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Classification Basics

Electrical Equipment

Special Equipment Alternatives

In some cases, rather than use special equipment enclosures special equipment enclosures
Although many protection methods are available, typically "explosionproof" enclosures are used in Class I areas, "dust-tight" and "dust-ignition-proof" enclosures are used in Class II areas, and gasketed enclosures that exclude fibers and flyings are used in Class III areas.and wiring methods wiring methods
Wiring methods are variously restricted in classified areas. Threaded metal conduits are typically used in Class I and Class II areas to control the release of hot gas in Class I locations and exclude dust in Class II locations. Many wiring methods are available in Class III areas because the relatively large fibers and flyings are easier to exclude from conduit systems. in a classified area, circuits may be designed with low-energy power sources so that the circuits are not capable of igniting the atmosphere because their available energy is below the level required to ignite the specific materials present. Another alternative involves moving equipment to less hazardous areas or to unclassified areas. Yet another method for reducing the amount of special equipment required is to eliminate or dilute eliminate or dilute
Ventilation and special containment systems may be used to dilute a gas or vapor or to keep it from accumulating. the flammable or combustible mixture so there is nothing to ignite.
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NOTE: This is an unformatted excerpt from our online fire protection training library.

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