This article was posted 10/13/2006 and is most likely outdated.

Article 100 General: Separately Derived Systems
 

 
Subject - Article 100 General: Separately Derived Systems

October 13, 2006  

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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)

       

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Comments
  • Mr. Holt, I was slightly confused about this message. It indicated that a transformer was not a separately derived system and at another point it said it was. I was and have always had the perception that a distribution transformer (typical 480v/208v) represented a separately derived system in the eyes of the code. For clarification, can you provide your interpretation of this? Thanks for all of your great articles and literature - Larry

    Larry Coker
    Reply to this comment

  • Is it safe to assume that an electrical distribution system and generator providing three phase power to a carnival would be considered "a separately derived system"? This has caused a great deal of controversy among regulators when a five wire system is used on a carnival. Perhaps another article specifically dealing with generators, ground rods, splicing, distribution boxes, wiring, etc., beyond the scope of the great Article 525 information that dealt with GFCI and lighting, would be helpful to a number of regulatory inspectors around the country dealing with carnivals.

    Ray Rieger
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