Basic Electrical Installation Work

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22 6 3.30 3.44 10 4.02 4 9.74 50 0.048 1.78 35 1.66 16 1.5 12.114 1.5 12.51 2.49 6 7. Ω The total earth fault loop impedance therefore: ZS 702 202 .40 35 0.524 0.5 25.69 6 6.727 1.5 14.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .91 16 4.5 16.07 35 1.51 50 0.98 – 16 2.82 25 0.16 10 1.83 10 6.51 2. Ω.5 24.5 1.5 10.20 25 2.251 2.774 1.5 2. this case the factor 1.454 2.87 35 1.71 4 2. given Table the Site Guide.5 30.82 4 4.15 1.61 4 1.10 1.Overcurrent, short circuit and earth fault protection 249 Table 12. .5 7.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.877 – 25 1.674 2.20 1. .10 1 36.20 2.08 6 2.41 2.91 10 3.911 1.23 – 16 2.64 50 1.557 – 25 1.84 50 0.387 0.20 1.5 19.5 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