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

Introduction to the NEC


Words with Multiple Meanings

Some words have multiple meanings and are defined differently in different places. An example is the word exposed, although it's primary definition is in Article 100.

As applied to live parts, exposed is defined in Article 100 as a condition where someone could make contact with a live part because it's not guarded or isolated or insulated. An example of this use is in Section 110.26(A)(1).  As applied to wiring methods, the definition of exposed deals with whether wiring is accessible, not whether it can be contacted. An example of this use can be found in Section 334.12(A)(2), where Type NM cable is considered to be exposed if it is installed in dropped or suspended ceilings in a dwelling unit. In other cases, exposed may mean simply that something can be seen, such as in Section 725.24, which addresses cables that might be “exposed on the surface of ceilings or sidewalls.” Another use is to mean “subject to” as in Section 310.10(D), “Locations Exposed to Direct Sunlight.” In Chapter 8, particularly Article 800 on communications methods, exposed is used to describe a circuit that is subject to contact with a higher voltage system that could perhaps induce or introduce a higher than normal energy level (such as a surge current voltage) that could represent a threat to persons or property.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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