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An electrical current of 700 A flows through a stainless steel cable having a diameter of 5 mm and an electrical resistance of 6 X 10-4 ?/m (i.e., per meter of cable length). The cable is in an environment having a temperature of 30°C, and the total coefficient associated with convection and radiation between the cable and the environment is approximately 25 W/m2 · K.
(a) If the cable is bare, what is its surface temperature?
(b) If a very thin coating of electrical insulation is applied to the cable, with a contact resistance of 0.02 m2 · K/W, what are the insulation and cable surface temperatures?
(c) There is some concern about the ability of the insulation to withstand elevated temperatures. What thickness of this insulation (k = 0.5 W/m · K) will yield the lowest value of the maximum insulation temperature? What is the value of the maximum temperature when the thickness is used?
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