overcurrent devices do not have to be readily accessible if

A conductor used as a grounded conductor shall be identifiable and distinguishable from all other conductors. You can use the breaker that supplies the transformer primary as the disconnecting means. 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. 28(7x2)5dx,u=7x2, A(n) ____ is a device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing. Neutral Conductor or Point C. The neutral point is the midpoint on a single-phase portion of a 3 phase Delta System. white, gray, green, or, green with yellow stripe(s). 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. A fixed or portable optional standby systems, A: Choose the correct option Overcurrent devices do not have to be readily accessible if ____. Step 2: Determine the primary overcurrent protection rating [Sec. 100]. What size primary-only protection overcurrent device and conductor is required for a 45kVA, 3-phase, 480V transformer that is fully loaded? 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? A reduction in clearance above only the overhanging portion of the roof to not less than 457 mm (18 in.) All this can be considered equipmentpretty much anything sold at home depot, Feeder B. It may be tempting for some people to use that room as a storage area. 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. Generally, ungrounded (hot) conductors can be any color except ____. 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. 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. . 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. The terminals are rated 75C (Fig. A major concern with transformers is preventing overheating. of the box. Circuit breakers shall clearly indicate whether they are in the open (off) or closed (on) position. Which of the following would help avoid the choke effect in grounding electrode conductors?A. In this example, the receptacle is that outlet. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). Cables running horizontally (or diagonally) are considered supported and secured when passing through a(n) ____. Figure F.1 has you start by establishing the context. Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. Metal cable trays, metal raceways, and metal enclosures for conductors shall be grounded, except that: Metal enclosures such as sleeves that are used to protect cable assemblies from physical damage need not be grounded; and. Overcurrent devices do not have to be readily accessible if ____. All termination points are rated at 60 degrees Celsius Thus, the receptacle outlet is the endpoint of the branch circuit, and the breaker in the panel is the circuit's final OCPD. , 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. T(v1,v2,v3)=(v1+v2,v2+v3,v3)T(v_1, v_2,v_3) = (v_1+v_2, v_2+v_3, v_3) Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. 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. This record shall be kept by means of logs, color coding, or other effective means and shall be maintained until replaced by a more current record. Overcurrent protection for transformers not over 1,000V. Receptacle A. Is this in a room with an inswing door? Article 450 then takes you to the next logical step providing overcurrent protection and the proper connections. Neutral Conductor or Point B. 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. Wire connectors, pigtails, locknuts, bushings, raceway connectors, grounding screws, and equipment bonding jumpers are not factors when calculating ____. Never set two transformers with their vents facing each other. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. To catch up on Lorenzo Mari's series on Overcurrent Protection, please visit: National Electrical Code Basics: Overcurrent Protection Part 1 . Festoon Lighting A. Festoon lighting is a string of outdoor lights suspended between two points. , which is used indirectly or directly on electrical installations. So, what does it really cover? As long as you can remove the trim and access the junction box it will be considered readily accessible! above the floor or working platform, unless one of the following applies: What else can you see that might impinge upon a safe and reliable installation? continuous Signs warning of high voltage shall be posted where unqualified employees might come in contact with live parts. Find the preimage of www for the linear transformation. A two-pole circuit breaker may not be used for protecting a 3-phase, corner-grounded delta circuit unless the circuit breaker is marked 1 -- 3 to indicate such suitability. termination. Each service disconnecting means shall simultaneously disconnect all ungrounded conductors. Code Change Summary: Revised code language on the accessibility requirements for overcurrent devices. 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. connected to ground or to a conductive body that extends the ground connection. Check The Knowledge False Not readily accessible means you dont have to worry about it at all or ever have to service it? 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. Just as any other overcurrent protective device . Rigid metal conduit (RMC) is a raceway of ____. B. 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. An ____ is the organization, office, or individual responsible for enforcing the requirements of a code. 240.6(A) and Table 450.3(B) Note 1]. or greater. Ground is defined as earth. A neutral conductor is defined as the conductor connected to the ____ that is intended to carry current under normal conditions. 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. 450 only, a transformer is an individual power transformer (single- or 3-phase,)identified by a single nameplate unless otherwise indicated. I would only agree if the fuse were within the premises wiring system. It has no direct connection from circuit conductors. Plenum (Space) B. The continuity of the equipment grounding conductor shall be continuously monitored so as to deenergize automatically the high voltage feeder to the portable equipment upon loss of continuity of the equipment grounding conductor. Each service disconnecting means shall be suitable for the prevailing conditions. All conductors of a multiwire branch circuit must originate from ____. Draw clearly, neatly, and properly the Circuit Schematic Diagram for a SINGLE BUSBAR SYSTEM with BUS SECTIONALIZATION. Holes must be bored so that the edge of the hole is at least ____. Overcurrent devices do not have to be readily accessible if ____. 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. Alternatively, you can also use a properly rated safety switch. Location Wet A. 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. 5. 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. Here we see a general purpose branch circuit. If you substitute installation quality for personal safety risk, you could use Figure F.1 of Informative Annex F to identify and correct potential problems with the installation. fire protection system.D. If a bollard will be installed, ensure there will be enough space on the bollard side of the transformer for maintenance and repair. 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. 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. 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. Aug 12, 2009. 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. in 305 mm (12 in.) A: The solution is provided in the following section: A: Cable Tester- This prevents the equipment from being readily accessible to people in general and is a good safety measure. 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 service lateral is the underground conductors between the utility electric supply system and the service point. Overcurrent protection simply means a fuse, breaker, or fusible link is used to protect the equipment . A listener nearby in a 20^ {\circ} \mathrm {C} 20C room hears a note with a wavelength of 40 cm. Two exceptions to the make readily accessible rule are noted in Sec. LOCATED WITHIN A GROUNDED JUNCTION BOX. Location Damp A. A. 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 the circuit\'s overcurrent device exceeds _____, the conductor ampacity shall have a rating not less than the rating of the overcurrent device. 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. 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 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. An AFCI is basically like a GFCI but it will protect the entire circuit from the breaker and back. Select one: The neutral point is the common point on a Wye-connection in a polyphase system. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. 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. You dont want a person standing in the transformer vent path to reach a fire extinguisher. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. tribale maximize ANS: PTS: REF: Definitions 5 A contact device installed at an outlet for the connection of an attachment plug is an) rumpor und Sutlet canale ANS: PTS: REF: Definitions 6. It may not display this or other websites correctly. My view is that anything that gets plugged into a receptacle outlet is not part of the premises wiring system. Each conductor intentionally grounded must have . There was general agreement that climbing over or under something would render equipment accessible but not readily accessible. Where flexible cords are permitted to be permanently connected, receptacles may be omitted. Thus, you do not create a new branch circuit. Transformer top surfaces that are horizontal and readily accessible must be marked to prohibit storage on those surfaces. 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. This tab has been removed to allow separate feeds of each outlet. Branch Circuits. 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. 240.4(B). The biggest hang up we had was the use of the word "obstacle." 450.9 provides ventilation requirements, and Sec. This type of protection is not required to be readily accessible as are branch circuit devices. Branch Circuit Individual An individual branch circuit supplies only one piece of utilization equipment. 1. contiguous. You can never fix power quality problems by introducing grounding or bonding errors at the transformer or anywhere else. Type AC cable must have a bending radius at least ____ times the diameter of the cable. Outlet A point in a wiring system from which current is taken to supply utilization equipment is known as an outlet. The service point is the point of connection between the facilities of the serving utility and the premises wiring. A lamp holder itself is not a luminaire. 450.13]. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. Courtesy ofwww.MikeHolt.com. ); Power conductors alone or above communication conductors: Communication conductors below power conductors -- same as power conductors; and. Also, suggest that card access to the room be granted only to people who fit OSHAs definition of a qualified worker per the equipment inside the room. The following requirements apply to temporary wiring installations that are used during construction-like activities, including certain maintenance, remodeling, or repair activities, involving buildings, structures or equipment. . 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. 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. 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. 225.40 Wiring and Protection, Access to Overcurrent Protective Devices. The definition of that word begins with, "A point on the premises wiring system. Within sight means it is visible and not more than 50 ft from the equipment [Art. There are a wide variety of supplementary fuses and fuse holders, which have small physical . 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]. of its overcurrent devices protecting branch circuits of 30A or less, shall have individual protection on the line side not greater than the rating of the . Enclosures are guarded against employee contact. False. #10. steve66 said: According to the definition of a branch circuit, it starts at the final overcurrent protection device. 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. 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 . 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. True Separately Derived System B. 450.14] (Fig. 110.25 [Sec. 450.9]. Transformers must be readily accessible to qualified personnel for inspection and maintenance [Sec. 450.13(A) and (B): (A) Open Installations. Evaluate the indefinite integrals in this exercise by using the given substitution to reduce the integral to standard form. One of the most common applications for "readily accessible" occurs in 240.24(A), in which the NEC states that overcurrent devices must be readily accessible and installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than 6 feet, 7 inches above the floor . A cable assembly's ____ conductor can be used as a switch loop (leg) in single-pole, three-way, and four-way switch installations, even though it is an ungrounded (hot) conductor. For an ungrounded separately derived system, the equipment grounding conductor shall be connected to the grounding electrode conductor at, or ahead of, the system disconnecting means or overcurrent devices. . Identify each wire with a proper terminal marking, as shown in the example, above the disconnect switch. located adjacent to the equipment where access is achieved by the use of portable means. According to that same definition, the branch circuit ends at an outlet. Service A. 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. overcurrent devices do not have to be readily accessible if. I think you need to back up a few paragraphs, within article 100. A motor disconnecting means must be located in sight from the motor location as required by 430. I believe its not enough a little too broad. A fitting is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical in nature. Branch Circuit The circuit conductors found between a circuits final overcurrent protective device (breaker) and the circuits outlet is called a branch circuit. If you can move this dresser, and it has a cover plate its accessible. 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. Noncurrent-carrying metal parts of fixed equipment, if required to be grounded by this subpart, shall be grounded by an equipment grounding conductor that is contained within the same raceway, cable, or cord, or runs with or encloses the circuit conductors. 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'?? Fuses and circuit breakers shall be so located or shielded that employees will not be burned or otherwise injured by their operation. the same panelboard or similar distribution equipment. Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder . First week only $4.99! The materials that do not, A: Statement 1 : Notice the language is accessible to qualified personnel. This in no way inhibits making transformers inaccessible to unqualified personnel. the light source only c. a complete lighting unit b. the lamp holder d. parts to position the light source ANS: PTS: Experts are tested by Chegg as specialists in their subject area. 22. 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. 110.14(C)(1)(a)(3) and Table 310.16]. overcurrent devices do not have to be readily accessible if. - Maximum Cord- and Plug-Connected Load to Receptacle, Table S-5. That plug-in breaker thing is a piece of utilization equipment. 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. All noncurrent-carrying metal parts of portable equipment and fixed equipment, including their associated fences, housings, enclosures, and supporting structures, shall be grounded. Listed equipment protected by a system of double insulation, or its equivalent, and distinctively marked as such. Service Equipment A. A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). Hrone dans la guerre de 100 ans (100 years war). 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 Code does not completely address this issue. conducting. A grounded conductor is a system or circuit conductor that is intentionally grounded. According to Note 1 of Table 450.3(B), transformers having a primary current rating of 9A or more are permitted to use the next size up rule when 125% of the primary current doesnt correspond to the standard rating of a fuse or nonadjustable circuit breaker listed in Sec. 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. The record shall be made available on the jobsite for inspection by the Assistant Secretary and any affected employee. "Readily accessible" means located so a person can reach it quickly without having to climb over (or remove) obstacles, or use a portable ladder. 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. . 102. Bonding Connected to establish electrical continuity and conductivity. Ducts used to transport dust, loose stock, or flammable vapors shall not contain ____ of any type. This receptacle is fed from a multi-wire branch circuit. Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless supported by messenger wires. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. Verified Answer for the question: [Solved] Overcurrent devices do not have to be readily accessible if ____. 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.) Metal enclosures for service equipment shall be grounded. 5. 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. 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. Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. The definition of that word begins with, "A point on the premises wiring system. The word luminaire refers to . Where connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. A compartment or chamber having one or more attached air ducts and forming the distribution system is known as a plenum. Indicate your answer where indicated. JavaScript is disabled. Above finished grade or sidewalks, or from any platform or projection from which they might be reached.
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