four-wire, three-phaseB. 5. Overcurrent Protection Article - InterNACHI Forum PDF Conductor Protection - OverCurrent Protection 450 only, a transformer is an individual power transformer (single- or 3-phase,)identified by a single nameplate unless otherwise indicated. luminaire. A lamp holder itself is not a luminaire. . Conduit (Junction) Box, Conduit Body B. FS, FD and larger boxes (cast or sheet metal) are not classified as conduit bodies. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 150 V.). One conductor of a single-phase, two-wire system shall be grounded; The neutral conductor of a single-phase, three-wire system shall be grounded; The common conductor of a multiphase system having one wire common to all phases shall be grounded; One phase conductor of a multiphase system where one phase is grounded shall be grounded; and. PPSX National Electrical Code 2004 - Quia 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. (A) Accessibility. Holes must be bored so that the edge of the hole is at least ____. The grounding electrode to which the portable equipment system neutral impedance is connected shall be isolated from and separated in the ground by at least 6.1 m (20.0 ft) from any other system or equipment grounding electrode, and there shall be no direct connection between the grounding electrodes, such as buried pipe, fence, and so forth. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. Notice the language is accessible to qualified personnel. This in no way inhibits making transformers inaccessible to unqualified personnel. Broken fiberD. The record shall be made available on the jobsite for inspection by the Assistant Secretary and any affected employee. I believe its not enough a little too broad. 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. 450.13 contains accessibility requirements. A) located within a grounded junction box B) the disconnecting means is readily accessible C) the total load of the adjacent circuit does not exceed local standards D) located adjacent to the equipment where access is achieved by the use of portable means Lighting Outlets A. 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. . ); Power conductors alone or above communication conductors: Communication conductors below power conductors -- same as power conductors; and. This receptacle is fed from a multi-wire branch circuit. Post author: Post published: June 10, 2022; Post category: printable afl fixture 2022; This type of protection is not required to be readily accessible as are branch circuit devices. The system complies with all other provisions of paragraph (g) of this section. NEC 2008 article 100 definitions. continuous Festoon Lighting B. Next we will jump to 240.24 Location in or on Premises. 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. What are Overcurrent Protection Devices? - Technical Articles - EE Power Main Equipment B. Conductive Path C. Grounded Neutral D. Bonding Jumper E. Bonding Conductor F. Grounding Electrode Conductor G. Grounding Electrode: The path installed with all the parts of the path A G. Guarded is defined as covered, shielded, fenced, enclosed, or otherwise protected by barriers, rails, screens, mats, or a platform removing the approach of contact by people or persons. Bonding Jumper (Main) An Equipment bonding jumper is the connection between two or more portions of the equipment grounding conductor. the same panelboard or similar distribution equipment. Overcurrent devices do not have to be readily accessible if ____. B. LOCATED WITHIN A GROUNDED JUNCTION BOX. The equipment grounding conductor shall be connected to its proper terminal; and. All rights reserved. Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. So, what does it really cover? 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. 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. Texas Electrical Code 2020 > 2 Wiring and Protection > 225 Outside Branch Circuits and Feeders . Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. All conductors of a multiwire branch circuit must originate from ____. An appliance branch circuit supplies energy to one or more outlets for the purpose of ____. 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. 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. Article 450 then takes you to the next logical step providing overcurrent protection and the proper connections. 250.12]. "must" or "must note penalties for noncompliance" b. shall" or "shall not suggested but discretionary ANS: PTS: Electrical Code REF: The National 10. The in-line fuse holder is not an outlet, because it is not part of the premises wiring system. A load having the maximum level of current sustained for three hours or more is referred to as a ____ load. A compartment or chamber having one or more attached air ducts and forming the distribution system is known as a plenum. That bonding is to be done per Table 250.122. A grounding electrode is a(n) ____ object that establishes a direct connection to earth. 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. To catch up on Lorenzo Mari's series on Overcurrent Protection, please visit: National Electrical Code Basics: Overcurrent Protection Part 1 . A: Article 406 of NEC covers the installation of receptacles of both grounded type and non-grounded, A: According to the question we need to Identify and Identify and describe the step-by-step process, A: All components of a photovoltaic system other than the solar panels are included in the balance of, A: Fiber optics is a technology that is connected with the transmission of information as light rays, A: Please find your answer below in step 2, A: Bartleby has policy to solve only first question and if it has subparts then solve only first 3, A: Pin encasings become excessively cumbersome an uneconomical past 33 kV. Different customers power, A: AWG or American Wire Gauge is the US standard measure for the diameter of electrical conductors. Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless supported by messenger wires. 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. 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. I dont like the 'new definition' of 'Branch circuit overcurrent device'. . 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. If you stick a fuse in a branch circuit, IMO, you have started a new branch circuit. Where connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. False. If the door is an inswing type, ensure the opened door will not block the transformer vent. Between the three-phase line and the disconnect switch. Power conductors below communication conductors -- 762 mm (30 in. 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. What else can you see that might impinge upon a safe and reliable installation? 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. Oddly enough, you will find the underlying concept in NFPA 70E, Standard for Electrical Safety in the Workplace. For dc circuits only, the equipment grounding conductor may be run separately from the circuit conductors. The switch is, A: Given, Conductors: With junction boxes of recessed luminaires can be accessed by removing part of the luminaire. 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. 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. For the purposes of Art. Cables running horizontally (or diagonally) are considered supported and secured when passing through a(n) ____. 4. Plenum (Space) B. Where a feeder overcurrent device is not readily accessible, branch-circuit overcurrent devices shall be installed on the load side, shall be mounted . Illustrated Guide to the National Electrical Unit 2 test - Quizlet or greater. Where the ground-fault circuit-interrupter protection required by paragraph (b)(3)(ii)(B) of this section is not available for receptacles other than 125-volt, single-phase, 15-, 20-, and 30-ampere, the employer shall establish and implement an assured equipment grounding conductor program covering cord sets, receptacles that are not a part of the building or structure, and equipment connected by cord and plug that are available for use or used by employees on those receptacles. Is other equipment in there? JavaScript is disabled. Check The Knowledge False A grounded conductor is a jumper to the main box on a feeder tube. Formal interpretations of the NEC are govered by regional construction authorities. See 210. You are right, and the other guy is wrong. Transformer top surfaces that are horizontal and readily accessible must be marked to prohibit storage on those surfaces. A surface, flush, or freestanding raceway designed to hold conductors and receptacles (in the field or the factory). D. THE DISCONNECTING MEANS IS READILY ACCESSIBLE. The service point is the point of connection between the facilities of the serving utility and the premises wiring. IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. True 1910.304(f)(1)(v) Fuses and circuit breakers shall be so located or shielded that employees will . Article 100 Electrical Code Definitions Understanding Code, Accessible Wiring components are considered accessible when access is gained without damaging the structure. I = VA (E 1.732) I = 45,000VA (480V 1.732) I = 54A. The overhead conductors between the utility electric supply and the service point. of the box. Branch Circuit Individual An individual branch circuit supplies only one piece of utilization equipment. 240.6(A)]. A motor disconnecting means must be located in sight from the motor location as required by 430. (B) Suspended Ceilings. National Electrical Code Basics: Overcurrent Protection Part 5 Overcurrent protection for transformers not over 1,000V. So, if the transformer vents face a beam-mounted or wall-mounted fire extinguisher, remove the extinguisher and remount it on something that is out of the vent exhaust path. Overcurrent protection shall not exceed _____. 5. Select one: 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.

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