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+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION 
+
+// PART II : TRANSMISSION AND DISTRIBUTION
+// CHAPTER 17: ELECTRIC POWER SUPPLY SYSTEMS
+
+// EXAMPLE : 17.4 :
+// Page number 424-425
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+n = 3.0       // 3-phase 4 wire ac system
+
+// Calculations
+a2_a1 = 1.0/6            // Ratio of cross-sectional area of 2 wire dc to 3-phase 4-wire system
+ratio_cu = 3.5/2*a2_a1   // Copper for 3 phase 4 wire system to copper for 2 wire dc system
+
+// Results
+disp("PART II - EXAMPLE : 17.4 : SOLUTION :-")
+printf("\nCopper for 3-phase 4-wire system/Copper for 2-wire dc system = %.3f : 1", ratio_cu)