc rating of 8 cal/cm². Third, the standards the garment is tested to, whether that is ASTM F1506, ASTM F1891, NFPA 2112, or CGSB 155.20, matched to the hazard you actually face. Fourth, CSA Z96 hi-vis compliance with FR reflective tape if visibility is part of your requirements. If a manufacturer cannot show you third-party test results, that tells you something too.
Which FR Rain Jacket Has Your Back in Canadian Weather?
The MWG STORMSHIELD™ Men's FR Rain Jacket (85H10) was built for exactly this. It is made with MWG's proprietary STORMSHIELD™ fabric, an inherent flame-resistant ripstop that has been laminated for complete wind and waterproofness. The FR performance is woven into the fibre itself, so it will not wash out or wear off over the life of the garment.
The numbers hold up on the safety side and the weather side. The jacket carries a 10 ATPV arc rating, placing it in CAT 2, and is tested to ASTM F1506 and NFPA 2112 with CSA Z96 hi-vis compliance through 2-inch FR silver segmented reflective tape. It is 100% waterproof at double the standard requirement for waterproofness, with four times the standard requirement for tear strength and factory-tested seams. Every detail is FR, right down to the zipper, drawstrings, and reflective tape, and it is made in Canada. A detachable hood, elastic storm cuffs, and a waist drawstring keep the weather out without slowing you down.
Pair it with the STORMSHIELD™ FR Rain Pant (69H13) for sealed-seam coverage head to toe, and browse the women's FR rainwear collection for fits designed for women on the same worksites.
How Does FR Rainwear Work With the Rest of Your FR Layers?
FR rainwear is an outer layer, and it works as part of a system. Under CSA Z462, meltable fibres have no place in the layers against your skin, and if you are wearing non-arc-rated layers underneath, they need to be fully covered by arc-rated garments with enough combined protection that the innermost arc-rated layer holds together at the expected incident energy. Arc ratings of individual garments cannot simply be added together, which is why tested combinations matter. MWG tests its FR collection as certified combinations, so you know how your rain shell, work shirt, and base layer perform together rather than guessing at the math. If you are building out your layers, the MWG Layering Combination Calculator shows you tested pairings and their combined ratings.
Common Questions About FR Rainwear in Canada.
Can I wear a regular hi-vis rain jacket over my FR clothing?
Not if arc flash or flash fire exposure is part of your job. A standard polyester rain shell can ignite or melt in a thermal event, which puts you at greater risk even with FR layers underneath. Your outer layer needs to be arc-rated or flash fire compliant, matched to your hazard.
What does CAT 2 mean on a rain jacket?
CAT 2 is an arc flash PPE category under CSA Z462 requiring a minimum arc rating of 8 cal/cm². A jacket rated 10 ATPV, like the STORMSHIELD™ FR Rain Jacket, meets CAT 2 with room to spare.
Does rain lower the arc flash risk?
No. Wet conditions often mean urgent work, poor visibility, and equipment under stress. The electrical hazard is still there, and your protection needs to be too.
Does FR rainwear protect me from electric shock?
No. FR and arc-rated rainwear protects against the thermal energy of an arc flash or flame. Shock protection comes from rubber insulating equipment and safe work practices, never from clothing alone.
Is ASTM F1891 mandatory in Canada?
ASTM F1891 is the rainwear specification referenced by CSA Z462 for arc-rated rainwear. Employers set their FR clothing requirements based on their hazard assessment, and many Canadian programs accept arc-rated rainwear tested to ASTM F1506 or F1891 with an arc rating suited to the identified incident energy. Always confirm the specific standards your program requires.
Wet weather is part of the job in Canada, and being dry should never come at the cost of being protected. If you are ready to upgrade your rain gear, explore the full MWG FR rainwear collection, all third-party tested with full results available on request, or reach out to the MWG team for help matching gear to your site's requirements.