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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How many 14 AWG THHN conductors, including an equipment grounding conductor, can be installed in a 3/8-in. flexible metal conduit using inside fittings?
Select one:
A. 2
B. 6
C. 4
D. 8
1) What is the allowable ampacity of a single #2 THHN conductor that is installed in a conduit with eight total current-carrying conductors? Assume the conduit is located on the roof (1/4” above the roof) in Nebraska (maximum ambient temperature is 42 degrees Celsius).
2) What is the allowable ampacity of a #8 AWG TW conductor installed in a dry location with an ambient temperature of 52 degrees Fahrenheit?.
What is the minimum-size supply-side bonding jumper required if installed on the line side of a 300-ampere service disconnecting means if the service conductors are sized at 400-kcmil copper? a) 3 AWG copper b) 2 AWG copper c) 1/0 AWG copper d) Parallel 2 AWG copper conductors
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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- 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 conduitarrow_forward1. The engineering calculations for an 800-ampere service-entrance call for two 500 kcmilcopper conductors per phase connected in parallel. The neutral conductor calculations show that the neutral conductors need only be 3 AWG copper conductors. Theriser diagram shows two rigid metal conduits, each containing three 500 kcmil phaseconductors and one 1/0 AWG neutral conductor. Why is the neutral conductor sized asa 1/0 AWG, or is this a mistake?arrow_forwardWhat is the maximum ampacity of a #8 copper conductor in a conduit with type THWN insulation used in an area with an ambient temperature of 50 degrees C?arrow_forward
- n an ungrounded electrical systems with conductors installed in grounded metal raceways and enclosures, what is the voltage from the current carrying conductors to the metal raceways and WHY?arrow_forwardAssuming copper, standard wire type, and normal temperature rating, what is the typical conductor size (in awg) for a 60A service in the U.S.?arrow_forward14. If the total circular mil area of the largest ungrounded service-entrance conductor for a service is 2000-kcmil copper, what is the minimum size required for a wire-type main bonding jumper for the service? a) 4/0 AWG copper b) 250-kcmil copper c) 350-kcmil copper d) 500-kcmil copper 15. The minimum-size grounded conductor for a service supplied by a grounded system shall not be smaller than the minimum size required for a(n)______. a) Equipment grounding conductor b) System bonding jumper c) Ungrounded conductor d) Grounding-electrode conductor Note: answer both the questions with proper explanation. As per bartleby honor code I can submit 3 questions. So please answer botharrow_forward
- What size equipment grounding conductor is used with # 8 AWG nonmetallic-sheathed cable?arrow_forwardThe voltage drop percentage for a panel feeder with a no continuous load of 180A, using 3/0 THWN copper conductors at 480V, three-phase, and a length of 248' isarrow_forwardWhat is the required size of THHN copper conductors for a feeder serving two 208Y/120V, four-wire, three-phase, 75 degrees Celsius branch circuit panelboards, one with a continuous load of 150A and the other a noncontinuous load of 180Aarrow_forward
- On the 1km long dc distributor above the applied voltage at point O is 200V. Lengths ??? = 100?,??? = 600? and the impedance for the conductor material per 10000m is ?? = 5 < 53.130Ω. Calculate:a. The potential at point C b. Current along section OC of the distributorarrow_forwardWhat is the rated ampacity per phase for six No. 3/0 THHN copper current-carrying conductors with two conductors per phase ( parallel) and all conductors installed in the same conduit? a. 280 b. 315 c. 320 d. 360 Please show work/code references to go with if possible!arrow_forwardWhat is the rated ampacity per phase for six No. 3/0 THHN copper current-carrying conductors with two conductors per phase (parallel) and all conductors installed in the same conduit?arrow_forward
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