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The Neher-McGrath Calculations is a method for calculating underground cable temperatures and cable ampacity ratings. The Calculations method derived from: J. H. Neher and M. H. McGrath, "The Calculation of the Temperature Rise and Load Capability of Cable Systems," AIEE Transactions, Part III, Volume 76, pp 752-772, October 1957. This paper considers the heat transfer issues associated with underground system ampacities. The paper cites the following basic equation for calculation of a cable ampacity:
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