Electrical Wiring Residential
19th Edition
ISBN: 9781337101837
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 10, Problem 7R
To determine
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A three-phase transmission line supplies power to three loads at a voltage
408 Vrms (line to line). The loads are as follows:
Load 1:
S₁ = 100+ j50 VA
Load 2:
S₂ = 40-j20 VA
Load 3:
S3 = 10 + j0 VA
Find the magnitude of the line current | Line and the combined power factor of
the loads.
Hint:
Steral \= √3 | Vime |× | Ime |
line
line
Can you show why the answer to this question R = 199 ohm?
2.5. Find the half-power beamwidth (HPBW) and first-null beamwidth (FNBW), in radians and degrees, for the following normalized radiation intensities: (a) U(9) cos θ cos(20) (b) U(θ)-cos2 θ cos2(26) (c) U(θ) = cos(θ) cos(30) (0 < θ < 900,0 < φ 360) (d) U(t) = cos2(9) cos2(39) (e) U(9) = cos(29) cos(39) (f) U (ecos (20) cos (30)
Chapter 10 Solutions
Electrical Wiring Residential
Ch. 10 - Prob. 1RCh. 10 - There is a 3-way switch in the bedroom hallway...Ch. 10 - What wattage was used for each vanity luminaire to...Ch. 10 - What is the current draw for the answer given in...Ch. 10 - Exposed non-current-carrying metallic parts of...Ch. 10 - What color are the faceplates in the bathrooms?...Ch. 10 - Prob. 7RCh. 10 - a. The NEC in Section _______________ requires...Ch. 10 - Hanging luminaires must be kept at least...Ch. 10 - The following is a layout of a lighting circuit...
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- Don't use ai to answer I will report you answerarrow_forwardDon't use ai to answer I will report you answerarrow_forwardA 60 Hz, 230 kV, 275 km long, uncompensated three-phase transmission line consists of three conductors bundled by phase, such that each conductor in the line is of the ACSR Falcon type. The separation between each bundled conductor is d = 45 cm and the separation between each phase of the line is 2.4 m. Calculate: "The parameters R, L, C of the line in Q2/km; µH/m and nF/m. And the total values of ZL and YC in Q and S, respectively, and in polar coordinates." Generalized constants A, B, C and D of the line, according to the type of transmission line. Present the results in rectangular coordinates. If a three-phase wye load draws 3/4 of the nominal current of the 300 MW system with FP = 0.85 lagging and at 230 kV, calculate: (a) Current at the load in KA (b) Voltage at the source in KV, (c) Current at the source in kA and (d) power at the source in MVA. Obtain the results per phase. Transmission line voltage regulation percentagearrow_forward
- Determine the required EMT size for the following combination of conductors:18. Four 8 AWG Type THW and four 12 AWG Type THW:19. Three 350 kcmil and one 250 kcmil Type XHHW conductors and a 4 AWG bare conductor:20. In a nonmetallic-sheathed (Type NM) cable installation, a 10⁄3 with equipmentgrounding conductor is installed in a metal octagonal box to supply two 12⁄2 withequipment grounding conductor branch-circuit cables. What is the minimum sizebox? The box contains internal cable clampsarrow_forwardFor problems 8 and 9, determine the correct box size for each of the following conditions:8. Two nonmetallic sheathed cables with two 12 AWG conductors, an equipment groundingconductor, and a switch in a metal box without a plaster ring.9. A raceway run serving a series of luminaires, connected to a total of three circuits. Theluminaires are supplied by 120 volts from a 3-phase, 4-wire system. Each box will containtwo circuits running through the box and a third circuit connected to a luminaire, which issupported by a luminaire stud in the box. Use 12 AWG Type THHN conductors.arrow_forward28. The minimum size raceway for the following conductors is: a. Three, 250 kcmil conductors with XHHW insulation b. One, 3⁄0 AWG conductor with XHHW insulation c. One, 4 AWG conductor with XHHW insulation29. The minimum size raceway for the following conductors is: a. Twelve, 6 AWG conductors with THHN insulation b. Nine, 8 AWG conductors with THHN insulation c. Eighteen, 10 AWG conductor with THHN insulation d. One, 10 AWG equipment grounding conductor with THHN insulation30. The minimum size wireway for the following with parallel conductors is: a. Two sets of three, 250 kcmil conductors with XHHW insulation b. Two, 3⁄0 AWG conductors with XHHW insulation c. 1, 4 AWG conductor with XHHW insulation d. The conductors terminate on three power distribution blocks. Each one has adimension of 4 in. wide and 3 in. high:arrow_forward
- box fill calculationsarrow_forwardTwo trade size 3 raceways enter a pull box directly across from each other. No other raceways enter the box. What are the minimum dimensions of the box?11. Length ______________________12. Width ______________________13. Depth ______________________Two trade size 3 raceways enter a pull box at right angles to each other. No other racewaysenter the box. What are the minimum dimensions of the box?14. Length ______________________15. Width ______________________16. Depth ______________________arrow_forwardnot use ai pleasearrow_forward
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