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). Overhead service conductors may not be installed beneath openings through which materials may be moved, such as openings in farm and commercial buildings, and may not be installed where they will obstruct entrance to these building openings. The conductors are terminated at a through-the-roof raceway or approved support. 450.3(B)]. For a better experience, please enable JavaScript in your browser before proceeding. 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]. Electric Metal Tubing (EMT) provides protection from ____. Never set two transformers with their vents facing each other. Identify and describe the step-by-step process used to install cable in the NCT Colledge buildings? The service lateral is the underground conductors between the utility electric supply system and the service point. 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. Overcurrent devices do not have to be readily accessible if ____. The service point is the point of connection between the facilities of the serving utility and the premises wiring. 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: False. Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. I believe its not enough a little too broad. 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. Over commercial areas subject to truck traffic. Exposed runs of Type AC cable installed on the underside of joists must be supported at ____. My view is that anything that gets plugged into a receptacle outlet is not part of the premises wiring system. Overcurrent devices do not have to be readily accessible if ____. Bonding Connected to establish electrical continuity and conductivity. Overcurrent protection shall not exceed _____. The materials that do not, A: Statement 1 : Branch Circuit Appliance An appliance branch circuit supplies energy to one or more outlets for the purpose of connecting appliances. Most supplemental overcurrent protective devices have very low interrupting ratings. Signs warning of high voltage shall be posted where unqualified employees might come in contact with live parts. 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. 800A. 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. 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. . 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. 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. 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. Service Drop A. Between the three-phase line and the disconnect switch. 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. 110.25 [Sec. An intersystem bonding termination will typically be used as a ground junction for a/anA. 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. Wire connectors, pigtails, locknuts, bushings, raceway connectors, grounding screws, and equipment bonding jumpers are not factors when calculating ____. An outlet intended for the direct connection of a lampholder or luminaire is called a. lighting outlet. 1). 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. Service A. Electrical metallic tubing must not be ____. 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. Each service disconnecting means shall be suitable for the prevailing conditions. Festoon Lighting B. 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. "Readily accessible" means located so a person can reach it quickly without having to climb over (or remove) obstacles, or use a portable ladder. 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 . There was general agreement that climbing over or under something would render equipment accessible but not readily accessible. Outlet A point in a wiring system from which current is taken to supply utilization equipment is known as an outlet. , Enclosure Any case, housing, apparatus, fence, or wall surrounding an installation designed to prevent personnel from accidentally contacting energized parts to protect the equipment from physical damage serves as an enclosure. A motor disconnecting means must be located in sight from the motor location as required by 430. The given Statment B. 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. On three-phase, three-wire circuits, an overcurrent relay in the residual circuit of the current transformers may replace one of the phase relays. Clearance from ground. conducting. So, what does it really cover? Prior to the 2017 NEC, "overcurrent devices" were required to be readily accessible. 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. 4. The equivalent of ____ is the maximum allowed between pull points. A. A major concern with transformers is preventing overheating. neutral disconnect link, 18. 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 a delta-connected high voltage system is used to supply the equipment, a system neutral shall be derived. Cable tester is a device which is used to test a cable. Therefore, So a telephone occupies a circuit for, A: A circuit breaker is a kind of electrical switch which is used to protect an electrical circuit from, A: A power station is to provide electricity to a huge number of people. The full form of the acronym, MCCB, is Miniature Case Circuit Breaker. 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 . 5. The neutral conductor of a multiphase system in which one phase is used as a neutral conductor shall be grounded. A cable assembly's ____ conductor can be used as a switch loop (leg) in single-pole, three-way, and four-way switch installations, even though it is an ungrounded (hot) conductor. 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. 450.9]. 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. Branch Circuits A. LOCATED WITHIN A GROUNDED JUNCTION BOX B. Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. Other land traversed by vehicles, including land used for cultivating or grazing and forests and orchards. Accessible (Readily Accessible) Ready accessibility to wiring in luminaires is not required. 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. The neutral point is the midpoint on a single-phase portion of a 3 wire system. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). Aug 12, 2009. These circuits exclude the connection of luminaires (lights) unless they are part of the appliance being connected. An outlet intended for the direct connection of a lamp holder or luminaire is called a lighting outlet. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies). The frame of a vehicle need not be grounded and may serve as the grounding electrode for a system supplied by a generator located on the vehicle under the following conditions: The frame of the generator is bonded to the vehicle frame; The generator supplies only equipment located on the vehicle and cord- and plug-connected equipment through receptacles mounted on the vehicle; The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame; and. However, equipment that is guarded by location and isolated from ground need not be grounded. termination. 5. Selective coordination "must" or "must note penalties for noncompliance" b. shall" or "shall not suggested but discretionary ANS: PTS: Electrical Code REF: The National 10. Grounded (grounding) is defined as being ____. Each conductor intentionally grounded must have . 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. NEC identifies ____ types of rigid PVC conduit. A listener nearby in a 20^ {\circ} \mathrm {C} 20C room hears a note with a wavelength of 40 cm. 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. The system complies with all other provisions of paragraph (g) of this section. 240.6(A)]. Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____. Branch Circuit Multi-wire D. Although the box contains a multi-wire branch circuit, only one ungrounded (hot) conductor is feeding this duplex receptacle. 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 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. 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. A reduction in clearance above only the overhanging portion of the roof to not less than 457 mm (18 in.) A compartment or chamber having one or more attached air ducts and forming the distribution system is known as a plenum. Bonding Jumper (Main) When metal parts are required to be electrically connected, a reliable conductor (Bonding Jumper) is installed, thereby guaranteeing electrical conductivity. patient care area.B. Cable installed under a building must be ____ unless the wiring method is Type MC or Type MI cable that is identified for direct burial. = 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) Is other equipment in there? Verified Answer for the question: [Solved] Overcurrent devices do not have to be readily accessible if ____. What else can you see that might impinge upon a safe and reliable installation? 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. According to Note 1 of Table 450.3(B), transformers having a primary current rating of 9A or more are permitted to use the next size up rule when 125% of the primary current doesnt correspond to the standard rating of a fuse or nonadjustable circuit breaker listed in Sec. Thus, for voltages higher, A: 12. Above finished grade or sidewalks, or from any platform or projection from which they might be reached. white, gray, green, or, green with yellow stripe(s). 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.) The record shall be made available on the jobsite for inspection by the Assistant Secretary and any affected employee. They cant be attached to any fire escape, downspout or plumbing equipment. 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. Thus, you do not create a new branch circuit. This receptacle is fed from a multi-wire branch circuit. Notwithstanding the provisions of paragraph (g)(6)(vi) of this section, the following equipment need not be grounded: Tools likely to be used in wet and conductive locations if supplied through an isolating transformer with an ungrounded secondary of not over 50 volts; and.
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