Essentially, this Article covers transformers supplying power and lighting loads. or greater. 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. 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. 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. Overcurrent protection for transformers not over 1,000V. Grounding-type receptacles shall be installed only on circuits of the voltage class and current for which they are rated, except as provided in Table S-4 and Table S-5. above the floor or working platform, unless one of the following applies: Where a feeder overcurrent device is not readily accessible, branch-circuit overcurrent devices shall be installed on the load side, shall be mounted . I believe its not enough a little too broad. Power conductors below communication conductors -- 762 mm (30 in. You are right, and the other guy is wrong. FLAC NEC Whi MULTIPLE CHOICE 1 Wiring components are - Chegg 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. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. Thus, you do not create a new branch circuit. You will have to check the listing of the fuse and fuse holder. Access to Overcurrent Protective Devices | UpCodes NEC NFPA 70 Flashcards | Quizlet ); Power conductors alone or above communication conductors: Communication conductors below power conductors -- same as power conductors; and. 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. A: According to the question, we need to explain the types of cables for data communication. Festoon Lighting C. Messenger wire(s), together with insulators is used to support conductors in all span exceeding 40 ft (12 m) in length. 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. Select one: A. The secondary conductors do not extend beyond the enclosure(s) of the Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder . For fire pumps, conductors may be protected for short circuit only; and. First week only $4.99! Electrical Engineering questions and answers, 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. overcurrent devices do not have to be readily accessible if A neutral conductor is defined as the conductor connected to the ____ that is intended to carry current under normal conditions. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Transformers must be readily accessible to qualified personnel for inspection and maintenance [Sec. Installing a main bonding jumperB. Nonmetallic-sheathed cable passing through holes in metal framing must be protected by ____ covering all metal edges. . Each conductor intentionally grounded must have . Type AC cable must have a bending radius at least ____ times the diameter of the cable. Branch Circuit General Purpose A general purpose branch circuit supplies two or more receptacles or outlets for lighting and appliances. Home > 2022 > June > 10 > Uncategorized > overcurrent devices do not have to be readily accessible if. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. The conductors are terminated at a through-the-roof raceway or approved support. information technology room.4.b. 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. The grounded circuit (system) conductor is generally not permitted to be used to ground, A: Amotorcontrollerisadeviceorcombinationofdevices,thatcancontrolhowanelectricmotor, A: According to question we have to discuss about A service disconnection means must be installed, A: two types of signaling mode with a neat diagram, A: With industry input, the TIA/EIA cable standards have been developed by the Telecommunications, A: According to article 702 - Optional Standby System The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame. The service point is the point of connection between the facilities of the serving utility and the premises wiring. 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 required tests shall be performed before first use; before equipment is returned to service following any repairs; before equipment is used after any incident which can be reasonably suspected to have caused damage (for example, when a cord set is run over); and at intervals not to exceed 3 months, except that cord sets and receptacles which are fixed and not exposed to damage shall be tested at intervals not exceeding 6 months; The employer shall not make available or permit the use by employees of any equipment which has not met the requirements of paragraph (b)(3)(ii)(C) of this section; and. For an ungrounded service-supplied system, the equipment grounding conductor shall be connected to the grounding electrode conductor at the service equipment. Which agency is responsible for the maintenance and publication of the NEC ? Formal interpretations of the NEC are govered by regional construction authorities. 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. 450.14] (Fig. Tests performed as required in paragraph (b)(3)(ii)(C) of this section shall be recorded. A reduction in clearance to 914 mm (3.0 ft) is permitted where the voltage between conductors does not exceed 300 and the roof has a slope of 102 mm (4 in.) Location Wet A. 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. 450.9 provides ventilation requirements, and Sec. b) Differentiate between Insulated-Neutral and Earthed-Neutral systems as applied to. Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. Nec Flashcards | Quizlet 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. Power quality problems can occur because of incorrectly grounding and bonding a transformer. Each service disconnecting means shall be suitable for the prevailing conditions. Over public streets, alleys, roads, and driveways. . 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. Over residential property and driveways. A: The solution is provided in the following section: A: Cable Tester- A major concern with transformers is preventing overheating. 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. 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. Broken connectors in a cable linkB. If you substitute installation quality for personal safety risk, you could use Figure F.1 of Informative Annex F to identify and correct potential problems with the installation. Bonding means that everything is connected or conductivity of the electron through wires. A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary. 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. continuous. The following additional requirements apply to feeders only: Conductors tapped to a feeder may be protected by the feeder overcurrent device where that overcurrent device also protects the tap conductor. IMO 422.11 (E) 3 permits him to do this WITHOUT the fuse. Figure F.1 has you start by establishing the context. 4 A through D for additional requirements. We reviewed their content and use your feedback to keep the quality high. Broken fiberD. In this example, a 70A breaker and 6 AWG conductor will meet Code requirements. A lamp holder itself is not a luminaire. Each service disconnecting means shall simultaneously disconnect all ungrounded conductors. Conduit (Junction) Box, Conduit Body B. FS, FD and larger boxes (cast or sheet metal) are not classified as conduit bodies. Liquidtight flexible metal conduit (LFMC) is a raceway of circular cross section having a(n) ____ over an inner flexible metal core. Primary Overcurrent Protection = 54A 125% = 68A; use the next size up, 70A [Sec. Illustrated Guide to the National Electrical Unit 2 test - Quizlet But you can reduce or eliminate power quality problems by correcting grounding and bonding errors at the transformer or somewhere else (e.g., at the utilization equipment). 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overcurrent devices do not have to be readily accessible if
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