The conductor must be sized to accommodate the 70A primary overcurrent protection per Sec. 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. ___ are permitted inside conduit bodies, if the manufacturer durably and legibly marked the cubic inch capacity on the conduit body. Find the preimage of www for the linear transformation. The secondary conductors do not extend beyond the enclosure(s) of the 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. That plug-in breaker thing is a piece of utilization equipment. Then we have: VII. 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. 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. 4 A through D for additional requirements. Label your diagram. Over public streets, alleys, roads, and driveways. Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. I believe its not enough a little too broad. "must" or "must note penalties for noncompliance" b. shall" or "shall not suggested but discretionary ANS: PTS: Electrical Code REF: The National 10. For a better experience, please enable JavaScript in your browser before proceeding. 450.14] (Fig. - Receptacle Ratings for Various Size Circuits. 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 that same definition, the branch circuit ends at an outlet. A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary. A receptacle outlet shall be installed wherever flexible cords with attachment plugs are used. , which is used indirectly or directly on electrical installations. If you stick a fuse in a branch circuit, IMO, you have started a new branch circuit. Thus, the receptacle outlet is the endpoint of the branch circuit, and the breaker in the panel is the circuit's final OCPD. 4. The given Statment f(x)=4x+53f(x)=\sqrt{4 x+5}-3 As shown in Figure 5, the electrical . 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. 19. Grounding Triad is the term which is missing in NATIONAL, A: Eachtelephone makes 0.5 calls/hour at 5 minutes. The terminals are rated 75C (Fig. Branch Circuit Individual An individual branch circuit supplies only one piece of utilization equipment. 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. three-wire, three-phaseD. B. For example, most of the general tips for setting it in place are not found in the NEC. Verified questions. The biggest hang up we had was the use of the word "obstacle." The frame of a portable generator need not be grounded and may serve as the grounding electrode for a system supplied by the generator under the following conditions: The generator supplies only equipment mounted on the generator or cord- and plug-connected equipment through receptacles mounted on the generator, or both; and. Clearance from ground. Which of the following would help avoid the choke effect in grounding electrode conductors?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. Applying solder to the connectionD. Noncurrent-carrying metal parts of fixed equipment, if required to be grounded by this subpart, shall be grounded by an equipment grounding conductor that is contained within the same raceway, cable, or cord, or runs with or encloses the circuit conductors. The performance are generally affected by the factors like lag in the compensating devices, slow response of the sys. Overcurrent devices do not have to be readily accessible if ____. 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. Part I contains the general requirements (such as guarding, marking, and accessibility), and Part II contains requirements for specific types of transformers. Appliance Utilization equipment of a commonly built-in standard, installed as a unit such as AC, or a stove. All noncurrent-carrying metal parts of portable equipment and fixed equipment, including their associated fences, housings, enclosures, and supporting structures, shall be grounded. Where a grounding means does not exist in the receptacle enclosure, the installation shall comply with one of the following provisions: A nongrounding-type receptacle may be replaced with another nongrounding-type receptacle; or. 3. Which agency is responsible for the maintenance and publication of the NEC ? Where connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. This type of protection is not required to be readily accessible as are branch circuit devices. Outlet A point in a wiring system from which current is taken to supply utilization equipment is known as an outlet. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. The supply systems for sensitive electronic equipment are _______ systems.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. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. 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. 450.9]. Systems supplying portable or mobile high voltage equipment, other than substations installed on a temporary basis, shall comply with the following: The system shall have its neutral grounded through an impedance. In this example, the receptacle is that outlet. You are right, and the other guy is wrong. Bonding means that everything is connected or conductivity of the electron through wires. 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Metal enclosures for conductors added to existing installations of open wire, knob-and-tube wiring, and nonmetallic-sheathed cable need not be grounded if all of the following conditions are met: Runs are less than 7.62 meters (25.0 ft); Enclosures are free from probable contact with ground, grounded metal, metal laths, or other conductive materials; and. A feeder consists of all circuit conductors located between the service equipment, the source of a separately derived system, or other power supply source and the final branchcircuit overcurrent device. in 305 mm (12 in.) A grounding electrode is a(n) ____ object that establishes a direct connection to earth. 110.25 [Sec. Receptacle A. 240.6(A) and Table 450.3(B) Note 1]. Festoon Lighting C. Messenger wire(s), together with insulators is used to support conductors in all span exceeding 40 ft (12 m) in length. Identify each wire with a proper terminal marking, as shown in the example, above the disconnect switch. . 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. A transformer must have a disconnect within sight of the transformer unless the disconnect location is field marked on the transformer, and the disconnect is capable of being locked in the open position per Sec. Overcurrent devices do not have to be readily accessible if ____. patient care area.B. Each service disconnecting means shall be suitable for the prevailing conditions. The equivalent of ____ is the maximum allowed between pull points. A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). 4. 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. Overcurrent devices shall be readily accessible and shall be 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 2.0 m (6 ft 7 in.) So, if the transformer vents face a beam-mounted or wall-mounted fire extinguisher, remove the extinguisher and remount it on something that is out of the vent exhaust path. It comprises a, A: ANSWER (1) Ensure the room is vented either via door vents that cannot be blocked or (preferably) an exhaust vent to the outside. Electric Metal Tubing (EMT) provides protection from ____. An intersystem bonding termination will typically be used as a ground junction for a/anA. Just as any other overcurrent protective device . Primary Overcurrent Protection = 54A 125% = 68A; use the next size up, 70A [Sec. The service lateral is the underground conductors between the utility electric supply system and the service point. 450.13 contains accessibility requirements. 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. ." (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). 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. 225.40 Wiring and Protection, Access to Overcurrent Protective Devices. 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. All 3-wire dc systems shall have their neutral conductor grounded; Two-wire dc systems operating at over 50 volts through 300 volts between conductors shall be grounded unless: They supply only industrial equipment in limited areas and are equipped with a ground detector; They are rectifier-derived from an ac system complying with paragraphs (g)(1)(iii), (g)(1)(iv), and (g)(1)(v) of this section; or. Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. white, gray, green, or, green with yellow stripe(s). Note: Please do not handwritten. The in-line fuse holder is not an outlet, because it is not part of the premises wiring system. Generally, ungrounded (hot) conductors can be any color except ____. 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.

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