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2025SU ELC-119-02BL NEC Calculations
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A conduit has the following conductors installed:One (1) phase wire 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 Table 310.15(C)(1) AND {Table 310-16 } must be adjusted by:
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This pull box is to enclose conductors larger than #6 AWG. What is the minimum size pull box that can be used for this installation?
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The minimum length for this pull box enclosing conductors larger than #6 AWG shal be:
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The 4" conduits of this pull box are to enclose the same conductors What is the minimum distance ("C") that shall be maintained between these raceway entries?
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Each yoke or strap containing one or more devices or equipment in a device box counts as ____ conductors.
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A square box 4" X 2 1/8" has been installed with cable clamps, two (2) fixture studs and one (1) hickey. What is the maximum number of #12 AWG conductors now allowed to be pulled into this box?
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A set of 4/0 feeder conductors enter a panelboard from the bottom and terminate on the single wire lugs of a horizontally mounted circuit breaker. The minimum wire bending space to be maintained between the breaker terminals for these conductors and the cabinet wall would be:
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A device box contains the following:Two (2) 14-3 w/g nonmetallic sheathed cablesTwo (2) 3-way swithes (connected to #14 AWG wire)Two (2) 12-2 w/g nonmetallic sheathed cablesOne (1) Duplex receptacle (connected to #12 AWG wire)Four (4) Cable clampsWhat is the minimum cubic volume required for this box?
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A 4 X 2 1/8 inch square box has a 3.3 cubic inch plaster ring attached. The conduit serves as the equipment ground and the box contains the following: Four (4) #12 AWG THHN solid conductors terminating in the boxOne (1) Duplex receptacle attached to the above conductorsTwo #12 AWG THHN stranded conductors passing through the box How many more #12 AWG conductors are permitted to be added to this box?
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A 12 AWG copper conductor requires ____ cubic inch free space within a device box.
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