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It will be really helpful if some one can give me the calculation step by step or some calculator where in I can resolve my long pending problem. Thanks in advance I will be really glad to have a correct answer. The Q is below

Calculate temperature rise in 3 core cable after 3 hrs.resistance 2.74 ohms/kmat20c.Ambient temperature is 33.4c.Length of cable is 140 meterandcurrent passing through cable is 24.97ampthis isthree phase connectionsoI will be= 24.97/1.732. Size of each core is6.30 sqmmdensity of copper 8.89. So weight of copper in 3 core cable 140 meter comes to: 23.52kg copper.

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# Calculate the rise in temp in copper 3 core wire

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