overcurrent devices do not have to be readily accessible if
The conductor must be sized to accommodate the 70A primary overcurrent protection per Sec. Not be located where they will be in the . Office lighting is an example of a continuous load. 800A. As shown in Figure 5, the electrical . 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. Different customers power, A: AWG or American Wire Gauge is the US standard measure for the diameter of electrical conductors. Bushes in front electrical components that come under the code of readily accessible must be cut down. Broken connectors in a cable linkB. If that is right, then the in-line fuse (whether or not rated as a branch circuit OCPD) does not establish the beginning of a branch circuit, and the wires upstream (i.e., up to the receptacle, and from the receptacle back to the panel) have not been re-designated as a feeder. The neutral point is the common point on a Wye-connection in a polyphase system. Handles or levers of circuit breakers, and similar parts that may move suddenly in such a way that persons in the vicinity are likely to be injured by being struck by them, shall be guarded or isolated. However, conductors that run above the top level of a window may be less than 914 mm (3.0 ft) from the window. Much of what weve discussed here isnt explicitly required by the NEC. Primary Conductor = 6 AWG conductor rated 65A at 75C [Sec. Appliance Utilization equipment of a commonly built-in standard, installed as a unit such as AC, or a stove. 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. IMO 422.11 (E) 3 permits him to do this WITHOUT the fuse. 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. 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. Grounding Triad is the term which is missing in NATIONAL, A: Eachtelephone makes 0.5 calls/hour at 5 minutes. Plenum (Space) A. Bonding means that everything is connected or conductivity of the electron through wires. 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. Where connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. (B) Suspended Ceilings. = 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) Fitting A. 100]. A system conductor that is required to be grounded by the provisions of paragraph (g)(2) of this section shall be bonded to the generator frame where the generator is a component of a separately derived system. 4. A voltmeter will not register a voltage when connected to the same ungrounded (hot) phase. Ensure the room is vented either via door vents that cannot be blocked or (preferably) an exhaust vent to the outside. 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. It has no direct connection from circuit conductors. The conductors are terminated at a through-the-roof raceway or approved support. Overcurrent devices do not have to be readily accessible if ____. 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. Wiring components are considered accessible if, Accessible learning experience design and implementation, Has virtual functions and accessible non-virtual destructor, Examples of accessible instructional materials. A. Vertical clearance of final spans above, or within 914 mm (3.0 ft) measured horizontally of, platforms, projections, or surfaces from which they might be reached shall be maintained in accordance with paragraph (c)(2) of this section. "Readily accessible" means located so a person can reach it quickly without having to climb over (or remove) obstacles, or use a portable ladder. We will hit the highlights here, the first being that the overcurrent devices have to be readily accessible and shall be installed so that the center of the grip of the operating handle is not more than 6 feet 7 inches in its highest position from the floor or working platform. 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. 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. 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. 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 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. Rigid metal conduit (RMC) is a raceway of ____. A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). To catch up on Lorenzo Mari's series on Overcurrent Protection, please visit: National Electrical Code Basics: Overcurrent Protection Part 1 . Power conductors below communication conductors -- 762 mm (30 in. These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. If you can move this dresser, and it has a cover plate its accessible. as is. Install the service disconnecting means at a readily accessible location. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). 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. There was general agreement that climbing over or under something would render equipment accessible but not readily accessible. The service lateral is the underground conductors between the utility electric supply system and the service point. Dont install a transformer with the vent facing a distribution panel, cable rack, or other equipment that needs cool air. Replacement of receptacles shall comply with the following requirements: Where a grounding means exists in the receptacle enclosure or a grounding conductor is installed, grounding-type receptacles shall be used and shall be connected to the grounding means or conductor; Ground-fault circuit-interrupter protected receptacles shall be provided where replacements are made at receptacle outlets that are required to be so protected elsewhere in this subpart; and. Proper transformer selection is an important part of preventing transformers from overheating. Applying solder to the connectionD. Separately Derived System B. 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. Exposed noncurrent-carrying metal parts of fixed equipment that may become energized shall be grounded under any of the following conditions: If within 2.44 m (8 ft) vertically or 1.52 m (5 ft) horizontally of ground or grounded metal objects and subject to employee contact; If located in a wet or damp location and not isolated; If supplied by a metal-clad, metal-sheathed, or grounded metal raceway wiring method; or. 450.3(B)]. 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. 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 . 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. Decreased bending radius during operation, Which of the following is a term missing from the National Electrical Code but used by manufacturers of equipment that's suitable for use as service equipment? Exposed runs of Type AC cable installed on the underside of joists must be supported at ____. Main panel, Branch Circuit Multi-wire E. There must be only one grounded neutral conductor, and there must be an equal voltage between it and each undergrounded conductor of the circuit. D. THE DISCONNECTING MEANS IS READILY ACCESSIBLE. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. Two exceptions to the make readily accessible rule are noted in Sec. The word luminaire refers to . A wire, bus, screw, or similar suitable conductor is acceptable as a main bonding. The service disconnecting means shall be installed at a readily accessible location either outside of a building or structure or inside nearest the point of entrance of the service conductors. 225.40 Wiring and Protection, Access to Overcurrent Protective Devices. of the box. Selecting the next higher standard size overcurrent protective device is NOT allowed. They are fire-alarm circuits having a maximum current of 0.030 amperes; AC circuits of less than 50 volts shall be grounded if they are installed as overhead conductors outside of buildings or if they are supplied by transformers and the transformer primary supply system is ungrounded or exceeds 150 volts to ground; AC systems of 50 volts to 1000 volts shall be grounded under any of the following conditions, unless exempted by paragraph (g)(1)(v) of this section: If the system can be so grounded that the maximum voltage to ground on the ungrounded conductors does not exceed 150 volts; If the system is nominally rated three-phase, four-wire wye connected in which the neutral is used as a circuit conductor; If the system is nominally rated three-phase, four-wire delta connected in which the midpoint of one phase is used as a circuit conductor; or. Indicate your answer where indicated. Service Point A. Ducts used to transport dust, loose stock, or flammable vapors shall not contain ____ of any type. A major concern with transformers is preventing overheating. What can installation records be used to determine while servicing equipment?A. Common Overcurrent Protection Devices (OCPDs) An overcurrent protection device (OCPD) is a piece of electrical equipment used to protect service, feeder, and branch circuits and equipment from excess current by interrupting the flow of current. Is this in a room with an inswing door? maximum fuse or circuit breaker size =, 4.a. 450.10(A)]. 240.4(B). Branch Circuit Appliance An appliance branch circuit supplies energy to one or more outlets for the purpose of connecting appliances. The standard ampere ratings for fuses include (s) _____. Receptacle outlets shall comply with the following provisions: A single receptacle installed on an individual branch circuit shall have an ampere rating of not less than that of the branch circuit; Where connected to a branch circuit supplying two or more receptacles or outlets, a receptacle may not supply a total cord- and plug-connected load in excess of the maximum specified in Table S-4; and. You will have to check the listing of the fuse and fuse holder. Never set two transformers with their vents facing each other. Electrical metallic tubing must not be ____. . Cable tester is a device which is used to test a cable. NEC 2008 article 100 definitions. Installing a main bonding jumperB. A. communications system installation.C. 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. 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. 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. 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. Then we have: VII. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. A) located within a grounded junction box B) the disconnecting means is readily accessible C) the total load of the adjacent circuit does not exceed local standards D) located adjacent to the equipment where access is achieved by the use of portable means Start your trial now! Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. Basically, ______receptacles are required to be installed if an equipment grounding conductor is available at the outlet where the receptacle is located. Cable tester detects the, A: Materials that allow current to flow through them are called conductors. Bonding Jumper (Main) An Equipment bonding jumper is the connection between two or more portions of the equipment grounding conductor. A: Article 406 of NEC covers the installation of receptacles of both grounded type and non-grounded, A: According to the question we need to Identify and Identify and describe the step-by-step process, A: All components of a photovoltaic system other than the solar panels are included in the balance of, A: Fiber optics is a technology that is connected with the transmission of information as light rays, A: Please find your answer below in step 2, A: Bartleby has policy to solve only first question and if it has subparts then solve only first 3, A: Pin encasings become excessively cumbersome an uneconomical past 33 kV. IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. above the floor or working platform, unless one of the following applies: main bonding jumper Problems due to aging during operationC. , which is used indirectly or directly on electrical installations. white, gray, green, or, green with yellow stripe(s). Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____. Always install transformers per the manufacturers instructions and ensure transformer ventilating openings are not blocked by walls or other obstructions [Sec. A grounding electrode is a(n) ____ object that establishes a direct connection to earth. Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in Table S-5; or, where larger than 50 amperes, the receptacle rating may not be less than the branch-circuit rating. four-wire, three-phaseB. The weight supported by any single conduit shall not exceed ____ pounds. Cord connections. Accessible (Readily Accessible) Readily accessible means capable of being reached quickly without have to climb or remove obstacles. A: The solution is provided in the following section: A: Cable Tester- Branch Circuits A. patient care area.B. Listed or labeled portable tools and appliances if protected by an approved system of double insulation, or its equivalent, and distinctively marked. 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. Raceway containing branch circuit conductors in concrete, Conduit Body A conduit body is a separate portion of a conduit (tubing) system providing access to the interior of the system through a removable cover at a junction. Dry-type transformers having a secondary voltage of 1,000V or less are not required to be readily accessible. For example, most of the general tips for setting it in place are not found in the NEC. Is other equipment in there? , 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. Branch Circuit Multi-wire D. Although the box contains a multi-wire branch circuit, only one ungrounded (hot) conductor is feeding this duplex receptacle. The biggest hang up we had was the use of the word "obstacle." 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). luminaire. 450.13]. 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. 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. What might block airflow? 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. Using bonding bushes on the ends of the raceway, Four 4 AWG copper conductors with THHN insulation installed in EMT in a basement. LOCATED WITHIN A GROUNDED JUNCTION BOX, B. 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. Cables running horizontally (or diagonally) are considered supported and secured when passing through a(n) ____. Conductors: With junction boxes of recessed luminaires can be accessed by removing part of the luminaire. 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 A circuit breaker with a straight voltage rating, such as 240 V or 480 V, may only be installed in a circuit in which the nominal voltage between any two conductors does not exceed the circuit breaker's voltage rating. A: The correct option along with the explanation is provided in the following section. 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. Example: Conductors connected to switches and receptacles are accessible by a removable plate or device. just for the sake of argument, if this guy puts an inline fuse at a 'j box'(its above the ceiling) that is just before the receptacle outlet, then is the point from the j box to the out let of the receptacle the 'branch circuit'?? 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. A: According to the question, we need to explain the types of cables for data communication. four-wire, single-phase. continuous 1. contiguous. JavaScript is disabled. Overcurrent devices do not have to be readily accessible if ____. A fitting is an accessory, such as a locknut or bushing, whose function is primarily mechanical, rather than electrical in nature. 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. Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. Branch circuits are divided into four categories: Appliance, General purpose, Individual, and Multi-wire. 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. ___ are permitted inside conduit bodies, if the manufacturer durably and legibly marked the cubic inch capacity on the conduit body. continuous. 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. Grounded Conductor Cont B. Verified questions. IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. National Association of Electrical Engineers (NAEE b. 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. It can apply to industrial motor as well that run facilities, Device A unit of an electrical system that carries or controls electrical energy as its principal function is known as a device. Many inline fuses are not suitable for use as a branch circuit OCPD.
