CONVERSION FACTOR FOR DEVIATING AMBIENT TEMPERATURES Ambient temperature over 30°C CONVERSION FACTORS APPLIED TO THE ABOVE CURRENT RATINGS TABLE Ambient temperature over 50°C (heat-resistance) Conversion factors Ambient temperature °C Applied to the above current ratings table Rubber insulation Permissible operating temp. at conductor Conversion factors up to 60°C PVC insulation Permissible operating temp. at conductor Conversion factors up to 70°C over 30 to 35 0.91 0.94 over 35 to 40 0.82 0.87 over 40 to 45 0.71 0.79 over 45 to 50 0.58 0.71 over 50 to 55 0.41 0.61 over 55 to 60 - 0.5 over 60 to 65 - 0.35 Conversion factors, applied to the above current ratings table Ambient temperature °C Permissible operating temp. at conductor Conversion factors up to 90°C Ambient temperature °C Permissible operating temp. at conductor Conversion factors up to 110°C over 50 to 55 0.94 over 50 to 55 1 over 55 to 60 0.87 over 55 to 60 1 over 60 to 65 0.79 over 60 to 65 1 over 65 to 70 0.71 over 65 to 70 1 over 70 to 75 0.61 over 70 to 75 1 over 75 to 80 0.5 over 75 to 80 1 over 80 to 85 0.35 over 80 to 85 0.91 over 85 to 90 - over 85 to 90 0.82 over 90 to 95 0.71 over 95 to 100 0.58 over 100 to 105 0.41 over 105 to 110 - Appendice • Appendix 269
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