# What is the mean sheath diameter?

 We know that for transposed sheath and cross bonded cable, loss factor due to circulating current is neglected and loss factor due to eddy current is considered. Suppose, I have cable and it has an Aluminium sheath and beneath the sheath there is a concentric layers of copper wire and above the sheath is the cable jacket. Now, to find out the loss factor due to eddy current, I need to know the mean diameter of the sheath. I tried several things, but could not find out this mean diameter. If someone come and share his experience with this calculation that would be a great help. I can provide the data sheet of the cable. asked 10/22/2013 Rahul Majumder3

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