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Underground Cables Need a Proper Burial | T&D World ABB Power Grids, Tensio TN AS To Deliver Fully Digital, Eco-Efficient Substation in Norway. Nov 13, 2020. ... All the heat generated by an underground power cable must be dissipated through the soil. This is quantified by the soil thermal resistivity (or thermal rho, °C-cm/W), which can vary from 30 to 500°C-cm/W. Electrical engineers ...

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