The relationship between current load and temperature rise inshielded and reeled coal mine trailing cables was investigated.Temperatures within and on the cables were measured with thermocouplesand the data recorded over time by computer. Steady-state DC load testswith two types of SHD-GC cable revealed that only 3 to 7% more currentthan Insulated Cable Engineers Association (ICEA) ratings for shieldedcables was required to reach rated insulation temperature. The abilityof the metallic shielding to dissipate heat was reflected in longerthermal time constants than for unshielded designs. Steady-statetemperature rises where then monitored in a two-conductor unshielded,flat cable wound on a shuttle car cable reel. Stabilized axialtemperature profiles exhibited maxima midway between the reel flanges.Static derating factors were considerably less than ICEA ratings forreeled cables. The finding suggest that deratings for trailing cableswound on reels should be based on the specific cable configuration
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