For assessing cable rating with regard to heating, soil thermal resistivity (STR) measurements are taken at proposed cable depth using a Thermal Properties Analyser. This is fitted with a 1.27 mm diameter probe sensor using the transient line heat source method. The probe is inserted into a 40 mm diameter hand auger borehole and using a ‘slide rod’ system the probe sensor is located into the soil at required depths. The STR is measured over a 90 second period and results displayed in units as meter-degrees C per watt (m C W-1).
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