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

Class III Areas

Summary

Summary

Ignitible fibers and flyings that may be ignited by electrical equipment and wiring must be isolated from the electrical ignition sources. Equipment is required to be dusttight generally, but surface temperatures must be controlled so that fibers or flyings are not ignited by contact with surfaces, including surfaces where fibers or flyings may collect. Some equipment is required to be identified for Class III areas, but most equipment must simply be dusttight. It must also be marked with a maximum surface temperature if the equipment produces heat. The maximum surface temperatures are quite low compared to most equipment used in Class I or Class II areas. Lower temperatures are required where equipment is subject to overloading. The wiring methods that may be used include those that are suitable for Class I or Class II areas but a few additional wiring methods are permitted, such as rigid nonmetallic conduit (RNC). Class II equipment may be used in Class III areas because it is dusttight, but surface temperatures must be limited to sufficiently low values.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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