Selecting light fittings for industrial applications can often require more than just illumination because, if the wrong type of fitting is installed in certain locations, it could destroy the building and people in it.
Standard light fittings introduce an ignition source into an explosive atmosphere, so it’s worth having a closer look at explosion zones and what type of luminaire to use for the different zones.
Common places where EX rated explosion-proof luminaires are used are areas where explosive gas, mist or vapour may be found in the atmosphere, whether it’s present because of a leak or spillage, because it’s being transferred from one form of storage to another, or because it’s used in an industrial process like refrigeration. These areas include service stations, coolstores, underground mines, vehicle inspection pits and spray painting booths.
EX rated explosion-proof luminaires are also used where there is a chance of combustible dust being present in the atmosphere because certain types of dust, in combination with oxygen in the atmosphere, can ignite and cause large explosions.
Common examples of dust areas include facilities that store or process material like timber, coal, flour, fertiliser, grain and milk powder. Sometimes there doesn’t need to be a spark to ignite the material, it can be set off by something like a hot surface on a piece of equipment. Even fabric fibres and metal filings (flyings) can combust in the right circumstances.