6. An electrical cable of radius 5mm is designed to carry an electrical current such that the heating effect is 300 W pe

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6 An Electrical Cable Of Radius 5mm Is Designed To Carry An Electrical Current Such That The Heating Effect Is 300 W Pe 1 (19.62 KiB) Viewed 49 times

6. An electrical cable of radius 5mm is designed to carry an electrical current such that the heating effect is 300 W per metre length. The cable is in an environment having a temperature of 25°C. The heat transfer coefficient between the cable and the environment is 25 W/m²K. A very thin coating of electrical insulation is applied to the cable, with a contact resistance equivalent to 0.02 m K/W. (a) What are the electrical insulation and cable surface temperatures? (b) What effect does the electrical insulation have on the cable temperature? (Ans = 789°C, 1171°C; 789°C)