Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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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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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_forwardb) Why Generation Voltage Levels are low in the range of 11 kV/ 33 kV etc? c) Why ACSR Conductors are preferred over Copper Conductors?arrow_forwardWith respect to conductor insulation, describe the following location ratings: a. Dry b. Damp c. Wetarrow_forward
- Single core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The minimum Electric stress of the cable isarrow_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_forwardSingle core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The maximum Electric stress of the cable isarrow_forward
- A- Define Impedence. Mention the difference between Impedence and Resistance ? B- A coaxial cable's shiled diameter is 0.4cm and the inner conductor has a diameter of 0.02cm. What is the characteristic impedance of that cable? C- What is meant by impedance matching? Why is impedance matching is needed?arrow_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_forwardA two-wire DC splitter of 1Km length and resistance of each conductor (m/00030.0) and feeds the loads as shown in the augmented form: 1. Minimum voltage point on the conductor 2. The voltage at each load point 400V 200m 300m 400m 100m 80A 60A 10A SOAarrow_forward
- The minimum size raceway for the following feeder 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 insulation The minimum size raceway for the following branch circuit 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 insulationarrow_forward30. The minimum size wireway for the following feeder with parallel conductors is: a. Two sets of three, 250 kcmil conductors with XHHW insulation b. Two, 3/0 AWG conductor with XHHW insulation c. 1, 4 AWG conductor with XHHW insulation d. The conductors terminate on three power distribution blocks. Each one has a dimension of 4 in. wide and 3 in. high.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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