For the purposes of Art. A surface, flush, or freestanding raceway designed to hold conductors and receptacles (in the field or the factory). Access to Overcurrent Protective Devices | UpCodes But these and similar recommendations are the kinds of best practices that improve the performance, reliability, and safety of a transformer over its lifetime. A duplex receptacle can be supplied by two branch circuits by removing the tab. equipment grounding terminal bus However, receptacles of cord- and plug-connected arc welders may have ampere ratings not less than the minimum branch-circuit conductor ampacity. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). Duplexes control outlets of energy, as well as switches and can be used in conjunction such as a garbage disposal, Enclosed Equipment, conductors, ect. k=13k51. An ____ is the organization, office, or individual responsible for enforcing the requirements of a code. 4. . 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. 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. For dc circuits only, the equipment grounding conductor may be run separately from the circuit conductors. What are Overcurrent Protection Devices? - Technical Articles - EE Power Where the neutral is not grounded on the load side of the circuit, the current transformer may link all three phase conductors and the grounded circuit conductor (neutral); and. Alternatively, you can also use a properly rated safety switch. B. Thus, you do not create a new branch circuit. information technology room.4.b. Service Lateral A. 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A system conductor that is required to be grounded by the provisions of paragraph (g)(2) of this section shall be bonded to the generator frame where the generator is a component of a separately derived system. The main bonding jumper is connection at the service between the grounded circuit conductor and the equipment grounding conductor. A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary. 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. One conductor of a single-phase, two-wire system shall be grounded; The neutral conductor of a single-phase, three-wire system shall be grounded; The common conductor of a multiphase system having one wire common to all phases shall be grounded; One phase conductor of a multiphase system where one phase is grounded shall be grounded; and. In the 2014 NEC, the definition of readily accessible in Article 100 was revised to make it clear that something is not readily accessible if a tool is needed to gain access to it. The overhead conductors between the utility electric supply and the service point. A circuit breaker with a slash rating, such as 120/240 V or 480Y/277 V, may only be installed in a circuit where the nominal voltage of any conductor to ground does not exceed the lower of the two values of the circuit breaker's voltage rating and the nominal voltage between any two conductors does not exceed the higher value of the circuit breaker's voltage rating. IMO 422.11 (E) 3 permits him to do this WITHOUT the fuse. I dont like the 'new definition' of 'Branch circuit overcurrent device'. Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. Grounded Conductor A. The requirement for maintaining a vertical clearance of 914 mm (3.0 ft) from the edge of the roof does not apply to the final conductor span, where the conductors are attached to the side of a building. I would only agree if the fuse were within the premises wiring system. The branch circuit wiring method shall include or provide an equipment grounding conductor to which the grounding contacts of the receptacle or cord connector shall be connected. A grounded conductor is a system or circuit conductor that is intentionally grounded. The neutral point is the common point on a Wye-connection in a polyphase system. overcurrent devices do not have to be readily accessible if Location Wet A. Using bonding bushes on the ends of the raceway, Four 4 AWG copper conductors with THHN insulation installed in EMT in a basement. 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. Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. Damp locations are those subject to moderate degrees of moisture. Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless supported by messenger wires. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. A major concern with transformers is preventing overheating. Nonmetallic-sheathed cable not fastened to the box must be secured within ____ in. If the intended location of the transformer will violate the adequate working space rules, fail to allow for adequate ventilation, or pose some other hazards, do not install the transformer in that location. 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. above the floor or working platform, unless one of the following applies: Branch Circuits. Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. . IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. The conductors are terminated at a through-the-roof raceway or approved support. Where a grounding means does not exist in the receptacle enclosure, the installation shall comply with one of the following provisions: A nongrounding-type receptacle may be replaced with another nongrounding-type receptacle; or. Branch Circuit Multi-wire Multi-wire circuit consists of one (or more) duplex receptacles, one or more multiple receptacles single or combination. Nec Flashcards | Quizlet 240.6(A)]. An AFCI is basically like a GFCI but it will protect the entire circuit from the breaker and back. Electric equipment is considered to be effectively grounded if it is secured to, and in electrical contact with, a metal rack or structure that is provided for its support and the metal rack or structure is grounded by the method specified for the noncurrent-carrying metal parts of fixed equipment in paragraph (g)(8)(i) of this section. Rigid metal conduit (RMC) is a raceway of ____. Thus, the receptacle outlet is the endpoint of the branch circuit, and the breaker in the panel is the circuit's final OCPD. 225.40 Wiring and Protection, Access to Overcurrent Protective Devices. Service A. If I understand the situation correctly (no guarantee of that! Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. NEC 2008 article 100 definitions. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. Stumped by the Code? Overcurrent devices do not have to be readily accessible if located within anded jacobs k. the connecting means is readily accessible the total of the conceitdees of wood local andards Located at the equipmenl where excess is achieved by the we of poetic ANS: PTS: REF: Definitions 3. JavaScript is disabled. 250.12]. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. Listed equipment protected by a system of double insulation, or its equivalent, and distinctively marked as such. According to that same definition, the branch circuit ends at an outlet. 4. Every electric circuit must have overcurrent protection, whether a high-voltage transmission line carries many amperes or a low-voltage lighting circuit passes a few amperes.Some devices must protect conductors and equipment from overloads and short . f(x)=4x+53f(x)=\sqrt{4 x+5}-3 When any element of this branch circuit is replaced, the entire branch circuit shall use an equipment grounding conductor that complies with all other provisions of paragraph (g) of this section. The overcurrent devices shall be readily accessible to the tenants they serve -- at anytime the tenant will be able to access the OCD quickley, without hinderance of locked doors in which they do not have keys -- If the tenant can freely walk to the OCD for access then you are good -- I am also assuming the tenant has permanate provisions for cooking in their unit. What components make up an ADT, exactly? Each service disconnecting means shall simultaneously disconnect all ungrounded conductors. . Essentially, this Article covers transformers supplying power and lighting loads. FLAC NEC Whi MULTIPLE CHOICE 1 Wiring components are - Chegg ampacity = Overcurrent devices do not have to be readily accessible if ____. A heavy-duty lampholder shall have a rating of not less than 660 watts if of the admedium type and not less than 750 watts if of any other type; and. 19. You are right, and the other guy is wrong. The NEC.arose as a consensus of more than 1200 individuals primarily to omhat wing spidemic of electrical fires standardize equipment d.standardie price schedules REF: ANS: PTS: Electrical Code The National 7. When any element of this branch circuit is replaced, the entire branch circuit shall use an equipment grounding conductor that complies with all other provisions of paragraph (g) of this section. Illustrated Guide to the National Electrical Unit 2 test - Quizlet Mark the new location the same way the old location was marked; if the old location was not marked, clearly mark the new location using a permanent and acceptable means. neutral ground strap Overcurrent devices do not have to be readily accessible if located within anded jacobs k. the connecting means is readily accessible the total of the conceitdees of wood local andards Located at the equipmenl where excess is achieved by the we of poetic ANS: PTS: REF: Definitions 3. PDF Equipment Protection - Eaton Outlet A point in a wiring system from which current is taken to supply utilization equipment is known as an outlet. Notice the language is accessible to qualified personnel. This in no way inhibits making transformers inaccessible to unqualified personnel. The terminals are rated 75C (Fig. Cables running horizontally (or diagonally) are considered supported and secured when passing through a(n) ____. See 210. Reference 422.11(A). Branch Circuit The circuit conductors found between a circuits final overcurrent protective device (breaker) and the circuits outlet is called a branch circuit. Over areas, other than public streets, alleys, roads, and driveways, subject to vehicular traffic other than truck traffic. Main Equipment B. Conductive Path C. Grounded Neutral D. Bonding Jumper E. Bonding Conductor F. Grounding Electrode Conductor G. Grounding Electrode: The path installed with all the parts of the path A G. Guarded is defined as covered, shielded, fenced, enclosed, or otherwise protected by barriers, rails, screens, mats, or a platform removing the approach of contact by people or persons. - Maximum Cord- and Plug-Connected Load to Receptacle, Table S-5. overcurrent devices do not have to be readily accessible if. 2). Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in Table S-5; or, where larger than 50 amperes, the receptacle rating may not be less than the branch-circuit rating. 1910.304 - Occupational Safety and Health Administration The definition of that word begins with, "A point on the premises wiring system. The performance are generally affected by the factors like lag in the compensating devices, slow response of the sys. Check The Knowledge False Not readily accessible means you dont have to worry about it at all or ever have to service it? Meaning that if you had to get a ladder to reset this breaker, its considered accessible equipment as long as its not blocked. 5. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. An intersystem bonding termination will typically be used as a ground junction for a/anA. Holes must be bored so that the edge of the hole is at least ____. If the system is a high-impedance grounded neutral system in which a grounding impedance, usually a resistor, limits the ground-fault current to a low value for 3-phase ac systems of 480 volts to 1000 volts provided all of the following conditions are met: Ground detectors are installed on the system; and. Electrical Engineering questions and answers, 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. Formal interpretations of the NEC are govered by regional construction authorities. National Electrical Code Basics: Overcurrent Protection Part 5 (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). That bonding is to be done per Table 250.122. What might block airflow? 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. Related Code Sections. Handles or levers of circuit breakers, and similar parts that may move suddenly in such a way that persons in the vicinity are likely to be injured by being struck by them, shall be guarded or isolated. A lamp holder itself is not a luminaire. Communications conductors alone -- no requirement. white, gray, green, or, green with yellow stripe(s). A feeder consists of all circuit conductors located between the service equipment, the source of a separately derived system, or other power supply source and the final branchcircuit overcurrent device. Transformers having a secondary voltage not exceeding 1,000V, with primary overcurrent protection only, must have the primary overcurrent protective device sized per the percentages shown in Table 450.3(B) and the percentages mentioned in its applicable notes [Sec. For a grounded system, a grounding electrode conductor shall be used to connect both the equipment grounding conductor and the grounded circuit conductor to the grounding electrode. NEC Requirements for Conductor Material Types and Sizing Requirements, Electrical Troubleshooting Quiz July 19, 2022, NEC Requirements for Overvoltage Protection, EC&M Tech Talk Video Medium-Voltage Conductors and Cable, Monthly Quiz: Grounding and Bonding Connections. Over residential property and driveways. Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. Selective coordination Occupational Safety & Health Administration. Primary Conductor = 6 AWG conductor rated 65A at 75C [Sec. B. According to the definition of a branch circuit, it starts at the final overcurrent protection device. Festoon Lighting A. Festoon lighting is a string of outdoor lights suspended between two points. This type of protection is not required to be readily accessible as are branch circuit devices. Service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a clearance of not less than 914 mm (3.0 ft) from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, and similar locations. 240.4(B). Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Verified Answer for the question: [Solved] Overcurrent devices do not have to be readily accessible if ____. The full form of the acronym, MCCB, is Miniature Case. Different customers power, A: AWG or American Wire Gauge is the US standard measure for the diameter of electrical conductors. Exterior protected locations under canopies, roofs, porches, and similar sites are considered damp locations. Metal enclosures for conductors added to existing installations of open wire, knob-and-tube wiring, and nonmetallic-sheathed cable need not be grounded if all of the following conditions are met: Runs are less than 7.62 meters (25.0 ft); Enclosures are free from probable contact with ground, grounded metal, metal laths, or other conductive materials; and. A(n) ____ is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical, in nature. Attachment Plug An attachment plug (plug cap) is a device that, when inserted into a receptacle establishes a connection between the conductors of a cord and the receptacle. Nonmetallic-sheathed cable passing through holes in metal framing must be protected by ____ covering all metal edges. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. 5. A receptacle outlet shall be installed wherever flexible cords with attachment plugs are used. Over commercial areas subject to truck traffic. Grounding-type receptacles shall be installed only on circuits of the voltage class and current for which they are rated, except as provided in Table S-4 and Table S-5. Start with "Branch Circuit," not with "Branch Circuit Overprotection Device.". 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.
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