Given: 1 - EMT, with 3-250 kcm il copper THW feeder conductors and 1-4 AWGTHWN copper ground. What is the total cross -section area of all the conductors?Oa.0.0824 inches squaredb.0.4596 inches squaredOc.1.3788 inches squaredd. 1.4612 inches squared

The given Electric Metallic Tube (EMT) consists of three 250 kcmil copper THW feeder conductors and…

Answered: Given: 1 - EMT, with 3-250 kcm il…

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The 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.
Using the above example, determine the wire size needed for the 400-ampere service in accordance with the National electrical Code. Assume that the conductors have type THWH insulation. (Note: As a general rule, for each 100 feet of conductor length the wire size is increased one standard size because of voltage drop.)
What are the colors of the conductors in nonmetallic-sheathed cable for a. 2-wire cable? _______________, _______________ b. 3-wire cable? _______________, _______________, _______________
What is the voltage rating of the conductors in Type NMC cable? _______________
4. 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 .
An aluminum transmission line is to be replaced by copper having the same total resistance. If thecross-sectional area of the aluminum wire is 820 MCM, what would be the cross-sectional area of thecopper wire ? Given : Resistivity of aluminum = 17 Ω-CM per ft,Resistivity of copper = 10.37 Ω-CM per ft ( ANS ≈ 500 ??? )
The following problems refer to grounding requirements. Give the source of yourresponses. 1. What is the minimum size copper grounding electrode conductor for a service withthree sets of parallel 350 kcmil conductors (three conductors per phase)?
Find the ampacity of a # 4 AWG copper conductor with type RHW insulation. The conductor is to be run in conduit with two other conductors and located in an area with an ambient temperature of 30 degree C.
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
13. If the largest ungrounded service-entrance conductor for a service is 750-kcmil copper, what is the minimum size required for a wire-type main bonding jumper for the service? a) 2/0 AWG copper b) 1/0 AWG copper c) 3/0 AWG copper d) 1 AWG copper 14. 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
3. A two conductor main A B, 500 m in length is fed from both ends at 250 volts. Loads of 50 A, 60 A, 40A and 30 A are tapped at distance of 100 m, 250 m, 350 m and 400 m from end A respectively. If the X-section of conductor be 1 cm2and specific resistance of the material of the conductor is 1·7 µ Ω cm,determine the minimum consumer voltage.
An overhead line has span of 260m. The tension in the line is 1200kg while the conductor weighs 650 kg per 100 meters. Calculate the maximum SAG in the conductor. If the height of the tower is 13 meters, estimate the clearance of conductor to the ground. Draw a figure and mark values of sag, clearance, span, height of conductor etc.

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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