2003-2023 Chegg Inc. All rights reserved. . This site also provides answer keys to the NJATC fundamentals workbook as well as the motors, instrumentation and orientation workbooks. This represents the conductor length in a 3 phase circuit. The K value for copper and aluminum is what? what is the formula for KW in a 3 phase circuit when the voltage and current is known? 220.14 (J) Unit load for dwelling units = 3 VA per ft.2 Lighting load = Area unit load = 16,000 3 VA per ft.2 = 48,000 VA 210.52 (B) and 220.52 (A) Small-appliance load = 2 1,500 VA = 3,000 VA 220.52 (B) in motors with higher current draws they use the nameplate, typically. . Portable or mobile signs in wet or damp locations shall be provided with a manufacturer-supplied ? We must add 3 zeros for this cross sectional number size. fastened in place. 2017 Master Electrician Exam Questions and Study Guide- Ray Holder. The 90C rating is for dry locations only. The ampere trip rating of overloads is based on the. 1 AWG Z copper This is similar to load VA/ circuit VA. What type of cord connected equipment is used to determine the number of branch circuits for multi-outlet assemblies installed in commercial, industrial, and educational locations? Make sure to remember your password. The feeder is installed underground to a remote building. The ampacities of Table 310.17 are for an ambient temperature of ? . moisture impervious metal sheathed, a type listed for wet locations, or one of the types listed in 310.10(c)(2). Identify the document that provides suggested support locations for cable tray fittings. The customer has decided to use the minimum size service. Mike Holt's Understanding the National Electrical Code, Vol. How long must a raceway be to require ampacity derate? All conductors are XHHW Copper. The correct answer is: 545.6 Exception. This is an acceptable installation according to the Code. amperes at 120/240 volts. C. 2017 Master Electrician Exam Questions and Study Guide- Ray Holder. Determine the ampacity of six 8 AWG THW copper conductors installed in EMT in an ambient temperature of 30C. The maximum number of 10 AWG THHN aluminum conductors permitted in a four-inch by 11/2-inch octagonal box by Table 314.16(A) is ? remember the linear foot calculation method for show windows is [200VAx linear ft. x 125%]/circuit VA. Calculate to the nearest ampere. Prep for a quiz or learn for fun! most terminations are rated at 60C or 75 degrees C. This type of conductor is dual rated. What must be remembered for the nuetral? 8 AWG PFAH nickel-coated copper 142 A Three 1/0 AWG XHHW-2 aluminum conductors are installed in a rigid metal conduit, Type RMC, in an ambient temperature of 105F. 100. Remember: the 1.732 or 2 represents the length of the circuit. conductors designed for wet locations must be of what three types? Electrical Code Calculations lvl 1 Lesson 1 Beginning to - Quizlet Note: 386.21 states that the number of conductors shall not be more than what the raceway was designed for. When sizing OCPD for motors, if adjustable, what should they be set at? . A 10 AWG THWN copper conductor is connected to a circuit breaker with termination temperature limitation marked (not to exceed) 60C. Code Calculations Paperback - January 1, 2011 by NJATC (Author) 17 ratings See all formats and editions Paperback $11.24 Other new and used from $7.26 National Joint Apprenticeship and Training Committee, Code Calculations, Paperback. Section 110.12(A) requires unused openings, other than those intended for the operation of equipment, those intended for mounting purposes, or those permitted as part of the design for listed equipment, to be ? The temperature correction factor portion of Table 310.15(B)(1) indicates that as the ambient temperature increases, the ampacity of the conductor increases. Free Flashcards about Code Calculations - StudyStack similar to the resistive or single phase calculation where P/E=I. The correct answer is: 550.16(A)(1). The correct answer is: solid fixed barrier of a material compatible with the cable traybarrier of a material compatible with the cable tray, The total difference between the minimum winter and maximum summer temperatures a cable tray system may be subject to must be considered to account for thermal expansion and contraction. JavaScript seems to be disabled in your browser. 2017 Master Electrician Exam Questions and Study Guide- Ray Holder. PP59. fixed electric space heating is what type of load? Using Table 310.16, identify the correct ampacity for these insulated conductors. What minimum size THHN branch circuit conductor is required for one of the circuits when it supplies a noncontinuous load of 27 kW? Chapter 9 table 8 is where this can be found. Where different temperature limitations of individual components are applied to a single circuit, the principle of the ? then apply note 1, per note 2 of T220.55. 250 kcmil TW aluminum TX Admin Code: TITLE 22, PART 23, TX REAL ESTATE COMM. The following conductors are the same AWG size and are made up of the same copper conductor material, but have different types of insulation.

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