EBK ELECTRICAL WIRING RESIDENTIAL
EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 9, Problem 18R
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Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 kW at 400 V and 0.8pf lagging for 4000 hours per annum and open circuited for the remainder of the year. The cost of the cable including installation is (15a+25) per meter, where a 'is area of each conductor in cm². The interest and depreciation total 10 per cent and cost of energy wasted is 10% per unit. The resistance per km of conductor of 1 cm² cross-section is 0.173ohms.
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