All were attributed to clouds of combustible dust, though in several cases the cause of the dust igniting wasn’t known, underscoring the importance of keeping any potentially hazardous heat source away from such environments.
It’s a responsibility covered in both the General Duty clause of the Occupational Safety and Health Act, which requires employers to provide a workplace free of hazards that are known to cause, or likely to cause, death or serious harm, and OSHA standards on fire prevention.
The risk of serious harm is why all equipment used in hazardous locations must be tested and approved as safe to operate, Scott Jones, Pelican’s director of lighting product management, wrote in a white paper on the topic. “As a potential source of ignition, flashlights are held to strict guidelines for these conditions.”
Industrial combustion risks are categorized in Articles 500 through 506 of the National Electrical Code, published by the National Fire Protection Association, based on class, division, group and ignition temperature, he wrote.
- Class covers the physical properties of the potentially hazardous materials.
- Class I: Flammable gases, vapors or liquids (e.g., gasoline)
- Class II: Combustible dusts (e.g., metallic dusts, sugar, cornstarch)
- Class III: Ignitable fibers (e.g., rayon, cotton, sawdust)
- Division gauges the concentration of hazardous materials.
- Division 1, or Hazard Likely: A large enough concentration to ignite is present under normal operating conditions
- Division 2, or Hazard Not Likely: A large enough concentration to ignite is only present in abnormal conditions
- Group divides materials by their flammability or explosive characteristics. Class I has four groups, from A through D, and Class II has three, from E through G. Class III materials aren’t categorized by group.
- Ignition temperature, which rates the maximum surface temperature permissible on equipment carried into hazardous areas.
- T1: 450 degrees Celsius (842 degrees Fahrenheit)
- T2: 300 degrees Celsius (572 degrees Fahrenheit)
- T3: 200 degrees Celsius (392 degrees Fahrenheit)
- T4: 135 degrees Celsius (275 degrees Fahrenheit)
- T5: 100 degrees Celsius (212 degrees Fahrenheit)
- T6: 85 degrees Celsius (185 degrees Fahrenheit)
Pelican stands out from its competitors partly because the company makes flashlights deemed intrinsically safe for all three classes, Fry notes.
“Not every flashlight manufacturer has intrinsically safe lights because they’re expensive to make and they’re hard to get certified,” she says. While Pelican’s are among the more expensive options on the market, “we’re providing a premium product that’s going to have a lifetime warranty, and we’re always trying to add upward features that customers really want.”
Which work areas at your business require intrinsically safe flashlights? Tell us in the comments below.
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