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NOTE: This is an unformatted excerpt from our online fire protection training library.

Classification Basics

Electrical Equipment

Electrical Ignition Sources

A primary reason for classifying areas is to identify those areas where special electrical wiring and equipment are needed. Special wiring and equipment are needed in such areas to keep the electrical system from providing an ignition source for the flammable or combustible materials that cause the areas to be classified. One way of eliminating the electrical equipment as an ignition source is to move it outside the classified area move it outside the classified area
This technique is commonly used in spray booths where the lights are installed behind transparent or translucent panels and are outside the classified areas that are inside the booth and around openings to the booth. The spray booth shown here illustrates this type of application. . Often however, some electrical equipment must be located in a classified area must be located in a classified area
Equipment in oil refineries and gasoline dispensers are examples of equipment that cannot reasonably be moved outside the classified areas., and in those cases special methods and equipment must be used to isolate ignition sources from the hazardous materials. Electrical equipment may be an ignition source because of arcs and sparks or high temperatures that may be produced during normal operation or by faults or other abnormal conditions.

Code Example
NOTE: This is an unformatted excerpt from our online fire protection training library.

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