This requirement was extracted from NEC 250-51, Effective Grounding Path, which is more complete and fundamental to the understanding of electrical safety. Thats the big question we will answer in our discussion. In electrical engineering, ground or earth is a reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.. Electrical circuits may be connected to ground for several reasons. In the previous analogy, a dam holding back the natural flow of river current is like an insulator, or dielectric. When a fault in the system develops, the closed loop is broken, and the electrical current will look for the easiest way to get to ground. The reverse isn't true if the connected device requires a neutral. If 200 amperes flow from the positive terminal of a battery and operate the starter motor, how many amperes will flow back to the negative terminal of the battery? Not only does your home wiring system have a grounding system for safety, but many plug-in appliances and devices do, too. Bacteria have flourished on the earth for over three billion years. Grounding is the very foundation of a building or structures electrical system. Has the Electrical Grid Changed Since 2003s Northeast Blackout? Appliances and machines become safer because there is less risk of a shock hazard or electrical fire, and downtime is reduced. This is no sure thing, by any means, so three-prong to two-slot adapters should be used with great caution, if at all. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. Solid Copper Wire: Whats the Difference? The conductivity of the EGFCP is critical for protective devices to work properly. The Spruce uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. The National Electrical Code (NEC) does touch on electrical equipment bonding inArticle 250 (A)(1.4), saying: Normally noncurrentcarrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path..
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