Example: Conductors connected to switches and receptacles are accessible by a removable plate or device. ampacity = , surrounded by a case, housing, fence, or walls and it prevents people from accidentally contacting energized parts is referred to as enclosed. Listed or labeled portable tools and appliances if protected by an approved system of double insulation, or its equivalent, and distinctively marked. 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. It has no direct connection from circuit conductors. 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. An intersystem bonding termination will typically be used as a ground junction for a/anA. 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). Multi-Outlet Assembly A. Service equipment is that equipment (circuit breaker), switches, fuses, and other that is necessary to constitute the main control and cutoff that is connected to the load end of the service conductors. 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. Based on the 2020 NEC. IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. a. 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. Overcurrent devices do not have to be readily accessible if located within anded jacobs k. the. 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. According to the definition of a branch circuit, it starts at the final overcurrent protection device. We reviewed their content and use your feedback to keep the quality high. OSHA 6.Underwriter's Laboratories NFPA TS: 1 REF: The National ANS: Electrical Code 8. Liquidtight flexible metal conduit (LFMC) is a raceway of circular cross section having a(n) ____ over an inner flexible metal core. = Accessible equipment is equipment not guarded by locked doors, elevators, or other effective means (ARTICLE 100) = Overcurrent devices do not have to be readily accessible, if located adjacent to the equipment, where access is achieved by the use of portable means [ladder] (ARTICLE 240.24(A)(4) Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. These circuits exclude the connection of luminaires (lights) unless they are part of the appliance being connected. A (n) ______ is a complete lighting unit consisting of a light. 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. 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. If a bollard will be installed, ensure there will be enough space on the bollard side of the transformer for maintenance and repair. Grounded (grounding) is defined as being ____. overcurrent devices do not have to be readily accessible if. A grounded conductor is a system or circuit conductor that is intentionally grounded. C. THE TOTAL LOAD OF THE ADJACENT CIRCUIT DOES NOT EXCEED LOCAL STANDARDS. If I understand the situation correctly (no guarantee of that! Neutral disconnect link Step 2: Determine the primary overcurrent protection rating [Sec. as is. 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. three-wire, single-phaseC. Label your diagram. Ground detectors are installed on the control system; If the system is an isolated power system that supplies circuits in health care facilities; or. A fuse is an electrical gadget used to shield the circuit from overcurrent. 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. The weight supported by any single conduit shall not exceed ____ pounds. Each conductor intentionally grounded must have . It may not display this or other websites correctly. Over areas, other than public streets, alleys, roads, and driveways, subject to vehicular traffic other than truck traffic. Article 230.70 (A)(1) (1) Readily Accessible Location. Above finished grade or sidewalks, or from any platform or projection from which they might be reached. 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. Notice the bonding jumper must be made of copper or other corrosion-resistant material. 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. The secondary conductors do not extend beyond the enclosure(s) of the enclosed channel of metal (or nonmetallic) materials, article 100 defines raceway as a(n) ____designed expressly for holding wires, cables, or busbars. Festoon Lighting B. Equipment found damaged or defective shall not be used until repaired; The following tests shall be performed on all cord sets and receptacles which are not a part of the permanent wiring of the building or structure, and cord- and plug-connected equipment required to be grounded: All equipment grounding conductors shall be tested for continuity and shall be electrically continuous; Each receptacle and attachment cap or plug shall be tested for correct attachment 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. 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. 450 only, a transformer is an individual power transformer (single- or 3-phase,)identified by a single nameplate unless otherwise indicated. Is this in a room with an inswing door? I = VA (E 1.732) I = 45,000VA (480V 1.732) I = 54A. This type of protection is not required to be readily accessible as are branch circuit devices. A grounding electrode is a(n) ____ object that establishes a direct connection to earth. Tests performed as required in paragraph (b)(3)(ii)(C) of this section shall be recorded. A wire, bus, screw, or similar suitable conductor is acceptable as a main bonding. Overcurrent devices do not have to be readily accessible if ____. Installations in any of the following categories are wet locations, underground, within concrete slabs, in masonry areas subject to saturation or liquids and in locations unprotected from weather. Then we have: VII. 450.3(B)]. Festoon Lighting C. Messenger wire(s), together with insulators is used to support conductors in all span exceeding 40 ft (12 m) in length. . Grounded (grounding) is defined as being connected to ground or to a conductive body that extends to the a ground connection. f(x)=4x+53f(x)=\sqrt{4 x+5}-3 Nonmetallic-sheathed cable passing through holes in metal framing must be protected by ____ covering all metal edges. four-wire, single-phase. Listed equipment protected by a system of double insulation, or its equivalent, and distinctively marked as such. 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. You are right, and the other guy is wrong. If you stick a fuse in a branch circuit, IMO, you have started a new branch circuit. A: The Digital OUT of the first IR Sensor is connected to Pin 11 of Arduino and the Digital OUT of the, A: The convolution theorem is used to convert a time signal into an s-domain signal when multiple, A: As stated by National Electric Code(NEC),the maximum cover of UF cable or the maximum burial depth, A: The circuit is shown below: If the circuit\'s overcurrent device exceeds _____, the conductor ampacity shall have a rating not less than the rating of the overcurrent device. 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. This can be outside the structure. Notice the language is accessible to qualified personnel. This in no way inhibits making transformers inaccessible to unqualified personnel. Many inline fuses are not suitable for use as a branch circuit OCPD. 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. Overcurrent protection for transformers not over 1,000V. A load having the maximum level of current sustained for three hours or more is referred to as a ____ load. Power conductors below communication conductors -- 762 mm (30 in. It comprises a, A: ANSWER (1) Problems due to aging during operationC. Location Dry A. A contact device installed at an outlet for the connection of an attachment plug is a receptacle. What size primary-only protection overcurrent device and conductor is required for a 45kVA, 3-phase, 480V transformer that is fully loaded? To catch up on Lorenzo Mari's series on Overcurrent Protection, please visit: National Electrical Code Basics: Overcurrent Protection Part 1 . Exterior protected locations under canopies, roofs, porches, and similar sites are considered damp locations. 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. Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____. The NEC assumes you have already selected a transformer suitable for the load characteristics. Open conductors, open multiconductor cables, and service-drop conductors of not over 600 volts, nominal, shall conform to the minimum clearances specified in Table S-6. Enclosure for a motor starter, Equipment is a general term, including fittings, devices, appliances, luminaires, apparatus, machinery, and ect. 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]. Reference 422.11(A). (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies). Note 2 to paragraph (b)(3)(ii)(A) of this section: Cord sets and devices incorporating the required ground-fault circuit-interrupter that are connected to the receptacle closest to the source of power are acceptable forms of protection. For dc circuits only, the equipment grounding conductor may be run separately from the circuit conductors. A reduction in clearance above only the overhanging portion of the roof to not less than 457 mm (18 in.) Location Damp A. Receptacles connected to circuits having different voltages, frequencies, or types of current (ac or dc) on the same premises shall be of such design that the attachment plugs used on these circuits are not interchangeable. The terminals are rated 75C (Fig. There was general agreement that climbing over or under something would render equipment accessible but not readily accessible. Note: Please do not handwritten. 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. fire protection system.D. The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame. 19. The overhead conductors between the utility electric supply and the service point. Reference 422.11(A). 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. Each service disconnecting means shall simultaneously disconnect all ungrounded conductors. This prevents the equipment from being readily accessible to people in general and is a good safety measure. 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. All rights reserved. . They can also be installed in panelboards or control boards that are in rooms or enclosures free from dampness, easily ignitable material and accessible only to qualified personnel. The definition of that word begins with, "A point on the premises wiring system. 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. 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). What can installation records be used to determine while servicing equipment?A. 250.12]. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. 240.6(A)]. Select one: A. The conductors are terminated at a through-the-roof raceway or approved support. . National Firefighters Association (NFA) Underwriter's Laboratory (UL) National Fire Protection Association (NFPA) 1 ANS: PTS: Electrical Code REF: The National 9. Power quality problems can occur because of incorrectly grounding and bonding a transformer. An ____ is the organization, office, or individual responsible for enforcing the requirements of a code. Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. You are right, and the other guy is wrong. Formal interpretations of the NEC are govered by regional construction authorities. Broken connectors in a cable linkB. A motor disconnecting means must be located in sight from the motor location as required by 430. As long as you can remove the trim and access the junction box it will be considered readily accessible! 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. Office lighting is an example of a continuous load. ." Branch Circuit Appliance An appliance branch circuit supplies energy to one or more outlets for the purpose of connecting appliances. 450.13(A) and (B): (A) Open Installations. 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. 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. Branch Circuit Multi-wire Multi-wire circuit consists of one (or more) duplex receptacles, one or more multiple receptacles single or combination. Reason, actually had a debate with a guy that was installing an 'appliance' that say maxium overcurrent rating of 15 amps. Bonding Jumper (Main) An Equipment bonding jumper is the connection between two or more portions of the equipment grounding conductor. Cables running horizontally (or diagonally) are considered supported and secured when passing through a(n) ____. For example, most of the general tips for setting it in place are not found in the NEC. 110.25 [Sec. 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. four-wire, three-phaseB. 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. 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: The correct option along with the explanation is provided in the following section. (A) Accessibility. Cable tester is a device which is used to test a cable. equipment grounding terminal bus That plug-in breaker thing is a piece of utilization equipment. Where a feeder overcurrent device is not readily accessible, branch-circuit overcurrent devices shall be installed on the load side, shall be mounted . On three-phase, three-wire circuits, an overcurrent relay in the residual circuit of the current transformers may replace one of the phase relays. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 150 V.). Basically, ______receptacles are required to be installed if an equipment grounding conductor is available at the outlet where the receptacle is located. First week only $4.99! Damp locations are those subject to moderate degrees of moisture. 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. An outlet intended for the direct connection of a lamp holder or luminaire is called a lighting outlet. 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. - Maximum Cord- and Plug-Connected Load to Receptacle, Table S-5. The switch is, A: Given, 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. Service Point A. Cables entering or exiting conduit used for support or protection against physical damage require fittings on the conduit ends to prevent ____. Installing a main bonding jumperB. Aug 12, 2009. of the box. Show FS boxes in Material PDF FS (Ferris Box Standard) FSS (Ferris Box Continuous), Continuous Load A load having the maximum level of current sustained for three hours or more is referred to as a continuous load. B. Identify and describe the step-by-step process used to install cable in the NCT Colledge buildings? What would you'all say about the installation if this sort of receptacle were used: Thanks for the responses. For each given ppp-series, identify ppp and determine whether the series converges. A heavy-duty lampholder shall have a rating of not less than 660 watts if of the admedium type and not less than 750 watts if of any other type; and. Ground is defined as earth. When asked about his responsibility to perform as thorough an investigation as possible, Miller insists that his approach is as per his inspection agreement and his SOP. Location Wet A. . 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 full form of the acronym, MCCB, is Miniature Case. 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. how to adjust cabinet shelves with plastic clips,

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