Article 100

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General Separately Derived System The definition for a “separately derived system” was revised by eliminating the list of electric energy power sources that constitute a separately derived system. Actually, the original proposal was to add “fuel cells” to the list. With the list removed, there’s no need to keep updating the list of new power sources. In addition, the definition was revised to clarify that a separately derived system could be supplied from “other than a source of electric energy.” For example, a photovoltaic system is a source of electric energy, but a transformer is not a source, it’s the equipment that provides the power. Small point, but you know every point counts! Separately Derived System. A wiring system whose power is derived from a source of electric energy or equipment other than the electric utility service. Such systems have no direct electrical connection, including a solidly connected grounded circuit conductor, to supply conductors originating in another system. Figure 100-10 Author’s Comment: This includes a battery, a solar photovoltaic system, a transformer, or a converter winding, where there’s no direct electrical connection to the supply conductors of another system.

Figure 100-10 (Click on image to enlarge)