The neutral point is the common point on a Wye-connection in a polyphase system. Neutral disconnect link My view is that anything that gets plugged into a receptacle outlet is not part of the premises wiring system. Select one: A. 102. 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. Fitting A. Cable installed under a building must be ____ unless the wiring method is Type MC or Type MI cable that is identified for direct burial. 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'?? Service Drop A. Metal enclosures for service equipment shall be grounded. luminaire. This receptacle is fed from a multi-wire branch circuit. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. 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. 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. A receptacle outlet shall be installed wherever flexible cords with attachment plugs are used. If equipment operates with any terminal at over 150 volts to ground. ); Power conductors alone or above communication conductors: Communication conductors below power conductors -- same as power conductors; and. Bonding Jumper (Main) An Equipment bonding jumper is the connection between two or more portions of the equipment grounding conductor. 22. There are a wide variety of supplementary fuses and fuse holders, which have small physical dimensions . A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). "Readily accessible" means located so a person can reach it quickly without having to climb over (or remove) obstacles, or use a portable ladder. The conductors are terminated at a through-the-roof raceway or approved support. See 210. Part I contains the general requirements (such as guarding, marking, and accessibility), and Part II contains requirements for specific types of transformers. The weight supported by any single conduit shall not exceed ____ pounds. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. In Sight A. NEC defines in sight from, within, or within sight to the applied equipment and indicates that specified items or equipment is visible and not more than 50 Ft. apart. Over residential property and driveways. Article 450 then takes you to the next logical step providing overcurrent protection and the proper connections. neutral disconnect link, 18. k=11k53\sum_{k=1}^{\infty} \frac{1}{\sqrt[3]{k^5}} 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. What might block airflow? If that is right, then the in-line fuse (whether or not rated as a branch circuit OCPD) does not establish the beginning of a branch circuit, and the wires upstream (i.e., up to the receptacle, and from the receptacle back to the panel) have not been re-designated as a feeder. Overcurrent devices do not have to be readily accessible if ____. Broken connectors in a cable linkB. 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. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. Article 230.70 (A)(1) (1) Readily Accessible Location. Wiring components are considered accessible if, Accessible learning experience design and implementation, Has virtual functions and accessible non-virtual destructor, Examples of accessible instructional materials. Applying solder to the connectionD. 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. source such as a lamp or lamps, together with the parts designed to position the light source and to connect it to the power supply. Adding an air intake vent and then adding a fan in the exhaust ducting will make the room more tolerable for both the transformer(s) and the electricians working in that room. All rights reserved. Select one: A. These circuits exclude the connection of luminaires (lights) unless they are part of the appliance being connected. Bonding Jumper (Main) When metal parts are required to be electrically connected, a reliable conductor (Bonding Jumper) is installed, thereby guaranteeing electrical conductivity. 450.10(A)]. 240.6(A). These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. It comprises a, A: ANSWER (1) Alternatively, you can also use a properly rated safety switch. Nec Flashcards | Quizlet Where the neutral is not grounded on the load side of the circuit, the current transformer may link all three phase conductors and the grounded circuit conductor (neutral); and. 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. B. Much of what weve discussed here isnt explicitly required by the NEC. Stumped by the Code? A conductor used as an equipment grounding conductor shall be identifiable and distinguishable from all other conductors. Not be located where they will be in the . Thus, you do not create a new branch circuit. The service lateral is the underground conductors between the utility electric supply system and the service point. B. So you cannot plug this appliance into a receptacle outlet that is fed from a 20 amp branch circuit, because their is a protective limit marked on the appliance. . 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. LOCATED WITHIN A GROUNDED JUNCTION BOX, B. Oddly enough, you will find the underlying concept in NFPA 70E, Standard for Electrical Safety in the Workplace. Aug 12, 2009. 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. Always install transformers per the manufacturers instructions and ensure transformer ventilating openings are not blocked by walls or other obstructions [Sec. "I have learned, in whatsoever STATE I am, therewi, http://www.usahardware.com/inet/shop/item/30550/icn/20-068163/bussman/bp_sru.htm. Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. 450.13 contains accessibility requirements. 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. Readily Accessible, Jam Factor and More - Electrical Contractor Magazine overcurrent devices do not have to be readily accessible if PDF Conductor Protection - OverCurrent Protection Each conductor intentionally grounded must have . In addition, a single disconnecting means is permitted on the supply side of more than one set of fuses as permitted by the exception in 1910.305(j)(4)(vi) for group operation of motors, and a single disconnecting means is permitted for fixed electric space-heating equipment. Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. I would only agree if the fuse were within the premises wiring system. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. Overcurrent devices do not have to be readily accessible if ____. 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 ____. 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. continuous 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. Check The Knowledge False A grounded conductor is a jumper to the main box on a feeder tube. Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. 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. LOCATED WITHIN A GROUNDED JUNCTION BOX B. 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 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. A contact device installed at an outlet for the connection of an attachment plug is a receptacle. Service A. 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. I = VA (E 1.732) I = 45,000VA (480V 1.732) I = 54A. ", The continuous ampere rating of a fuse may not exceed three times the ampacity of the conductors. All noncurrent-carrying metal parts of portable equipment and fixed equipment, including their associated fences, housings, enclosures, and supporting structures, shall be grounded. However, a current-limiting device without a disconnecting means is permitted on the supply side of the service disconnecting means. Overcurrent Protection Article - InterNACHI Forum . National Association of Electrical Engineers (NAEE b. 4. False. 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. A surface, flush, or freestanding raceway designed to hold conductors and receptacles (in the field or the factory). Over residential property and driveways. Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. outer liquidtight, nonmetallic, sunlight-resistant jacket. 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. (B) Suspended Ceilings. 2). overcurrent devices do not have to be readily accessible if Ground-fault detection and relaying shall be provided to automatically deenergize any high voltage system component that has developed a ground fault. Dont install a transformer below a water heater that is on a mezzanine or similar elevation. 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. Ground detectors are installed on the control system; If the system is an isolated power system that supplies circuits in health care facilities; or. Cable tester detects the, A: Materials that allow current to flow through them are called conductors. Selecting the next higher standard size overcurrent protective device is NOT allowed. Draw clearly, neatly, and properly the Circuit Schematic Diagram for a SINGLE BUSBAR SYSTEM with BUS SECTIONALIZATION. Circuit breakers and fuses must be readily accessible [240.24]. 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. This prevents the equipment from being readily accessible to people in general and is a good safety measure. A(n) ____ is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical, in nature. Identify and describe the step-by-step process used to install cable in the NCT Colledge buildings? Volume in boxes can be increased by using ____ rings, domed covers, extension rings, or similar items. Location Dry A. So, what does it really cover? You are right, and the other guy is wrong. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). IMO 422.11 (E) 3 permits him to do this WITHOUT the fuse. PPSX National Electrical Code 2004 - Quia termination. Listed or labeled portable tools and appliances if protected by an approved system of double insulation, or its equivalent, and distinctively marked. Exposed runs of Type AC cable installed on the underside of joists must be supported at ____. 3. Generally, ungrounded (hot) conductors can be any color except ____. A. This can be outside the structure. Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. Bonding Connected to establish electrical continuity and conductivity. A fuse is an electrical gadget used to shield the circuit from overcurrent. Circuit breakers shall clearly indicate whether they are in the open (off) or closed (on) position. 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)]. Cable tester is a device which is used to test a cable. Thus, the receptacle outlet is the endpoint of the branch circuit, and the breaker in the panel is the circuit's final OCPD. Type AC cable must have a bending radius at least ____ times the diameter of the cable. All this can be considered equipmentpretty much anything sold at home depot, Feeder B. 5 Key Considerations for Single Family Residential Electrical - NFPA Knowing the NEC rules for transformers is only a start. f(x)=4x+53. 240.6(A)], the next higher rating is permitted [Sec. Liquidtight flexible metal conduit (LFMC) is a raceway of circular cross section having a(n) ____ over an inner flexible metal core. The definition of that word begins with, "A point on the premises wiring system. 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. 1910.306 - Occupational Safety and Health Administration Neutral Conductor or Point C. The neutral point is the midpoint on a single-phase portion of a 3 phase Delta System.
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