9.2. The enclosure that the panelboard is mounted inside of is called a cabinet by the NEC and is covered by Art. A switchboard or multiple individually mounted circuit breakers must be at the same physical location as the service entrance to shut off … As well, the scope of the article in Section 408.1 has been changed to align with the revision. 1096 Hits. The terminology is used more in North America than in Europe. NEC … One of the key revisions was a definition of “Reconditioned” which is now defined in Article 100 as “Electromechanical systems, equipment, apparatus, or components that are restored to operating conditions. If you use nonmetallic raceway, it must be encased in at least 2 in. These are flat strips of copper or aluminum, to which the switchgear is connected. You can help Wikipedia by expanding it. Total Cards. The role of a switchboard is to allow the division of the current supplied to the switchboard into smaller currents for further distribution and to provide switching, current protection and (possibly) metering for those various currents. permitted in a factory built switchboard meeting UL stan-dards provided the appropriate barriers are in place. The U.S. National Electrical Code (NEC) defines a switchboard as "a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, over-current and other protective devices, buses, and usually instruments". These two sections are sometimes replaced by a combination section, which is a section that can fulfill the roles of both aforementioned sections. Busbars carry large currents through the switchboard, and are supported by insulators. There may also be controls for the supply of electricity to the switchboard, coming from a generator or bank of electrical generators, especially frequency control of AC power and load sharing controls, plus gauges showing frequency and perhaps a synchroscope. Introductioin to the National Electrical Code. Informational Note: All switchgear subject to NEC requirements is metal enclosed. The metal enclosure of the switchboard is bonded to earth ground for protection of personnel. NEC allows a maximum of six hand movements at one location to shut off all the power of a building with a large power-distribution system. Inside a switchboard there will be one or more busbars. When the Code refers to a panelboard, it is referring to the interior or "guts" of the panelboard. UL Standard | UL 891 | Edition 12 | Standard for Switchboards | Edition Date: July 19, 2019 | ANSI Approved: July 19, 2019 310. A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box placed in or against a wall, partition, or other support; and accessible only from the front. Scope: The terms and definitions in the standard are intended to encompass the products within the scope of the C37 project that include power switchgear for switching, interrupting, metering, protection, and regulating purposes as used primarily in connection with generation, transmission, distribution, and conversion of electric power. This seemingly simplistic definition becomes increasingly convoluted as the designer begins to examine the overall circuit-protection scheme on their new project and how it relates to the NFPA 70: National Electrical Code (NEC). A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. However, this is only permitted under specific conditions as contained in 240.21. Switchboards are generally accessible from the rear as well as • NEC® Article 100 Definition • The highest current EQUIPMENT can withstand without extensive damage (fire or shock hazard). Switchboards, Switchgear, and Panelboards. In the 2011 NEC, Article 408 provided the rules on switchboards and panelboards, nothing else. Switchboard. Switchboard Definition Definition The National Electrical Code® (NEC®) defines a switchboard as a large single panel, frame, or assembly of panels on which are mounted, on the face or back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. It is generally accessible from the rear as well as from the front. Modern industrial switchboards are metal enclosed and of "dead front" construction; no energized parts are accessible when the covers and panels are closed. While switchboards and power panelboards perform similar Switchgear rated below 1000 V or less may be identified as “low-voltage power circuit breaker switchgear.” Switchgear rated over 1000 V may be identified as “metal-enclosed switchgear” or “metal-clad switchgear.” Switchgear is available in non–arc-resistant or arc-resistant constructions. Mike Holt Enterprises • www.MikeHolt.com • 888.NEC.CODE (632.2633) 27 ARTICLE 110 110.3 Examination, Identification, Installation, Use, and Listing of Equipment 9.3. It is NOT permitted to contain control or auxiliary devices. The 2020 edition of the NEC will likely include a new definition to help clear up this confusion. Article 100 has the following definitions that support the equipment covered in Article 408: Panelboard. 38. The U.S. National Electrical Code (NEC) defines a switchboard as "a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, over-current and other protective devices, buses, and usually instruments". Switchboard Definition The National Electrical Code® (NEC®) defines a switchboard as a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, overcurrent and other protection devices, buses, and usually instruments. These assemblies are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets . The operator is protected from electrocution by safety switches and fuses. Switchboards are defined in the NEC as “A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent, and other protective devices, buses, and usually instruments. 9.3.1. A switchboard is divided into different interconnected sections, generally consisting of a main section and a distribution section. Wednesday, 11 March 2020. Previously, open switchboards were made with switches and other devices were mounted on panels made of slate, granite, or ebony asbestos board. The 2017 NEC added a definition for “stand-alone (islanded) mode” and a related Article 710: stand-alone systems. The company was known as the Nippon Electric Company, Limited, before rebranding in 1983 as NEC. The National Electrical Code (NEC) defines the switchboards as a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both – switches, overcurrent and other protective devices, buses and other instruments. deadfront switchboards and the applicable codes and standards in order to facilitate a reasonably safe and code-compliant installation of switchboards used in ordinary locations, rated 600 volts or less. Adheres to all Main Service Switchboard guidelines. A switchboard may have incoming bus bars or bus duct for the source connection, and also for large circuits fed from the board. Definition. An assembly completely enclosed on all sides and top with sheet metal (except for ventilating openings and inspection windows) and containing primary power circuit switching, interrupting devices, or both, with buses and connections. It is an assembly of one or more panels, each of which contains switches that allow electricity to be redirected. In general, switchboards may distribute power to transformers, panelboards, control equipment, and, ultimately, to individual system loads. Switchboards are built and tested according to: Switchgear. U.S. National Electrical Code NEC Reference (2): Requirement for main circuit breaker if more than six switches in the panel: See NEC Section 230-71. Article 404 of the NEC applies to switches of all types, although the Code doesn’t include a specific definition for a switch. • Requires the equipment to have a short circuit current The NEC does permit conductors that are identified as “tap conductors” to have overcurrent protection set at a value that greatly exceeds the ampacity of the conductors. Access to the interior of the enclosure is provided by doors, removable covers, or both. A switchboard may include a metering or control compartment separated from the power distribution conductors. As per the definition, a panelboard is installed in a cabinet or cutout box, correct? Article 225: A readily accessible disconnect is required at the remote building, located either outside or nearest the point of entrance inside [225-8]. S witchboards are typically down stream of switchgears, at lower voltages, generally equal or less than 600 V, and they are used to distribute power to multiple sources and transmitting it to individual loads, panel boards and control equipment.. The original definition was not entirely clear in the context of another new Article 705: interconnected electric power production sources. The assembly may include control and auxiliary devices. [1] Switchboards can also sometimes come with an auxiliary section that is used to house devices that cannot be housed in the same section as other devices.[2]. of concrete [520.5(A)], unless it's … NEC Corporation (日本電気株式会社, Nippon Denki Kabushiki-gaisha) is a Japanese multinational information technology and electronics company, headquartered in Minato, Tokyo. The NECs definition of readily accessible states: capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to actions such as to use tools, to climb over or remove obstacles, or to resort to portable ladders and so forth. Located between the utility transformer secondary and the Main Service Switchboard. "NEMA Standards Publication 2-2011 Deadfront Distribution Switchboards," Rosslyn, VA: National Electrical Manufacturers Association, 2011. https://www.nema.org/Standards/Pages/Deadfront-Distribution-Switchboards.aspx, "Incoming Auxiliary Section | LVPD Switchboards by Schneider Electric", "Electrical Standard; Final Rule | Occupational Safety and Health Administration", https://en.wikipedia.org/w/index.php?title=Electric_switchboard&oldid=988042546, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 November 2020, at 18:29. Level. Bare busbars are common, but many types are now manufactured with an insulating cover on the bars, leaving only connection points exposed. Typical service switchgear about to have the utility service entrance conductors terminated by the lineman. Large switchboards may be free-standing floor-mounted enclosures with provision for incoming connections at either the top or bottom of the enclosure. The amount of power going into a switchboard must always be substantially equal to the power going out to the loads ( less the losses in internal conductors and consumption by internal devices such as pilot lamps, space heaters, or others). The remainder of this paper will further discuss these concepts in relation to NEC requirements. Created. Which of the following is true of switchgear? I believe the updates will make it easier for installers, designers and inspectors to ensure this electrical equipment … Definition The National Electrical Code® (NEC®) defines a switchboard as a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, overcurrent and other protection devices, buses, and usually instruments. ... Where in the NEC would you find information on switchboards and panelboards? An electric switchboard is a device that directs electricity from one or more sources of supply to several smaller regions of usage. Switchboard. During the 2020 NEC development process multiple revisions to the NEC were approved to address the aforementioned issues. Professional. This past summer, National Electrical Code (NEC) and National Fire Protection Association (NFPA) committee members updated fault current definitions and added new requirements related to switchboards, switchgear and panelboards in NEC Article 408. In general, switchboards may distribute p… NEC Article 408: ... Definitions are covered in: Definition. To have maintenance mode where indicated by the Arc Flash study or as required by 2017 NEC 240.67 and 240.87. sign in for electrical continuing education courses. NEC Code 240: Circuit Breakers (Overcurrent Protection) Quiz NEC Code 250: Grounding and Bonding Quiz Questions NEC Code 680: Swimming Pools, SPAs, Hot Tubs Installations Quiz Questions Switchboards. Pre-wired assemblies are becoming much more common in elec-trical construction, especially where space is a concern. The NEC includes many references to "switching devices," which can be defined as any devices that open and close electrical circuits. The underlined text is new for the 2014 NEC but not new for anyone working on or installing electrical equipment, because the requirement for no to… Enclosed Devices As this definition indicates, switchboards enclose various devices. Subject. However, six types of switches are defined in … These switchboards are intended to be installed in accordance with the National Electrical Code® (NEC ®) and their listing. This technology-related article is a stub. • May be based on a specific type of overcurrent device • NEC® 110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics. Switchboard. Panelboard puzzler I recently came across equipment that looked like a switchboard, but it contained transformers and panelboards. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code). Without an effective circuit-protection scheme, a building’s electrical system is prone to myriad failures. It contains instruments and is not permitted to contain inspection windows. Tap conductor definition from 240.2 of the National Electrical Code (NEC), 2014 edition ... from the tap to the enclosure of an enclosed switchboard, switchgear, a panelboard, or control devices, or to the back Article 408 covers the requirements for switchboards and panelboards. In the 2014 NEC, Article 408 now applies to switchboards, switchgear, and panelboards. These assemblies are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets. A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Other. [3] The role of a switchboard is to allow the division of the current supplied to the switchboard into smaller currents for further distribution and to provide switching, current protection and (possibly) metering for those various currents. This past summer, National Electrical Code (NEC) and National Fire Protection Association (NFPA) committee members updated fault current definitions and added new requirements related to switchboards, switchgear and panelboards in NEC Article 408. Code Change Summary: Article 408 now applies to more than just switchboards and panelboards. 5. Is that a panelboard? Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets. See the actual NEC text at NFPA.ORG for the complete code section. A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Below is a preview of the NEC. The NEC (National Electrical Code)—an official document used in the electrical industry and revised every three years—provides the technical definitions of various terms commonly used in electrical work. 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