Note: Please do not handwritten. Grounded Conductor Cont B. This can be outside the structure. Conductors and equipment shall be protected from overcurrent in accordance with their ability to safely conduct current. 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. "Readily accessible" means located so a person can reach it quickly without having to climb over (or remove) obstacles, or use a portable ladder. Overcurrent Protection Device Overcurrent Protection (Breaker) A branch-circuit overcurrent protection is a device capable of protecting feeders, branch circuits, service equipment between its rated current and its interrupting rating. A surface, flush, or freestanding raceway designed to hold conductors and receptacles (in the field or the factory). Type AC cable must have a bending radius at least ____ times the diameter of the cable. 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. A fitting is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical in nature. 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. - Maximum Cord- and Plug-Connected Load to Receptacle, Table S-5. The weight supported by any single conduit shall not exceed ____ pounds. A wire, bus, screw, or similar suitable conductor is acceptable as a main bonding. Not be located where they will be in the . fire protection system.D. It comprises a, A: ANSWER (1) 4. A. Part I contains the general requirements (such as guarding, marking, and accessibility), and Part II contains requirements for specific types of transformers. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. Feeder and branch-circuit conductors shall have overcurrent protection in each ungrounded conductor located at the point where the conductor receives its supply or at a location in the circuit determined under engineering supervision; Circuit breakers used for overcurrent protection of three-phase circuits shall have a minimum of three overcurrent relays operated from three current transformers. Article 240 -Overcurrent Protection Flashcards | Quizlet On three-phase, three-wire circuits, an overcurrent relay in the residual circuit of the current transformers may replace one of the phase relays. 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. Occupational Safety & Health Administration. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 150 V.). For the purposes of Art. Dont install a transformer with the vent facing a distribution panel, cable rack, or other equipment that needs cool air. Answered: Overcurrent devices do not have to be | bartleby 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. What are the steps for plotting points on microstation uisng offset, station, side and elevation? Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. An appliance branch circuit supplies energy to one or more outlets for the purpose of ____. If I understand the situation correctly (no guarantee of that! In most cases, access can be gained through the use of a ladder or scaffolding ect. What is the angle pull for a raceway in the horizontal dimension where the trade size of the largest raceway is 3 and the sum of the other raceways in the same row on the same wall is 4?v. The conductors and equipment that deliver energy from the serving utility to the wiring system of the premises are called the service, Service Conductors A. 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. This receptacle is fed from a multi-wire branch circuit. 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. enclosed channel of metal (or nonmetallic) materials, article 100 defines raceway as a(n) ____designed expressly for holding wires, cables, or busbars. LOCATED WITHIN A GROUNDED JUNCTION BOX. . However, a current-limiting device without a disconnecting means is permitted on the supply side of the service disconnecting means. Install the service disconnecting means at a readily accessible location. For an ungrounded service-supplied system, the equipment grounding conductor shall be connected to the grounding electrode conductor at the service equipment. Service Lateral A. A. A fuse is an electrical gadget used to shield the circuit from overcurrent. maximum fuse or circuit breaker size =, 4.a. Article 100 Electrical Code Definitions Understanding Code, Accessible Wiring components are considered accessible when access is gained without damaging the structure. 240.4(B). The overhead conductors between the utility electric supply and the service point. The neutral conductor of a multiphase system in which one phase is used as a neutral conductor shall be grounded. Courtesy ofwww.MikeHolt.com. The neutral point is the midpoint on a single-phase portion of a 3 wire system. 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. IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. Over public streets, alleys, roads, and driveways. Home > 2022 > June > 10 > Uncategorized > overcurrent devices do not have to be readily accessible if. Pay attention to other equipment that is (or will be) installed in the same room (or close to the transformer if in an open area). 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. You are using an out of date browser. Bushes in front electrical components that come under the code of readily accessible must be cut down. An AFCI is basically like a GFCI but it will protect the entire circuit from the breaker and back. Article 450 of the National Electrical Code (NEC) opens by saying, This article covers the installation of all transformers. Then it lists eight exceptions. The neutral point is the common point on a Wye-connection in a polyphase system. A voltmeter will not register a voltage when connected to the same ungrounded (hot) phase. is permitted where the voltage between conductors does not exceed 300 if: The conductors do not pass above the roof overhang for a distance of more than 1.83 m (6.0 ft), 1.22 m (4.0 ft) horizontally, and. For a better experience, please enable JavaScript in your browser before proceeding. The switch is, A: Given, The materials that do not, A: Statement 1 : A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. connected to ground or to a conductive body that extends the ground connection. Volume in boxes can be increased by using ____ rings, domed covers, extension rings, or similar items. of the box. 5. Select one: A. Enclosures are guarded against employee contact. service disconnect | Mike Holt's Forum 240.6(A) and Table 450.3(B) Note 1]. A motor disconnecting means must be located in sight from the motor location as required by 430. 5 Key Considerations for Single Family Residential Electrical - NFPA . A grounded conductor is a system or circuit conductor that is intentionally grounded. 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. 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. Figure F.1 has you start by establishing the context. continuous (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). 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. k=11k53\sum_{k=1}^{\infty} \frac{1}{\sqrt[3]{k^5}} 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. 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. Branch Circuit Multi-wire D. Although the box contains a multi-wire branch circuit, only one ungrounded (hot) conductor is feeding this duplex receptacle. 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. 28(7x2)5dx,u=7x2\int 28(7 x-2)^{-5} d x, \quad u=7 x-2 Dry-type transformers having a secondary voltage of 1,000V or less are not required to be readily accessible. The conductors from the service point to the service disconnecting means are known as service conductors. It is a system in which exchange the information between two node or points., A: Delay skew is the difference between the propagation delay on the fastest and slowest pairs in a UTP, A: Although, The performance are generally affected by the factors like lag in the compensating devices, slow response of the sys. There are a wide variety of supplementary fuses and fuse holders, which have small physical dimensions . Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. Bonding Jumper (Main) When metal parts are required to be electrically connected, a reliable conductor (Bonding Jumper) is installed, thereby guaranteeing electrical conductivity. Plenum (Space) A. 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. Which agency is responsible for the maintenance and publication of the NEC ? For each given ppp-series, identify ppp and determine whether the series converges. The standard ampere ratings for fuses include (s) _____. 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. Readily Accessible | Mike Holt's Forum 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. Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless supported by messenger wires. Over areas, other than public streets, alleys, roads, and driveways, subject to vehicular traffic other than truck traffic. Overcurrent Devices Do Not Have to Be Readily Accessible If 2023 Endeavor Business Media, LLC. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies). Clearance from ground. Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. 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. 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. 100]. Table S-4. 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 . 450.3(B)]. You are right, and the other guy is wrong. Branch Circuits. T/F. Reference 422.11(A). A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). Service A. Example: Conductors connected to switches and receptacles are accessible by a removable plate or device. The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame. 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. neutral disconnect link, 18. Overcurrent devices do not have to be readily accessible if ____. 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. 240.6(A)], the next higher rating is permitted [Sec. Broken fiberD. All 125-volt, single-phase, 15- and 20-ampere receptacles installed in bathrooms or on rooftops shall have ground-fault circuit-interrupter protection for personnel. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. Grounded (grounding) is defined as being ____. The. Mark the new location the same way the old location was marked; if the old location was not marked, clearly mark the new location using a permanent and acceptable means. Transformer top surfaces that are horizontal and readily accessible must be marked to prohibit storage on those surfaces. Transformers must be readily accessible to qualified personnel for inspection and maintenance [Sec. 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. Thus, the receptacle outlet is the endpoint of the branch circuit, and the breaker in the panel is the circuit's final OCPD. 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 . Two exceptions to the make readily accessible rule are noted in Sec. Neutral Conductor or Point A. ." Cable tester detects the, A: Materials that allow current to flow through them are called conductors. If the transformer will be set where forklifts might be present, ensure someone installs the correct protection (such as a bollard set into the floor). Ground is defined as earth. Ensure the room is vented either via door vents that cannot be blocked or (preferably) an exhaust vent to the outside. Festoon Lighting A. Festoon lighting is a string of outdoor lights suspended between two points. National Electrical Code Basics: Overcurrent Protection Part 5 Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. This prevents the equipment from being readily accessible to people in general and is a good safety measure. B. Overcurrent devices do not have to be readily accessible if ____. The word luminaire refers to . "must" or "must note penalties for noncompliance" b. shall" or "shall not suggested but discretionary ANS: PTS: Electrical Code REF: The National 10. So, what does it really cover? Meaning that if you had to get a ladder to reset this breaker, its considered accessible equipment as long as its not blocked. Special Permission AHJ Special permission is the written consent of the authority having Jurisdiction or the AHJ who enforce the NEC and grant variances in the code (building department). Mandatory rules in the NEC contain the language Which of the following would help avoid the choke effect in grounding electrode conductors?A. Circuit breakers and fuses must be readily accessible [240.24]. The Code does not completely address this issue. 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. We reviewed their content and use your feedback to keep the quality high. 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. 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.

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