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2025SU ELC-119-02BL NEC Calculations
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A conduit has the following conductors installed:Two (2) phase wires and the neutral of a 4-wire, 3-phase wye-connected system.Three (3) phase conductors and the neutral of a 4-wire, 3-phase wye-connected system supplying a nonlinear load.Based upon the total number of current-carrying conductors, the allowable ampacity of each conductor as determined in 310.15.C.1 in 2022 NEC must be adjusted by:
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When will a conductor with type USE-2 insulation have an operating temperature of 90 Degrees C?I. when used in dry and wet locations II. when used in wet locations only
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Where only (2) two conductors are installed in a conduit or tubing, the total cross-sectional area of the conductors are not to exceed ______________ the cross-sectional area of the conduit.
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What is the correction factor for an Aluminum conductor type SIS when installed in a 130-degree F ambient room?
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Where bare or covered conductors are used with insulated conductors, the temperature rating of the bare or covered conductor shall be __________________ for the purpose of determining its ampacity.
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The maximum number of #10 THW conductors that can be installed in a 1 inch EMT conduit is:
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Circuit conductors shall be permitted to connected in parallel (electrically joined at both ends) only in sizes 1/0 and ____ where installed in accordance with 310.(H)(2) through (H)(6).
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Each of (8) current-carrying, single insulated, type THW, # 4 Copper conductors in a raceway installed in an ambient temperature of 42 degrees C would have a maximum allowable ampacity of:
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NEC 334.80 requires that NM cables that are bundled together and pass through wood framing members and are fire-caulked, the allowable ampacity of each conductor must be adjusted. What would be the adjusted ampacity of the individual conductors of four 12-2 wg NM cables?
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Unless specifically required in specific parts of the NEC, what is the maximum size solid conductor permitted to be installed in a raceway? Hint: Article 310 covers Conductors for General Wiring and has multiple tables involving ampacities, properties and sizes of conductors)
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