If you work in a hazardous area, then you probably know that explosion proof lights can save your life. A hazardous area is anywhere the threat of fire or explosion may exist due to flammable gas, vapors, liquids, or combustible dust or fibers.
A common misconception is that an explosion proof light means the light is built to sustain an explosion. That is not true. It means that an explosion proof light is built to not cause an explosion or ignite flammable substances.
There are three classes of explosion proof lights.
Class I locations have ignitable concentrations of flammable gases, vapors, or liquids continuously or frequently in the air during normal or abnormal operating conditions.
Class II locations have ignitable concentrations of combustible dust in the air under normal or abnormal operating conditions.
Class III locations have easily ignitable fibers or materials producing combustible floating in the air under normal or abnormal operating conditions.
Each class is further broken down into divisions and groups. As you drill deeper into the classification system, there are different requirements for explosion proof lights. Note that it has come to be widespread to use Zones for the location.
When installing or using a light in a hazardous area, you must look at the grade of protection listed on the equipment to minimize the likelihood of an explosion or fire. Manufacturers will certify that their equipment meets the listed rating of Class, Division, and Group for the device. Do not use equipment that is not rated for a specific hazardous location and conditions.
Lighting plays a critical role in the safety and productivity of workers in all industries. When it comes to lighting hazardous environments, understanding the potential dangers, the classification system, and how to properly implement a lighting solution can save lives and property from destruction.