Register Here | Login | My Account | Shopping Cart | Customer Service | Search| Items in Cart (0) | Quotes (0)
Call 1-800-369-6671
(Military/Intl Sales - 214-616-6180)

Vast Inventory for Fast Shipping. Custom Builds Available, Rentals and Sales.
Most items in stock for fast shipping!! UPS Ship Map Credit cards & Paypal Accepted
Home - Articles You're NOT logged in, Please log in   

Company Information

Product #:

ATEX and IEC Ex Flame-proof Explosion Proof Lighting & Equipment
Explosion Proof Lights
Explosion Proof Motors - Motors for Hazardous Locations
Industrial and Vaporproof Emergency Failsafe Lighting
Industrial Cord Reels and Tool Taps
Industrial Work Area Heaters
Machine Vision Lights
QC Series Industrial Portable Lighting - Quick Change Mount
Rig Lights
Stadium lights
String Lights and Temporary Light Stringers
Tank Cleaning Lights
Three Phase Motor Soft Starters
Vapor Proof LED Lights
Variable Frequency Drives (VFDs)
Vehicle Mounting Plates
Workboat Light Fixtures & Lighting Equipment
Yacht Engine Room Lights
Color Changing LED RGB Lighting
Explosion Proof Cord Reels
GOLIGHT Spotlights
Larson FUTURE - Lease Lighting
Remote Area Lighting and Scene Lights
Utility Bucket Mount, Receiver Hitch & Trailer Mount Lighting
Aevum Control Lighting and Equipment - IIoT
Butane and Solvent Extraction Room Lighting and Equipment
DC to DC Transformers and Power Supplies
Explosion Proof Fans & Blowers
Explosion Proof Paint Spray Booth Approved Lights
Explosion Proof String Lights
Explosion Proof Switchgear & Controls
Fleet Service Lights and Lighting Equipment
Industrial Equipment Trailers
Industrial Handlamps & Droplights
ISO 14644/FS-209E Clean Room Lighting
LED Blasting Lights
Night Time Fishing Lights
Portable AC Power Supply Units
Portable Power Distribution Panels
Power Distribution Panels with KVA Transformers
Self-Contained Lighting
Service Pit Lighting
Solar Generators & Solar Powered Lighting
Agricultural Farm Equipment Lighting & Beacons
Explosion Proof Cameras & Surveillance Systems
Explosion Proof Emergency Lights
Explosion Proof Heaters
Garage & Gas Station Canopy Lights
LED Grow Lights
LED Lights
NDT Ultraviolet Lights
Portable Hazardous Location Lighting
Radio Communication Towers and Equipment
Salt Water Processing Equipment
Shelter & Tent Lighting
Thermal Monitoring Cameras and Systems
48V LED Equipment Lights
ATEX Rated Explosion Proof Lights
Automotive Lighting
Class Rated Signals, Alarms, and Systems
Hazardous Location Area Lights and Portable Lighting
HID Equipment Lights
Hot Work Permit Lighting and Equipment
Hunting Lights
Industrial lasers
Industrial Transformers
Light Towers
Outdoor Lighting
Remote Security and Surveillance Systems
Temporary Construction Lights
Vehicle Mounted Spotlights
Equipment & Heavy Machinery LED Light Package Fitouts
Phase Converters - Single to Three Phase
Marine Shore Power Cords and Equipment
24 Volt Military Lights
Disaster Relief / First Responders / Search & Rescue Lighting
Plastic Handcuff Key
110/120 Volt Flood Lights
Post Mount Spotlights
Magnetic Work Lights
Crank-up Light Masts
Intrinsically Safe Lights
Military Flashlights
LED Waterproof Lanterns
Work Area Lights
12 Volt Flood Lights
Boat Spotlights
New Boat Lights
HID Boat Lights
Boat Dock Lights
Remote Control Lights
Control Lights
Tow Lights
Magnetic Control Lights
NEW Lights and New Products
Evaporative Coolers
Police Equipment
AC/DC Transformers
Power Supplies
Military Spotlights 24V
Infrared Filters, Covert Covers, and Blackout IR Lenses
Military Equipment
Ultralife Batteries
Remote Control Pan Tilt Base
Larson Electronics Spotlights
Larson Electronics Parts
Replacement Lamps
Cords - Brackets
Portable Wheeled Generators
Non-Hazardous Location Extension Cords / Plugs / Outlets
HID Work Lights
HID Dive Lights
HID Off Road Lights
Acro Lights HID Lights
Halogen Lights
Acro Light Flashlight
Xenon HID Flashlights
Powerlight Flashlight
HID Flashlights
Xenon Flashlights
LED Status Lights
Forklift Lights
Tractor Lights
HID Post Mount Lights
Roof Mount Lights
Post Mount Light parts
Flashlight Holder
Magnet Spotlight Base
Tripods-Magnetic Base
Recharging Spotlights
Fire Rescue Lights
LED Street Lights
Utility Lights
Hazard Lights
Strobe Lights - Battery Operated
Strobes & Beacons
Strobe Light Bars
Headlights - Headlamps - Hard Hat Lights
Suction Mount Lights
Magnetic Spotlights
12/24 Volt Spotlights
Gifts For Men
New 12 / 24 Volt Lights
Explosion Proof Accessories and Replacement Parts
Explosion Proof Lighting
Explosion Proof Hand Lamps (Drop Lights)
Explosion Proof Lights - Stand/Dolly
Explosion Proof Tank Lights
Explosion Proof Phones and Intercoms
Explosion Proof Extension Cords
Black Friday & Cyber Monday Specials
Crane Lights
Explosion Proof Light Rentals
General Light Rentals
Light Tower and Light Plant Rentals
Power Distribution Rentals
Power Plant Lighting
Refinery lights
Environmental Services Lights
Aerospace Lights
Chemical Plant Lights
Food Grade Safe Lights
Film and Entertainment Lights
Handheld Meters and Devices
Waste Water Treatment Lights
Mining Lights
Ship Yard Lights
Work Site Lighting

12/05/12 Explosion Proof Protection Against Combustible Dusts

Article-December 2012 By Larson

Explosion Proof Infrared LED Light

Larson Electronics Explosion Proof Infrared LED Light

Dusts and fine particulates pose a major safety issue in many work environments due to the unusual properties materials can possess when ground or otherwise divided into fine particles. In many cases it is the nature of the material making up the dust itself that poses a serious health hazard, such as with materials deemed toxic or otherwise poisonous. In other cases, dusts can be a serious irritant, lodging within lungs and nasal cavities where it can eventually lead to infections and respiratory issues. One of the most serious dangers dusts pose, however, is the threat of fire or explosion if exposed to an ignition source. Almost any type of material, from iron to wheat, can become explosively flammable when ground into fine particulates, and in many cases little more than a spark is all that is needed to produce this ignition.

Many industrial processing and manufacturing operations produce prodigious amounts of dust as a normal byproduct of their operations. The processing of foodstuffs, milling and cutting of wood products, and machining of metals all produce great amounts of dust that must be properly dealt with if safety is to be maintained. As we noted, most materials can become flammable and explosive when ground into fine particles. The ignition temperature and energy potential of these particles varies depending on the types of materials and how finely they are divided. Generally speaking, however, the finer a material is ground, the easier it is to ignite.

Metal dusts can pose an additional problem as although they are ground up and finely divided into particles, they have not lost their ability to conduct electricity. These are known as electrically conductive dusts, and they can pose a serious problem if they manage to contaminate the inner workings of machinery; particularly electrical motors, switches, wiring and controls. This dust can accumulate and cause shorts which can lead to ignition of the dusts. They can also cause overheating and sparking within electrical motors and moving parts of machinery, again leading to ignition.


 All dusts can also cause thermal problems as they act as an insulator when they accumulate. A light fixture for example may operate at an acceptable temperature under normal conditions because air is free to flow over and through the fixtures surfaces, thus allowing the housing to dissipate heat. When dust accumulates on top of the fixture however, it acts as an insulating blanket, preventing the fixture from radiating excess heat, leading to the housing becoming hotter than is acceptable and potentially producing a fire or explosion hazard.

As can be imagined, protecting against the hazards of combustible dusts is a major issue in the industrial workplace. Although OSHA is slowly moving to provide effective regulations regarding combustible dust, to date is has been mostly up to operators to figure out the best ways to provide protection and the levels of protection needed. Fortunately, the National Fire Protection Agency NEC publications provide excellent guidelines concerning protection in hazardous environments. As with explosion proof and intrinsically safe lighting designed for use in environments where flammable gases and vapors are present, dusts also are included with the NEC hazardous location classification system. This means that operators can refer to these guidelines just as they do with gases and vapors with a great degree of confidence that the requirements of their particular conditions will be addressed.

Class 2 light fixtures can be used in locations where combustible dusts are or may be present. Class 2 Division 1 or 2 fixtures may be used depending on the frequency of their presence as noted under these divisions. What is of particular importance for operators seeking light fixtures suitable for use around combustible dusts are the group ratings of the fixtures in question. Group ratings specify the types of dust the fixture is rated against.

This is important because as we noted earlier, the properties of dusts can vary widely according to the type of material the dust is derived from, how finely it is divided, and in the case of conductive dusts, whether or not they can pass electrical current. The following is the basic rundown of Groups for explosion proof light fixtures approved for use in environments where combustible dusts are present. You’ll note, each group holds a specific type of dusts according to material types and conductivity, underscoring the importance of choosing properly rated equipment.

Dust Groups-

Group E refers to conductive combustible metal dusts such as aluminum and magnesium as well as alloys made from these materials.

Group F refers to carbon type dusts such as coal, charcoal, carbon black, and similar materials.

Group G refers to organic and synthetic dust compounds such as flour dust, sugar dust, starch, wood, plastics, composites, and dust from chemically derived materials.

Also important to note is the “T”, or Temperature Rating of the fixtures. This rating designates the safe operating temperature range of equipment according to the ignition temperature of the materials it will be exposed to. Also note, these T ratings take into account the insulating effect of dusts, hence the “suspended / layered” notifications.  The chart below covers some of the more common dust types encountered in industrial operations.

NEC Temp Codes


Ignition Temps

T1- 450°C 842°F

Suspended - Layered

T2- 300°C  572°F


490 - 430°C

T2A- 280°C  536°F


500 - 200°C

T2B- 260°C  500°F


490 - 430°C

T2C- 230°C  446°F


460 - 240°C

T2D- 215°C  419°F


380 - 225°C

T3- 200°C  392°F


540 - 200°C

T3A- 180°C  356°F

Soy Meal

540 - 340°C

T3B- 165°C  329°F


570 - 440°C

T3C- 160°C  320°F

T4- 135°C  275°F

T4A- 120°C  248°F

T5- 100°C  212°F

T6- 85°C  185°F

As well as ensuring that equipment is properly rated for use in hazardous environments containing dusts, it is also very important that good housekeeping practices are followed.

Managing dusts as they are produced by employing dust catching devices and equipment, ensuring proper ventilation of the work area as well as equipment, and keeping to a regular schedule of dust collection and cleanup is all a part of providing comprehensive protection against the dangers of combustible dusts and will help to ensure compliance with local and regional regulations as well as provide the highest degree of worker safety possible.

Related Categories/Products
Category/Product (click on link below for more information)
Explosion Proof Fans & Blowers
Explosion Proof Fluorescent Lights
Explosion Proof LED Lights
Static Conductive Duct for EPF-30P Explosion Proof Fan / Blower - 12" OD by 25 feet
Explosion Proof Fluorescent Handheld Light - Class 1 Division 1 and Class II Division 1
Static Conductive Duct - EPF-8P and EPF-10P Explosion Proof Blowers - 8 inch OD - 25 foot long -
Explosion Proof Fan (Blower) - Electric - Portable - Hazardous Location Ventilation - Intl - 220V
Aluminum Coupler for Explosion Proof Ventilation Fan Ducts
30W Explosion Proof LED Light - Inline Transformer - 90-305VAC or 127-431VDC Stepped Down to 12VDC
Explosion Proof Paint Spray Booth LED Lighting - 2 Foot, 2 Lamp Fixture - Class 1, Div. 1
Explosion Proof Emergency Fluorescent Light Combination - 4 foot - 2 T8 lamps - Class I, Div I
Explosion Proof 15 Watt Fluorescent Drop Light - Class I, Div. I - 50' SOOW Cord w/ Exp. Proof Plug
Explosion Proof Compact LED Handlamp - Class I, Div. I - 100' SOOW Cord - 5 Watt LED - 400 Lumen
Explosion Proof Compact Fluorescent Drop Light - 26 Watt Bulb -1700 Lumen - 50' SOOW Cord w/ Exp. Pr
Explosion Proof LED String Lights - 10 lights - 5 Foot Spacing - Class 1 Division 1 and Class 2 Divi
Electric Explosion Proof 16" Blower Ventilator - 4450CFM- 220VAC - C1D1 - 30' Cord w/ 6-20P Cord Cap
Class 2 Division 1 Explosion Proof 150 Watt High Bay LED Light Fixture 17,500 Lumens - C1D2 / C2D1
Home | Contact Us | Return Policy | Privacy Policy | Security Policy | Copyright © 2006-2018. All Rights Reserved.