A: The correct option along with the explanation is provided in the following section. OSHA 6.Underwriter's Laboratories NFPA TS: 1 REF: The National ANS: Electrical Code 8. 450.14] (Fig. Receptacle A. The _______ is required to be connected to the grounded conductor of the sensitive electronic system on the line side of the separately derived system disconnecting means. Overcurrent devices do not have to be readily accessible if ____. The materials that do not, A: Statement 1 : Ground is defined as earth. Nonmetallic-sheathed cable passing through holes in metal framing must be protected by ____ covering all metal edges. Dry locations are those not normally subject to moisture except on a temporary basis such as a building under Construction NEC. Note: Please do not handwritten. Neutral Conductor or Point C. The neutral point is the midpoint on a single-phase portion of a 3 phase Delta System. 110.14(C)(1)(a)(3) and Table 310.16]. Essentially, this Article covers transformers supplying power and lighting loads. ." 1910.304(f)(1)(v) Fuses and circuit breakers shall be so located or shielded that employees will . Readily Accessible | Mike Holt's Forum A. Main panel, Branch Circuit Multi-wire C. The one grounded Neutral conductor of a multi-wire circuit must be connected to the neutral or grounded conductor of the system Main panel, Branch Circuit Multi-wire D. All conductors of a multi -wire branch circuit must originate from the same panel board or similar distribution equipment. This tab has been removed to allow separate feeds of each outlet. "I have learned, in whatsoever STATE I am, therewi, http://www.usahardware.com/inet/shop/item/30550/icn/20-068163/bussman/bp_sru.htm. You are right, and the other guy is wrong. 2023 Endeavor Business Media, LLC. 5. A(n) ____ is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical, in nature. They cant be attached to any fire escape, downspout or plumbing equipment. 18. Tests performed as required in paragraph (b)(3)(ii)(C) of this section shall be recorded. Multi-Outlet Assembly A. as is. Enclosures are guarded against employee contact. Grounding Triad is the term which is missing in NATIONAL, A: Eachtelephone makes 0.5 calls/hour at 5 minutes. Plenum (Space) A. Meaning that if you had to get a ladder to reset this breaker, its considered accessible equipment as long as its not blocked. Between the three-phase line and the disconnect switch. Install the service disconnecting means at a readily accessible location. The main bonding jumper is connection at the service between the grounded circuit conductor and the equipment grounding conductor. I dont like the 'new definition' of 'Branch circuit overcurrent device'. located adjacent to the equipment where access is achieved by the use of portable means. In this example, a 70A breaker and 6 AWG conductor will meet Code requirements. What size primary-only protection overcurrent device and conductor is required for a 45kVA, 3-phase, 480V transformer that is fully loaded? Raceway containing branch circuit conductors in concrete, Conduit Body A conduit body is a separate portion of a conduit (tubing) system providing access to the interior of the system through a removable cover at a junction. LOCATED WITHIN A GROUNDED JUNCTION BOX B. Raceway fill calculations are a prerequisite in ____ needed for particular circuits. Step 2: Determine the primary overcurrent protection rating [Sec. , 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. 450.10(A)]. Ready accessibility to wiring in luminaires is required in all cases required when a building is considered public c.not required dat required if there is a junction bexaby ANS: PTS: REF: Definitions A load having the maximum level of current sustained for three hours or more is referred to as a load. 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. Bonding means that everything is connected or conductivity of the electron through wires. 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. four-wire, single-phase. #10. steve66 said: According to the definition of a branch circuit, it starts at the final overcurrent protection device. 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. Based on the 2020 NEC. Texas Electrical Code 2020 > 2 Wiring and Protection > 225 Outside Branch Circuits and Feeders . If equipment operates with any terminal at over 150 volts to ground. Reference 422.11(A). The performance are generally affected by the factors like lag in the compensating devices, slow response of the sys. service disconnect | Mike Holt's Forum 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.) See 210. Home > 2022 > June > 10 > Uncategorized > overcurrent devices do not have to be readily accessible if. Branch Circuit Individual An individual branch circuit supplies only one piece of utilization equipment. Thus, the receptacle outlet is the endpoint of the branch circuit, and the breaker in the panel is the circuit's final OCPD. 2). 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. the same panelboard or similar distribution equipment. Grounded Conductor Cont B. 450.13(A) and (B): (A) Open Installations. Fuses and circuit breakers shall be so located or shielded that employees will not be burned or otherwise injured by their operation. 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. Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____. 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. Identify each wire with a proper terminal marking, as shown in the example, above the disconnect switch. Communications conductors alone -- no requirement. Festoon Lighting A. Festoon lighting is a string of outdoor lights suspended between two points. B. Illustrated Guide to the National Electrical Unit 2 test - Quizlet Over residential property and driveways. Using an approved polyvinyl chloride conduitC. A contact device installed at an outlet for the connection of an attachment plug is a receptacle. You can use the breaker that supplies the transformer primary as the disconnecting means. 450.9]. Branch Circuit Multi-wire D. Although the box contains a multi-wire branch circuit, only one ungrounded (hot) conductor is feeding this duplex receptacle. That bonding is to be done per Table 250.122. Neutral Conductor or Point D. The neutral point is the midpoint on a single-phase portion of a 3 wire direct current system. This test record shall identify each receptacle, cord set, and cord- and plug-connected equipment that passed the test and shall indicate the last date it was tested or the interval for which it was tested. Find the preimage of www for the linear transformation. Fitting A. 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. Where connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. continuous. in 305 mm (12 in.) above the floor or working platform, unless one of the following applies: 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. 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. The neutral point is the common point on a Wye-connection in a polyphase system. 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. Installing a main bonding jumperB. Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. 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. They can also be installed in panelboards or control boards that are in rooms or enclosures free from dampness, easily ignitable material and accessible only to qualified personnel. On three-phase, three-wire circuits, an overcurrent relay in the residual circuit of the current transformers may replace one of the phase relays. A receptacle outlet shall be installed wherever flexible cords with attachment plugs are used. Branch Circuit Multi-wire A. Tenant access to panel | Mike Holt's Forum (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 150 V.). There are a wide variety of supplementary fuses and fuse holders, which have small physical dimensions . 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. 5. 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. Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. As shown in Figure 5, the electrical . Festoon Lighting C. Messenger wire(s), together with insulators is used to support conductors in all span exceeding 40 ft (12 m) in length. What can installation records be used to determine while servicing equipment?A. 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. But these and similar recommendations are the kinds of best practices that improve the performance, reliability, and safety of a transformer over its lifetime. If a delta-connected high voltage system is used to supply the equipment, a system neutral shall be derived. 240.24(A) Accessibility. - ElectricalLicenseRenewal.com A circuit breaker with a straight voltage rating, such as 240 V or 480 V, may only be installed in a circuit in which the nominal voltage between any two conductors does not exceed the circuit breaker's voltage rating. Figure F.1 has you start by establishing the context. If I understand the situation correctly (no guarantee of that! Power conductors below communication conductors -- 762 mm (30 in. A: The solution is provided in the following section: A: Cable Tester- Selecting the next higher standard size overcurrent protective device is NOT allowed. Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. 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. Use and identification of grounded and grounding conductors -, A nongrounding-type receptacle may be replaced with a ground-fault circuit-interrupter-type of receptacle that is marked "No Equipment Ground;" an equipment grounding conductor may not be connected from the ground-fault circuit-interrupter-type receptacle to any outlet supplied from the ground-fault circuit-interrupter receptacle; or. The definition of that word begins with, "A point on the premises wiring system. Over public streets, alleys, roads, and driveways. The service disconnecting means shall plainly indicate whether it is in the open or closed position and shall be installed at a readily accessible location nearest the point of entrance of the service-entrance conductors. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. A (n) ______ is a complete lighting unit consisting of a light. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies). Aug 12, 2009. three-wire, three-phaseD. This program shall comply with the following requirements: A written description of the program, including the specific procedures adopted by the employer, shall be available at the jobsite for inspection and copying by the Assistant Secretary of Labor and any affected employee; The employer shall designate one or more competent persons to implement the program; Each cord set, attachment cap, plug, and receptacle of cord sets, and any equipment connected by cord and plug, except cord sets and receptacles which are fixed and not exposed to damage, shall be visually inspected before each day's use for external defects, such as deformed or missing pins or insulation damage, and for indications of possible internal damage. Overcurrent protection for transformers not over 1,000V. Select one: A nongrounding-type receptacle may be replaced with a grounding-type receptacle where supplied through a ground-fault circuit-interrupter; the replacement receptacle shall be marked "GFCI Protected" and "No Equipment Ground;" an equipment grounding conductor may not be connected to such grounding-type receptacles. Above finished grade or sidewalks, or from any platform or projection from which they might be reached. Both the equipment grounding conductor and the grounding electrode conductor shall be connected to the grounded circuit conductor on the supply side of the service disconnecting means or on the supply side of the system disconnecting means or overcurrent devices if the system is separately derived. 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. See 210. Notwithstanding the provisions of paragraph (g)(6)(vi) of this section, the following equipment need not be grounded: Tools likely to be used in wet and conductive locations if supplied through an isolating transformer with an ungrounded secondary of not over 50 volts; and. Branch Circuits A. False. You dont want a person standing in the transformer vent path to reach a fire extinguisher. According to that same definition, the branch circuit ends at an outlet. What would you'all say about the installation if this sort of receptacle were used: Thanks for the responses. A load having the maximum level of current sustained for three hours or more is referred to as a ____ load. or greater. Signs warning of high voltage shall be posted where unqualified employees might come in contact with live parts. 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. 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. enclosed channel of metal (or nonmetallic) materials, article 100 defines raceway as a(n) ____designed expressly for holding wires, cables, or busbars. Example: Conductors connected to switches and receptacles are accessible by a removable plate or device. This prevents the equipment from being readily accessible to people in general and is a good safety measure. The space above a suspended ceiling used for environmental air-handling purposes is an example of other space used for environmental air described in 300. Listed or labeled portable tools and appliances if protected by an approved system of double insulation, or its equivalent, and distinctively marked. Article 230: Services Part 1 | EC&M termination. Enclosure for a motor starter, Equipment is a general term, including fittings, devices, appliances, luminaires, apparatus, machinery, and ect. 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. 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. n the Duplicate Busbar System, continuity of service is possible even if the Main, A: All the exposed noncurrent carrying metal parts of an information technology system shall be bonded, A: Correct option is B that is ELECTRIC GROUND CONDUCTORS must be capable of withstanding the higher, A: Jumpers allow the computer to shut down the electrical circuit, allowing electricity to flow to, A: Question. Holes must be bored so that the edge of the hole is at least ____. A motor disconnecting means must be located in sight from the motor location as required by 430. The service disconnecting means shall be installed at a readily accessible location either outside of a building or structure or inside nearest the point of entrance of the service conductors. Branch Circuit Multi-wire Multi-wire circuit consists of one (or more) duplex receptacles, one or more multiple receptacles single or combination. The definition of that word begins with, "A point on the premises wiring system. Just as any other overcurrent protective device . k=11k53\sum_{k=1}^{\infty} \frac{1}{\sqrt[3]{k^5}} A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. Service Lateral A. 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. Ducts used to transport dust, loose stock, or flammable vapors shall not contain ____ of any type. What is the angle pull for a raceway in the vertical dimension where the trade size of the largest raceway is 4 and the sum of the other raceways in the same row on the same wall is 5? The conductors from the service point to the service disconnecting means are known as service conductors. The service point is the point of connection between the facilities of the serving utility and the premises wiring. A separately derived system is a premises wiring system whose power is derived from a source of electric energy or equipment other than a service. . 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. According to that same definition, the branch circuit ends at an outlet. T/F. Overcurrent devices do not have to be readily accessible if located within anded jacobs k. the. Nec Flashcards | Quizlet Service equipment is that equipment (circuit breaker), switches, fuses, and other that is necessary to constitute the main control and cutoff that is connected to the load end of the service conductors. Accessible (Readily Accessible) Ready accessibility to wiring in luminaires is not required. A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary. The secondary conductor ampacity is not less than 1 10 of the rating of the overcurrent device protecting the primary of the transformer multiplied by the turns ratio. Draw clearly, neatly, and properly the Circuit Schematic Diagram for a SINGLE BUSBAR SYSTEM with BUS SECTIONALIZATION. Which agency is responsible for the maintenance and publication of the NEC ? 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. 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. communications system installation.C. National Electrical Code Basics: Overcurrent Protection Part 5 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. Damp locations are those subject to moderate degrees of moisture. 1. contiguous. You are right, and the other guy is wrong. A reduction in clearance above only the overhanging portion of the roof to not less than 457 mm (18 in.) Service Drop A. Lighting Outlets A. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. 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. First week only $4.99! The in-line fuse holder is not an outlet, because it is not part of the premises wiring system. 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. The supply systems for sensitive electronic equipment are _______ systems.A. The following additional requirements apply to feeders only: Conductors tapped to a feeder may be protected by the feeder overcurrent device where that overcurrent device also protects the tap conductor. equipment grounding terminal bus Proper transformer selection is an important part of preventing transformers from overheating. Cables entering or exiting conduit used for support or protection against physical damage require fittings on the conduit ends to prevent ____. luminaire. The long-time trip element setting of a breaker or the minimum trip setting of an electronically actuated fuse may not exceed six times the ampacity of the conductor. f(x)=4x+53. 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. You will have to check the listing of the fuse and fuse holder. Grounded (grounding) is defined as being connected to ground or to a conductive body that extends to the a ground connection. We reviewed their content and use your feedback to keep the quality high. Hrone dans la guerre de 100 ans (100 years war). The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame. Neutral Conductor or Point B. . Thus, you do not create a new branch circuit. Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. Duplexes control outlets of energy, as well as switches and can be used in conjunction such as a garbage disposal, Enclosed Equipment, conductors, ect.
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