Basic Electrical Installation Work

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5 24. .91 10 3.557 – 25 1.82 25 0. Ω The total earth fault loop impedance therefore: ZS 702 202 .5 16.66 16 1.5 2.83 10 6.02 4 9.22 6 3.727 1.74 50 0. this case the factor 1.08 6 2.048 1.64 50 1. . given Table the Site Guide.41 2.91 16 4.387 0.5 10.5 7.5 12.454 2.78 35 1.51 2.71 4 2.15 1.674 2.07 35 1.5 1.524 0.51 50 0.5 12.51 2.40 35 0.87 35 1.20 25 2.23 – 16 2.5 30.10 1 36.61 4 1.82 4 4.774 1.5 25.44 10 4.20 2.30 3.877 – 25 1.Overcurrent, short circuit and earth fault protection 249 Table 12.5 19.5 14.69 6 6.20 1.1 Table the IEE Site Guide: Value Resistance/Metre for Copper and Aluminium Conductors and per Metre 20°C in Milliohms/Metre Cross-sectional area (mm2 ) Resistance/metre (R1 R2)/ metre (mΩ/m) Phase conductor Protective conductor Copper Aluminium 1 18.49 6 7.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.114 1.16 10 1.911 1.5 1.20 1.251 2.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .98 – 16 2.84 50 0.10 1. Ω