What is considered a hazardous location?  The National Electrical Code (NEC) defines hazardous locations as those areas “where fire or explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or flyings.”

Hazardous locations are categorized into three classes, two divisions and further broken down into groups.  Class I includes those areas in which flammable gases or vapors may be present in the air in sufficient quantities to be explosive orIMG_0208 ignitable.  Class II are areas which are made hazardous by the presence of combustible dust and Class III are those areas in which there are easily ignitable fibers or flyings present due to the type of material being handled, stored or processed.

Division 1 refers to normal operations, i.e., the hazard would be expected to be present in everyday operations or during frequent repair and maintenance activity.  Division 2 relates to abnormal situations whereas the combustible material is expected to be confined within closed containers or systems and will be present only through accidental rupture, breakage or faulty operation.

The gases or vapors in Class I locations are broken down into four groups by the code, A, B, C and D.  These materials are grouped according to the ignition temperature of the substance, its explosion pressure and other flammable characteristics.  Class II dust locations are grouped by the code E, F and G according to the ignition temperature and the conductivity of the hazardous substance.

Weedon Island 1All electrical equipment, wiring, raceways and hardware used in these hazardous locations must be specifically designed, constructed and tested for an explosion proof area to ensure it is strong enough to contain and withstand any potential explosion and must function at temperatures below the ignition temperature of the surrounding atmosphere.  In addition, proper installation of hazardous location equipment calls for the use of specialized seals or fittings that are filled with a chemical compound which hardens to prevent gases or flammable dust from traveling through the conduit system and igniting other areas.

Precision Electric of Lakeland has a comprehensive history of performing work in hazardous locations safely.  All projects are completed according to strict standards and follow the associated codes as outlined in the NEC.

Call us today for more information or to speak with a project manager about your hazardous location project.