Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. 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. Where flexible cords are permitted to be permanently connected, receptacles may be omitted. overcurrent devices do not have to be readily accessible if Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. located adjacent to the equipment where access is achieved by the use of portable means. ." The overcurrent devices shall be readily accessible to the tenants they serve -- at anytime the tenant will be able to access the OCD quickley, without hinderance of locked doors in which they do not have keys -- If the tenant can freely walk to the OCD for access then you are good -- I am also assuming the tenant has permanate provisions for cooking in their unit. 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. Readily accessible We recently had a spirited discussion on the job about the term "readily accessible" and what that really means in the NEC. 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]. Service Lateral A. What is different about table 250.122 versus the other tables we have been using is that it is based on the rating of the overcurrent device, often a circuit breaker of fuse, that is ahead of the circuit that could cause the system to become energized. Accessible (Readily Accessible) Ready accessibility to wiring in luminaires is not required. An outlet intended for the direct connection of a lamp holder or luminaire is called a lighting outlet. You dont want a person standing in the transformer vent path to reach a fire extinguisher. 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. 2023 Endeavor Business Media, LLC. Between the three-phase line and the disconnect switch. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. The neutral conductor of a multiphase system in which one phase is used as a neutral conductor shall be grounded. 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. 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. Note: Please do not handwritten. Broken fiberD. 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. National Electrical Code Basics: Overcurrent Protection Part 5 1. contiguous. There are a wide variety of supplementary fuses and fuse holders, which have small physical . 240.6(A)]. Note 1 of Table 450.3(B) says that if 125% of the primary current does not correspond to a standard rating of an overcurrent protective device [Sec. However, receptacles of cord- and plug-connected arc welders may have ampere ratings not less than the minimum branch-circuit conductor ampacity. 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. 800A. Dont install a transformer with the vent facing a distribution panel, cable rack, or other equipment that needs cool air. The article 100 definition of a branch circuit ends at an outlet. Volume in boxes can be increased by using ____ rings, domed covers, extension rings, or similar items. 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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. A. . 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 tab has been removed to allow separate feeds of each outlet. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. A ceiling receptacle installed is not readily accessible, and it must have a ground-fault interrupter (GFCI). Draw clearly, neatly, and properly the Circuit Schematic Diagram for a SINGLE BUSBAR SYSTEM with BUS SECTIONALIZATION. Texas Electrical Code 2020 > 2 Wiring and Protection > 225 Outside Branch Circuits and Feeders . The maximum number of conductors applies only if the box does not contain any ____. #10. steve66 said: According to the definition of a branch circuit, it starts at the final overcurrent protection device. 1910.306 - Occupational Safety and Health Administration Check The Knowledge False Not readily accessible means you dont have to worry about it at all or ever have to service it? 110.25 [Sec. Over areas, other than public streets, alleys, roads, and driveways, subject to vehicular traffic other than truck traffic.