overcurrent devices do not have to be readily accessible if

That plug-in breaker thing is a piece of utilization equipment. . 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 continuous ampere rating of a fuse may not exceed three times the ampacity of the conductors. Select one: Location Wet A. OSHA 6.Underwriter's Laboratories NFPA TS: 1 REF: The National ANS: Electrical Code 8. Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. An overcurrent relay, operated from a current transformer that links all phases of a three-phase, three-wire circuit, may replace the residual relay and one other phase-conductor current transformer. Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. 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. A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary. Branch Circuit Appliance An appliance branch circuit supplies energy to one or more outlets for the purpose of connecting appliances. 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. For each given ppp-series, identify ppp and determine whether the series converges. Label your diagram. Broken connectors in a cable linkB. Location Dry A. located adjacent to the equipment where access is achieved by the use of portable means. Cord connections. A(n) ____ is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical, in nature. The overhead conductors between the utility electric supply and the service point. What is different about table 250.122 versus the other tables we have been using is that it is based on the rating of the overcurrent device, often a circuit breaker of fuse, that is ahead of the circuit that could cause the system to become energized. Two exceptions to the make readily accessible rule are noted in Sec. Listed or labeled portable tools and appliances if protected by an approved system of double insulation, or its equivalent, and distinctively marked. Holes must be bored so that the edge of the hole is at least ____. Multi-Outlet Assembly A. A duplex receptacle can be supplied by two branch circuits by removing the tab. 450.9]. However, equipment that is guarded by location and isolated from ground need not be grounded. Grounded (grounding) is defined as being ____. Courtesy ofwww.MikeHolt.com. All conductors of a multiwire branch circuit must originate from ____. A grounding electrode is a(n) ____ object that establishes a direct connection to earth. Grounding triad The NEC assumes you have already selected a transformer suitable for the load characteristics. You are right, and the other guy is wrong. These materials are provided by Mike Holt Enterprises in Leesburg, Fla. To view Code training materials offered by this company, visit www.mikeholt.com/code. 240.6(A) and Table 450.3(B) Note 1]. An ____ is the organization, office, or individual responsible for enforcing the requirements of a code. 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. 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. neutral ground strap Article 450 of the National Electrical Code (NEC) opens by saying, This article covers the installation of all transformers. Then it lists eight exceptions. 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. Selective coordination Overcurrent devices do not have to be readily accessible if ____. Systems supplying portable or mobile high voltage equipment, other than substations installed on a temporary basis, shall comply with the following: The system shall have its neutral grounded through an impedance. Just as any other overcurrent protective device . 70 for switch controlled, Concealed Concealed means rendered inaccessible by the structure of finish of a building Conductors in concealed raceways, even though they become accessible by withdrawing them, are still considered concealed. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. 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. However, receptacles of cord- and plug-connected arc welders may have ampere ratings not less than the minimum branch-circuit conductor ampacity. Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. 450.14] (Fig. Over commercial areas subject to truck traffic. termination. (A) Accessibility. Article 100 Electrical Code Definitions Understanding Code, Accessible Wiring components are considered accessible when access is gained without damaging the structure. Hrone dans la guerre de 100 ans (100 years war). 100]. LOCATED WITHIN A GROUNDED JUNCTION BOX. Overcurrent devices do not have to be readily accessible if ____. 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. True white, gray, green, or, green with yellow stripe(s). See 210. National Firefighters Association (NFA) Underwriter's Laboratory (UL) National Fire Protection Association (NFPA) 1 ANS: PTS: Electrical Code REF: The National 9. Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. What would you'all say about the installation if this sort of receptacle were used: Thanks for the responses. Overcurrent protection shall not exceed _____. 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. a. Over residential property and driveways. Decreased bending radius during operation, Which of the following is a term missing from the National Electrical Code but used by manufacturers of equipment that's suitable for use as service equipment? They cant be attached to any fire escape, downspout or plumbing equipment. Ground detectors are installed on the control system; If the system is an isolated power system that supplies circuits in health care facilities; or. The conductor must be sized to accommodate the 70A primary overcurrent protection per Sec. You can use the breaker that supplies the transformer primary as the disconnecting means. Never set two transformers with their vents facing each other. 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. Luminaire A luminaire is a complete lighting unit consisting of a light source such as a lamp or lamps, together with the parts designed to position the light source and connect it to the power supply. The. Receptacles installed on 15- and 20-ampere branch circuits shall be of the grounding type except as permitted for replacement receptacles in paragraph (b)(2)(iv) of this section. 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. Generally, ungrounded (hot) conductors can be any color except ____. A: The solution is provided in the following section: A: Cable Tester- Which agency is responsible for the maintenance and publication of the NEC ? The equivalent of ____ is the maximum allowed between pull points. Fitting A. A conductor used as an equipment grounding conductor shall be identifiable and distinguishable from all other 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'?? National Association of Electrical Engineers (NAEE b. Nonconductive coatings on transformer enclosures must be removed to ensure electrical continuity, or the termination fittings must be designed to make such removal unnecessary [Sec. Grounded (grounding) is defined as being connected to ground or to a conductive body that extends to the a ground connection. Volume in boxes can be increased by using ____ rings, domed covers, extension rings, or similar items. 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. 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. The grounding contacts of receptacles and cord connectors shall be grounded by connection to the equipment grounding conductor of the circuit supplying the receptacle or cord connector. 2023 Endeavor Business Media, LLC. 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.) Branch Circuit Multi-wire D. Although the box contains a multi-wire branch circuit, only one ungrounded (hot) conductor is feeding this duplex receptacle. 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. Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. 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. The standard ampere ratings for fuses include (s) _____. Thus, you do not create a new branch circuit. The area above a roof surface subject to pedestrian or vehicular traffic shall have a vertical clearance from the roof surface in accordance with the clearance requirements of paragraph (c)(2) of this section. enclosed channel of metal (or nonmetallic) materials, article 100 defines raceway as a(n) ____designed expressly for holding wires, cables, or busbars. Conduit (Junction) Box, Conduit Body B. FS, FD and larger boxes (cast or sheet metal) are not classified as conduit bodies. 3. This type of protection is not required to be readily accessible as are branch circuit devices. All rights reserved. Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____. Prior to the 2017 NEC, "overcurrent devices" were required to be readily accessible. A. 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. Ensure the room is vented either via door vents that cannot be blocked or (preferably) an exhaust vent to the outside. This can be outside the structure. 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. A: The correct option along with the explanation is provided in the following section. A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame. Which of the following would help avoid the choke effect in grounding electrode conductors?A. 240.6(A). . The switch is, A: Given, 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. If a vented dry-type transformer is installed in an equipment room with a door: A terminal bar for equipment grounding conductors (EGCs), system bonding jumpers, supply-side bonding jumpers, and grounding electrode conductors (GECs) must be installed and bonded inside the transformer enclosure [Sec. An appliance branch circuit supplies energy to one or more outlets for the purpose of ____. The weight supported by any single conduit shall not exceed ____ pounds. Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. Service Point A. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). Find the inverse of the function with the domain given. 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. The service point is the point of connection between the facilities of the serving utility and the premises wiring. Metal car frames supported by metal hoisting cables attached to or running over metal sheaves or drums of grounded elevator machines are also considered to be effectively grounded. Branch Circuit The circuit conductors found between a circuits final overcurrent protective device (breaker) and the circuits outlet is called a branch circuit. 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? LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. Overcurrent protection for transformers not over 1,000V. 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. Dry locations are those not normally subject to moisture except on a temporary basis such as a building under Construction NEC. 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. Primary Conductor = 6 AWG conductor rated 65A at 75C [Sec. AC systems of 50 volts to 1000 volts are not required to be grounded under any of the following conditions: If the system is used exclusively to supply industrial electric furnaces for melting, refining, tempering, and the like; If the system is separately derived and is used exclusively for rectifiers supplying only adjustable speed industrial drives; If the system is separately derived and is supplied by a transformer that has a primary voltage rating less than 1000 volts, provided all of the following conditions are met: The system is used exclusively for control circuits; The conditions of maintenance and supervision ensure that only qualified persons will service the installation; Continuity of control power is required; and. Electric Metal Tubing (EMT) provides protection from ____. 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. 4 A through D for additional requirements. Overcurrent devices do not have to be readily accessible if ____. Listed equipment protected by a system of double insulation, or its equivalent, and distinctively marked as such. Primary Overcurrent Protection = 54A 125% = 68A; use the next size up, 70A [Sec. For installations made before April 16, 1981, electric equipment is also considered to be effectively grounded if it is secured to, and in metallic contact with, the grounded structural metal frame of a building. If a delta-connected high voltage system is used to supply the equipment, a system neutral shall be derived. T/F. 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. All this can be considered equipmentpretty much anything sold at home depot, Feeder B. You are right, and the other guy is wrong. There are a wide variety of supplementary fuses and fuse holders, which have small physical dimensions . Step back from the transformer installation task itself, and look at the context that is, see the forest and not just the tree you are working on. 18. For fire pumps, conductors may be protected for short circuit only; and. 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. Identify and describe the step-by-step process used to install cable in the NCT Colledge buildings? Appliance Utilization equipment of a commonly built-in standard, installed as a unit such as AC, or a stove. 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. A fixed or portable optional standby systems, A: Choose the correct option Between the three-phase line and the disconnect switch. Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. I would only agree if the fuse were within the premises wiring system. Circuit breakers and fuses must be readily accessible [240.24]. - Receptacle Ratings for Various Size Circuits. Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. B. Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. 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.) 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. Replacement of receptacles shall comply with the following requirements: Where a grounding means exists in the receptacle enclosure or a grounding conductor is installed, grounding-type receptacles shall be used and shall be connected to the grounding means or conductor; Ground-fault circuit-interrupter protected receptacles shall be provided where replacements are made at receptacle outlets that are required to be so protected elsewhere in this subpart; and.

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