Removing the paint, as required in Section 250.12, provides for a better connection and conductivity path. The bare copper grounding wires terminate in a grounding bar in your . The schematic does not provide any clue as to physical connections. Because the metal parts have the same electrical potential, electricity cant flow between them. What Is a Ground Fault? | Hunker Editors of Cool Springs Press. General. The physics of electrical flow are more complicated than most simple explanations can convey, but essentially, electricity seeks to return its electrons to "ground"that is, to discharge its negative energy and return to equilibrium. If points 1 through 4 are not connected to Earth Ground but are connected to a Common Ground, it would be more appropriate to use the symbol IEC 60417 5020. Download our Grounding and Bonding Fact Sheet, information delivery platform with NFPA codes and standards, supplementary content, and visual aids for building, electrical, and life safety professionals and practitioners. Air is an insulator, and the human body is relatively conductive. Through the lead that has been connected to the fire alarm circuit in the building. By creating the effective ground-fault current path youll not only be doing the job correctly, but youll keep yourself and others safe to boot. Solid Copper Wire: Whats the Difference? Grounding allows for safe voltage stabilization in large circuits and systems. Kevin Beck holds a bachelor's degree in physics with minors in math and chemistry from the University of Vermont. As we said earlier, every electrical circuit needs to be complete for the current to flow. Safe Digging: Locating and Marking Underground Utilities. For grounded systems, the NEC requires you to perform all of the following: electrical system grounding, electrical equipment grounding, electrical equipment bonding, and bonding of electrically conductive materials. Section 250.1. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. Why is the earth a viable return path for power distribution? In most cases, the path of least resistance for electricity will run through an electric appliance, whether its a motor, lightbulb, machine, or anything else requiring power to run. Article 100 of the NEC defines bonded (bonding) as connected to establish electrical continuity and conductivity. Bonding metal parts, such as enclosures and raceways, ensures that they are all continuous on an effective ground-fault current path (EGFCP) that references back to ground (earth). Grounding is a term an electrician, electrical engineer, or facility manager is very familiar with and uses frequently, but what does it mean?
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