The safety and economic impact of unintentional ignition of explosive mixtures is something that should

never be underestimated when processing, storing, generating or transporting combustible liquids, gases or

dusts. Where hazardous atmospheres can exist, electricity should be a primary concern of every engineer and

system designer. Hazardous atmospheres can exist not only in the more common surroundings of industrial,

chemical, and environmental facilities, but also in many less obvious environs where dust is present, where gas

can accumulate, and where combustible gas-forming reactions occur. To minimize risks in such areas, it is

necessary to design specific hazard-reducing electrical systems. Most electrical equipment is built to specific

standards aimed to reduce the incidence of fires and human casualties. The majority of such incidents can be

attributed to poor or defective installations, improper use of approved equipment, deteriorated equipment,

and accidental applications. In combination with an explosive atmosphere, these factors can result in

extremely dangerous conditions. Designing an electrical system for a hazardous location requires careful

planning, research, engineering, and ingenuity in using proper protection techniques to develop better

applications and classifications that reduce hazards.