Given: 1 - EMT, with 3-250 kcm il copper THW feeder conductors and 1-4 AWG THWN copper ground. What is the total cross -section area of all the conductors? Oa.0.0824 inches squared b.0.4596 inches squared Oc.1.3788 inches squared d. 1.4612 inches squared
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- What size ungrounded conductors do we need for the 60 amp load? All conductors have typeTHHN insulation.State the main constituent elements of electrical cables, as well as the materials from which they may be made. Describe the following designations: H05VV-U 1G4 mm? and LSXAV 3x16 mm?.20. What is the maximum operating temperature of type THWN conductor? a. 750C b. 900C c. 700C d. 1100C
- Figure Q1(a) shows a piece of ferromagnetic core with magnetic flux (B) with circular current (I) around the core. Figure Q1(b) show laminated ferromagnetic core with the same magnetic flux (B) and circular currents. With the aid of diagrams, explain how the current as highlighted in red (I) is developed in the ferromagnetic core in Figure Q1(a). B (a) (b) Figure 1(a) A ferromagnetic core and (b) laminated ferromagnetic coreIf the cross sectional area of a conductor is doubled, then the resistance of the conductor remains the same. becomes half of the initial value. becomes double the initial value. becomes four times the initial value.An over head string has 4 insulators. The voltage between the steel pin of the second insulator and metal cap of the fourth insulator is represent by *
- temperature rating that a conductor must have and still have 69 Ambient Tempere 4. The ampacity of 15 current-carrying 10 RHW aluminum conduc- tors in a raceway in an ambient temperature of 75'F is 1. gon factor for conductor ampacity in this location is (a) 12A (b) 15A (c) 22A (d) 30A 0.71 b0.82 0.88 0.96 5. Ain) uous load if the ambient temperature is 75°F and there are nine THHN conductor is required for a 19.70A noncontin- ne ambient temperature is 71"C, the minimum insulation current-carrying conductors in the raceway in a dry location. he capacity to carry current is (a) 14 (b) 12 (c) 10 A 60°C AI 90°C 105°C (d) 8 0 120°C 6. 6.11 Ampacity Adjustment [310.15(B)(3)(a)] The ampacity for each of nine current-carrying 10 THW conduc- tors installed in a 20 in. long raceway is 1 The ampacity of six current-carrying 4/0 XHHW aluminum con- ductors installed in a ground floor slab (wet location) is (a) 25A (b) 30A (c) 35A (d) 40A a) 135A 0) 144A (e) 185A 4 210AHow many holes are there in a conductor?Please select one:a.Same number as free electronicsb.Only those produced with thermal energyc.Manyd.NoneA copper conductor is connected in parallel with twice its length of aluminum conductor. The resistivity of copper is (0.0159 µN. m) and that of aluminum is (0.0254 uN. m). If the diameter of the aluminum is (10 mm). Determine the necessary diameter of the copper conductor in order that each conductor will carry the same current.