A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary. just for the sake of argument, if this guy puts an inline fuse at a 'j box'(its above the ceiling) that is just before the receptacle outlet, then is the point from the j box to the out let of the receptacle the 'branch circuit'?? Vertical clearance of final spans above, or within 914 mm (3.0 ft) measured horizontally of, platforms, projections, or surfaces from which they might be reached shall be maintained in accordance with paragraph (c)(2) of this section. To catch up on Lorenzo Mari's series on Overcurrent Protection, please visit: National Electrical Code Basics: Overcurrent Protection Part 1 . I dont like the 'new definition' of 'Branch circuit overcurrent device'. Find the inverse of the function with the domain given. Ensure the room is vented either via door vents that cannot be blocked or (preferably) an exhaust vent to the outside. A grounded conductor is a system or circuit conductor that is intentionally grounded. 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. Proper transformer selection is an important part of preventing transformers from overheating. You will have to check the listing of the fuse and fuse holder. Post author: Post published: June 10, 2022; Post category: printable afl fixture 2022; 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. Service Drop A. Receptacle outlets shall comply with the following provisions: A single receptacle installed on an individual branch circuit shall have an ampere rating of not less than that of the branch circuit; Where connected to a branch circuit supplying two or more receptacles or outlets, a receptacle may not supply a total cord- and plug-connected load in excess of the maximum specified in Table S-4; and. Note: Please do not handwritten. Ground-fault detection and relaying shall be provided to automatically deenergize any high voltage system component that has developed a ground fault. Evaluate the indefinite integrals in this exercise by using the given substitution to reduce the integral to standard form. Power conductors below communication conductors -- 762 mm (30 in. The maximum number of conductors applies only if the box does not contain any ____. But you can reduce or eliminate power quality problems by correcting grounding and bonding errors at the transformer or somewhere else (e.g., at the utilization equipment). 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. 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. An intersystem bonding termination will typically be used as a ground junction for a/anA. But these and similar recommendations are the kinds of best practices that improve the performance, reliability, and safety of a transformer over its lifetime. Overcurrent devices shall be readily accessible, except for busways (368.17(C)), supplementary overcurrent protection (240.10), overcurrent devices per 225.40 and 230.92, and overcurrent devices located adjacent to the equipment they feed if accessible by portable means - e.g., a ladder. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). Overcurrent devices do not have to be readily accessible if ____. For fire pumps, conductors may be protected for short circuit only; and. What else can you see that might impinge upon a safe and reliable installation? 450.9]. 5. Bonding Connected to establish electrical continuity and conductivity. Prior to the 2017 NEC, "overcurrent devices" were required to be readily accessible. This rule does not prohibit the locking of panel doors or the placing of a padlock on a circuit breaker to restrict access [110.26]. Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. Open conductors, open multiconductor cables, and service-drop conductors of not over 600 volts, nominal, shall conform to the minimum clearances specified in Table S-6. Thus, you do not create a new branch circuit. A load having the maximum level of current sustained for three hours or more is referred to as a ____ load. 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. There are a wide variety of supplementary fuses and fuse holders, which have small physical dimensions . . If fuses are used for overcurrent protection, a fuse shall be connected in series with each ungrounded conductor; Each protective device shall be capable of detecting and interrupting all values of current that can occur at its location in excess of its trip setting or melting point; The operating time of the protective device, the available short-circuit current, and the conductor used shall be coordinated to prevent damaging or dangerous temperatures in conductors or conductor insulation under short-circuit conditions; and. The frame of a vehicle need not be grounded and may serve as the grounding electrode for a system supplied by a generator located on the vehicle under the following conditions: The frame of the generator is bonded to the vehicle frame; The generator supplies only equipment located on the vehicle and cord- and plug-connected equipment through receptacles mounted on the vehicle; The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame; and. This type of protection is not required to be readily accessible as are branch circuit devices. Exposed noncurrent-carrying metal parts of cord- and plug-connected equipment that may become energized shall be grounded under any of the following conditions: If in hazardous (classified) locations (see 1910.307); If operated at over 150 volts to ground, except for guarded motors and metal frames of electrically heated appliances if the appliance frames are permanently and effectively insulated from ground; If the equipment is of the following types: Refrigerators, freezers, and air conditioners; Clothes-washing, clothes-drying, and dishwashing machines, sump pumps, and electric aquarium equipment; Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools; Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers; Cord- and plug-connected appliances used in damp or wet locations, or by employees standing on the ground or on metal floors or working inside of metal tanks or boilers; Portable and mobile X-ray and associated equipment; Tools likely to be used in wet and conductive locations; and. A disconnecting means shall be provided on the supply side of all fuses in circuits over 150 volts to ground and cartridge fuses in circuits of any voltage where accessible to other than qualified persons so that each individual circuit containing fuses can be independently disconnected from the source of power. , Enclosure Any case, housing, apparatus, fence, or wall surrounding an installation designed to prevent personnel from accidentally contacting energized parts to protect the equipment from physical damage serves as an enclosure. A (n) ______ is a complete lighting unit consisting of a light. three-wire, three-phaseD. 240.6(A)]. The frame of a portable generator need not be grounded and may serve as the grounding electrode for a system supplied by the generator under the following conditions: The generator supplies only equipment mounted on the generator or cord- and plug-connected equipment through receptacles mounted on the generator, or both; and. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. Using bonding bushes on the ends of the raceway, Four 4 AWG copper conductors with THHN insulation installed in EMT in a basement. National Firefighters Association (NFA) Underwriter's Laboratory (UL) National Fire Protection Association (NFPA) 1 ANS: PTS: Electrical Code REF: The National 9. A(n) ____ is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical, in nature. A luminaire that weighs more than ____ pounds shall be supported independently of the outlet box, unless the outlet box is listed and marked for the maximum weight to be supported. 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. Exposed noncurrent-carrying metal parts of portable and mobile equipment shall be connected by an equipment grounding conductor to the point at which the system neutral impedance is grounded. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). Above finished grade or sidewalks, or from any platform or projection from which they might be reached. The GFCI shall be readily accessible, listed, and located in one or more of the following locations: (1) Within the branch circuit overcurrent device (2) A device or outlet within the supply circuit (3) An integral part of the attachment plug (4) Within the supply cord not more than 300 mm (12 in.) Readily Accessible | Mike Holt's Forum 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. 2023 Endeavor Business Media, LLC. The weight supported by any single conduit shall not exceed ____ pounds. . Selective coordination in 305 mm (12 in.) All rights reserved. A. Is this in a room with an inswing door? Notice the bonding jumper must be made of copper or other corrosion-resistant material. Code Change Summary: Revised code language on the accessibility requirements for overcurrent devices. Dry-type transformers having a secondary voltage of 1,000V or less are not required to be readily accessible. Between the three-phase line and the disconnect switch. Make a written request to the facility manager to affix a sign to the door, and hang another sign inside the room stating its not a storage area. 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. - Maximum Cord- and Plug-Connected Load to Receptacle, Table S-5. ." Where circuit breaker handles on switchboards are operated vertically rather than horizontally or rotationally, the up position of the handle shall be the closed (on) position. Installing a main bonding jumperB. The in-line fuse holder is not an outlet, because it is not part of the premises wiring system. Branch Circuits A. The neutral conductor of a multiphase system in which one phase is used as a neutral conductor shall be grounded. 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. Part I contains the general requirements (such as guarding, marking, and accessibility), and Part II contains requirements for specific types of transformers. Holes must be bored so that the edge of the hole is at least ____. . Here we see a general purpose branch circuit. Branch Circuit Multi-wire A. The conductors and equipment that deliver energy from the serving utility to the wiring system of the premises are called the service, Service Conductors A. Conduit (Junction) Box, Conduit Body B. FS, FD and larger boxes (cast or sheet metal) are not classified as conduit bodies. A grounding electrode is a(n) ____ object that establishes a direct connection to earth. 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. Except for motor running overload protection, overcurrent devices may not interrupt the continuity of the grounded conductor unless all conductors of the circuit are opened simultaneously. 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. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS, C.THE TOTAL LOAD OF THE ADJACENT CIRCUIT DOES NOT EXCEED LOCAL STANDARDS, D.THE DISCONNECTING MEANS IS READILY ACCESSIBLE. Where the ampacity of the ungrounded conductors doesn't correspond with the standard rating of overcurrent protection devices as listed in 240.6(A), you can use the next higher protection device if it doesn't exceed 800A [240.4(B)]. Pay attention to other equipment that is (or will be) installed in the same room (or close to the transformer if in an open area). The given Statment T/F. Exposed noncurrent-carrying metal parts of fixed equipment that may become energized shall be grounded under any of the following conditions: If within 2.44 m (8 ft) vertically or 1.52 m (5 ft) horizontally of ground or grounded metal objects and subject to employee contact; If located in a wet or damp location and not isolated; If supplied by a metal-clad, metal-sheathed, or grounded metal raceway wiring method; or.
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