Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 10, Problem 4PP
Eight 10 AWG aluminum conductors with Type THWN insulation are installed in a single conduit. What is the maximum current-carrying capacity of these conductors? Assume an ambient temperature of
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A set of conductors is used to supply residential unit with a total load current of 60 A at a single-phase supply voltage of 230 V. What would be the minimum size of the conductor to be used to achieve at least 5% voltage drop? The total conductor length is 300 ft.
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What is the rated amps city per phase for six No. 3 THHN copper current-carrying conductors with two conductors per phase (parallel) and all conductors installed in the same conduit
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Chapter 10 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 10 - What is the maximum temperature rating of Type...Ch. 10 - 2. Name two types of conductor insulation designed...Ch. 10 - A 10 AWG copper conductor with Type THW insulation...Ch. 10 - 4. Six 1/0 aluminum conductors are to be run in a...Ch. 10 - Name five conditions that must be met for running...Ch. 10 - What is the largest solid (nonstranded) conductor...Ch. 10 - Can Type TW cable be used in an area that has an...Ch. 10 - How is the grounded conductor in a flat...Ch. 10 - What three colors are ungrounded conductors not...Ch. 10 - Twenty-five 12 AWG copper conductors are run in...
Ch. 10 - A single-hase load is located 2800 ft from its...Ch. 10 - It is decided to use parallel 0000 conductors to...Ch. 10 - A three-phase motor operates on 480 V and is...Ch. 10 - You have been hired by a company to connect an...Ch. 10 - 2. You are a journeyman electrician in an...Ch. 10 - You are an electrician working in an industrial...Ch. 10 - Using the above example, determine the wire size...Ch. 10 - 1. A 2 AWG copper conductor is 450 ft long. What...Ch. 10 - 2. An 8 AWG conductor is 500 ft long and has a...Ch. 10 - 3. Three 500-kcmil copper conductors with Type RHH...Ch. 10 - 4. Eight 10 AWG aluminum conductors with Type THWN...Ch. 10 - 5. A three-phase motor is connected to 480 V and...Ch. 10 - 6. A 50-hp DC motor is connected to 250 volts. The...Ch. 10 - 7. A bank of electric heaters has a power rating...Ch. 10 - A 15-hp squirrel-cage induction motor is connected...Ch. 10 - Determine the resistance of a 16 AWG copper...Ch. 10 - Determine the ohms-per-mil-foot of an aluminum...
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- 3. The three bus-bar conductors in an outdoor sub-station are supplied by units ofpost insulators. Each unit consists of a stack of 3-pin insulators fixed one on the top of the other. The voltage across the lowest insulator is 8-45 kV and that across the next is 7-25 kV. Find the bus-bar voltage of the station. [38-8 kV]arrow_forwardWith respect to conductor insulation, describe the following location ratings: a. Dry b. Damp c. Wetarrow_forwardFour No. 12 and four No. 10 conductors are to be installed in a EMT conduit 600 V jacketed. What size EMT conduit is required if a. The conductors are Type T90 Nylon? b. The conductors are Type RW90?arrow_forward
- V4arrow_forwardMost residential general lighting circuits are wired with 14-AWG copper conductors and are protected by 15-amp circuit breakers. However, there are many electricians who install 12-AWG copper conductors and protect them with 20-amp circuit breakers. How will you know which conductor size and which circuit breaker size will be used for the general lighting branch circuits in the house you are wiring?arrow_forwardANSWER THE FIRST QUESTIONarrow_forward
- What is the voltage rating of the conductors in Type NMC cable? _______________arrow_forwardThe Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft at 20C and a 60-Hz resistance of 0.0956 ohm per mile at 50C for the all-aluminum Marigold conductor, which has 61 strands and whose size is 1113 kcmil. Assuming an increase in resistance of 2 for spiraling, calculate and verify the dc resistance. Then calculate the dc resistance at 50C, and determine the percentage increase due to skin effect.arrow_forwardDefine service-drop conductors.arrow_forward
- What are the colors of the conductors in nonmetallic-sheathed cable for a. 2-wire cable? _______________, _______________ b. 3-wire cable? _______________, _______________, _______________arrow_forwardDetermine the GMR of each of the unconventional stranded conductors shown in Figure 4.30. All strands have the same radius r.arrow_forwardConductors with a -2 insulation designation have a (higher) (lower) ampacity in a wet location than do conductors without the designation. For the same size of conductor, aluminum conductors have a (higher) (lower) ampacity then do copper conductors.arrow_forward
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