The article 100 definition of a branch circuit ends at an outlet. Selective coordination All 3-wire dc systems shall have their neutral conductor grounded; Two-wire dc systems operating at over 50 volts through 300 volts between conductors shall be grounded unless: They supply only industrial equipment in limited areas and are equipped with a ground detector; They are rectifier-derived from an ac system complying with paragraphs (g)(1)(iii), (g)(1)(iv), and (g)(1)(v) of this section; or. Metal enclosures for service equipment shall be grounded. Verified questions. Overhead service conductors may not be installed beneath openings through which materials may be moved, such as openings in farm and commercial buildings, and may not be installed where they will obstruct entrance to these building openings. The main bonding jumper is connection at the service between the grounded circuit conductor and the equipment grounding conductor. B. A neutral conductor is defined as the conductor connected to the ____ that is intended to carry current under normal conditions. 240.6(A)]. Festoon Lighting C. Messenger wire(s), together with insulators is used to support conductors in all span exceeding 40 ft (12 m) in length. "I have learned, in whatsoever STATE I am, therewi, http://www.usahardware.com/inet/shop/item/30550/icn/20-068163/bussman/bp_sru.htm. I dont like the 'new definition' of 'Branch circuit overcurrent device'. Branch Circuit General Purpose A general purpose branch circuit supplies two or more receptacles or outlets for lighting and appliances. A: The solution is provided in the following section: A: Cable Tester- Related Code Sections. There a multi-wire circuit must consists of two or more ungrounded (hot) conductors that have a voltage between them. Nonmetallic-sheathed cable not fastened to the box must be secured within ____ in. service disconnect | Mike Holt's Forum Above finished grade or sidewalks, or from any platform or projection from which they might be reached. Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and metal outlet or junction boxes that are part of the circuit for these appliances shall be grounded. What might block airflow? Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. A. Which agency is responsible for the maintenance and publication of the NEC ? Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. On extensions of existing branch circuits that do not have an equipment grounding conductor, grounding-type receptacles may be grounded to a grounded cold water pipe near the equipment if the extension was installed before August 13, 2007. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. Note 1 of Table 450.3(B) says that if 125% of the primary current does not correspond to a standard rating of an overcurrent protective device [Sec. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 150 V.). Over public streets, alleys, roads, and driveways. They are fire-alarm circuits having a maximum current of 0.030 amperes; AC circuits of less than 50 volts shall be grounded if they are installed as overhead conductors outside of buildings or if they are supplied by transformers and the transformer primary supply system is ungrounded or exceeds 150 volts to ground; AC systems of 50 volts to 1000 volts shall be grounded under any of the following conditions, unless exempted by paragraph (g)(1)(v) of this section: If the system can be so grounded that the maximum voltage to ground on the ungrounded conductors does not exceed 150 volts; If the system is nominally rated three-phase, four-wire wye connected in which the neutral is used as a circuit conductor; If the system is nominally rated three-phase, four-wire delta connected in which the midpoint of one phase is used as a circuit conductor; or. The terminals are rated 75C (Fig. Branch Circuits. All 125-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets that are not part of the permanent wiring of the building or structure and that are in use by personnel shall have ground-fault circuit-interrupter protection for personnel. Dont install a transformer below a water heater that is on a mezzanine or similar elevation. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). Damp locations are those subject to moderate degrees of moisture. My view is that anything that gets plugged into a receptacle outlet is not part of the premises wiring system. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. A violinist places her finger so that the vibrating section of a 1.0 g/m string has a length of 30 cm, then she draws her bow across it. overcurrent devices do not have to be readily accessible if. Communications conductors alone -- no requirement. Branch Circuit Appliance An appliance branch circuit supplies energy to one or more outlets for the purpose of connecting appliances. Receptacles other than 125 volt, single-phase, 15-, 20-, and 30-ampere receptacles that are not part of the permanent wiring of the building or structure and that are in use by personnel shall have ground-fault circuit-interrupter protection for personnel. Primary Overcurrent Protection = 54A 125% = 68A; use the next size up, 70A [Sec. Dry locations are those not normally subject to moisture except on a temporary basis such as a building under Construction NEC. Exposed runs of Type AC cable installed on the underside of joists must be supported at ____. Patient equipment grounding point is used ,to the eliminate the electromagnetic, The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. Receptacles and cord connectors having grounding contacts shall have those contacts effectively grounded except for receptacles mounted on portable and vehicle-mounted generators in accordance with paragraph (g)(3) of this section and replacement receptacles installed in accordance with paragraph (b)(2)(iv) of this section. overcurrent devices do not have to be readily accessible if Access to Overcurrent Protective Devices | UpCodes "must" or "must note penalties for noncompliance" b. shall" or "shall not suggested but discretionary ANS: PTS: Electrical Code REF: The National 10. In Sight A. NEC defines in sight from, within, or within sight to the applied equipment and indicates that specified items or equipment is visible and not more than 50 Ft. apart. B. A reduction in clearance to 914 mm (3.0 ft) is permitted where the voltage between conductors does not exceed 300 and the roof has a slope of 102 mm (4 in.) Feeder and branch-circuit conductors shall have overcurrent protection in each ungrounded conductor located at the point where the conductor receives its supply or at a location in the circuit determined under engineering supervision; Circuit breakers used for overcurrent protection of three-phase circuits shall have a minimum of three overcurrent relays operated from three current transformers. "Readily accessible" means located so a person can reach it quickly without having to climb over (or remove) obstacles, or use a portable ladder. 100]. False. That plug-in breaker thing is a piece of utilization equipment. If a delta-connected high voltage system is used to supply the equipment, a system neutral shall be derived. 100 iops/gb and 100,000 iops per volume oci, Article xi of the code of ethics for professional teacher, The problem of concept drift: definitions and related work, Comparison between micro teaching and traditional teaching, Match the following terms with their definitions communism, Nursing definition by florence nightingale, What is the definition of compare and contrast, Cscmp supply chain management definitions and glossary, Contents Article 1 Article 2 Article 3 Article, Definitions Verbs Adjectives Nouns Genre 100 100 100, Measurement Scientific Definitions Method Graphing 100 100 100, Definitions Adjectives Conjunctions or Interjections 100 100 100, Definitive Article Definite article The The definite article, Contrat Article 60 7 Contrat Article 61 Article, On The Constitution Article 1 Article 2 Article, article definite article indefinite article anaphoric anaphoricity judgement, Definite Article Definite article The The definite article, Modifiers Article Personal Pronoun Article Possessive Pronoun Article, XML article idhw titleHellotitle paraHello objectWorldobjectpara article article, ARTICLE 8 Civil Code of the Philippines Article, 2020 Electrical Advisory Board Article 100 and 200, ORAL PATHOLOGY DEFINITIONS PATHOLOGY DEFINITIONS PATHOLOGY DIAGNOSIS DEFINITIONS, Genetic Definitions Karyotype Genetic Definitions Genetic Definitions Genetic, Electrical Safety Basic Electrical Safety Electrical Course not, Electrical Charge Electrical Force and Electric Fields Electrical, Electrical Technology What is Electrical Technology n Electrical, Electrical Circuits Electrical Circuits l Electrical circuits will. Tenant access to panel | Mike Holt's Forum However, receptacles of cord- and plug-connected arc welders may have ampere ratings not less than the minimum branch-circuit conductor ampacity. 18. A(n) ____ is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical, in nature. Exception: Overcurrent devices don not have to be readily accessible if located adjacent to the equipment where access is achieved by the use of portable means. Common Overcurrent Protection Devices (OCPDs) An overcurrent protection device (OCPD) is a piece of electrical equipment used to protect service, feeder, and branch circuits and equipment from excess current by interrupting the flow of current. Over areas, other than public streets, alleys, roads, and driveways, subject to vehicular traffic other than truck traffic. Oddly enough, you will find the underlying concept in NFPA 70E, Standard for Electrical Safety in the Workplace. Over public streets, alleys, roads, and driveways. Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. Volume in boxes can be increased by using ____ rings, domed covers, extension rings, or similar items. Part I contains the general requirements (such as guarding, marking, and accessibility), and Part II contains requirements for specific types of transformers. An appliance branch circuit supplies energy to one or more outlets for the purpose of ____. Branch Circuit The circuit conductors found between a circuits final overcurrent protective device (breaker) and the circuits outlet is called a branch circuit. FLAC NEC Whi MULTIPLE CHOICE 1 Wiring components are considered accessible if(t) access can be gained without damaging the structure or finish of the building or if (2) they are ae Sledstry of the wiring here salatile in the ANS: PTS: 1 REF: Definitions 2. We will hit the highlights here, the first being that the overcurrent devices have to be readily accessible and shall be installed so that the center of the grip of the operating handle is not more than 6 feet 7 inches in its highest position from the floor or working platform. Grounding triad True I would only agree if the fuse were within the premises wiring system. Never set two transformers with their vents facing each other. Installations built before August 13, 2007, Installations built on or after August 13, 2007, Circuit breakers used as switches in 120-volt and 277-volt, fluorescent lighting circuits shall be listed and marked "SWD. A receptacle outlet shall be installed wherever flexible cords with attachment plugs are used. The. The definition for intermediate metal conduit (IMC) and rigid metal conduit (RMC) is ____. Broken connectors in a cable linkB. k=13k51. As long as you can remove the trim and access the junction box it will be considered readily accessible! Home > 2022 > June > 10 > Uncategorized > overcurrent devices do not have to be readily accessible if. You are right, and the other guy is wrong. Cables running horizontally (or diagonally) are considered supported and secured when passing through a(n) ____. Branch Circuit Multi-wire D. Although the box contains a multi-wire branch circuit, only one ungrounded (hot) conductor is feeding this duplex receptacle. Cable installed under a building must be ____ unless the wiring method is Type MC or Type MI cable that is identified for direct burial. Using bonding bushes on the ends of the raceway, Four 4 AWG copper conductors with THHN insulation installed in EMT in a basement. Based on the 2020 NEC. A reduction in clearance above only the overhanging portion of the roof to not less than 457 mm (18 in.) Receptacles connected to circuits having different voltages, frequencies, or types of current (ac or dc) on the same premises shall be of such design that the attachment plugs used on these circuits are not interchangeable. Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. Stumped by the Code? LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. A duplex receptacle can be supplied by two branch circuits by removing the tab. On three-phase, three-wire circuits, an overcurrent relay in the residual circuit of the current transformers may replace one of the phase relays. Main panel, Branch Circuit Multi-wire E. There must be only one grounded neutral conductor, and there must be an equal voltage between it and each undergrounded conductor of the circuit. Select one: four-wire, single-phase. If someone props the door open (for example, because the room is hot and they need to work in there), and the inswing door blocks the vent of a transformer, that transformer is more likely to overheat. Plenum (Space) B. Grounded (grounding) is defined as being connected to ground or to a conductive body that extends to the a ground connection. is permitted where the voltage between conductors does not exceed 300 if: The conductors do not pass above the roof overhang for a distance of more than 1.83 m (6.0 ft), 1.22 m (4.0 ft) horizontally, and. When asked about his responsibility to perform as thorough an investigation as possible, Miller insists that his approach is as per his inspection agreement and his SOP. Much of what weve discussed here isnt explicitly required by the NEC. The switch is, A: Given, The grounding electrode to which the portable equipment system neutral impedance is connected shall be isolated from and separated in the ground by at least 6.1 m (20.0 ft) from any other system or equipment grounding electrode, and there shall be no direct connection between the grounding electrodes, such as buried pipe, fence, and so forth. Overcurrent devices do not have to be readily accessible if ____. Notwithstanding the provisions of paragraph (g)(6)(iv) of this section, exposed noncurrent-carrying metal parts of the following types of fixed equipment need not be grounded: Enclosures for switches or circuit breakers used for other than service equipment and accessible to qualified persons only; Electrically heated appliances that are permanently and effectively insulated from ground; Distribution apparatus, such as transformer and capacitor cases, mounted on wooden poles, at a height exceeding 2.44 m (8.0 ft) above ground or grade level; and. Article 90 explains that the NEC is not a design manual, and it assumes that anyone using the Code has a certain level of expertise. #10. steve66 said: According to the definition of a branch circuit, it starts at the final overcurrent protection device. Holes must be bored so that the edge of the hole is at least ____. Article 230: Services Part 1 | EC&M A: Article 406 of NEC covers the installation of receptacles of both grounded type and non-grounded, A: According to the question we need to Identify and Identify and describe the step-by-step process, A: All components of a photovoltaic system other than the solar panels are included in the balance of, A: Fiber optics is a technology that is connected with the transmission of information as light rays, A: Please find your answer below in step 2, A: Bartleby has policy to solve only first question and if it has subparts then solve only first 3, A: Pin encasings become excessively cumbersome an uneconomical past 33 kV.