Basic Electrical Installation Work

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71 4 2.98 – 16 2.08 6 2.5 14.774 1.524 0.251 2. Ω The total earth fault loop impedance therefore: ZS 702 202 .66 16 1.69 6 6.877 – 25 1.51 50 0.5 12.07 35 1.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .02 4 9.20 2.91 16 4.83 10 6.41 2.84 50 0.387 0.64 50 1.5 24. Ω.91 10 3.5 2. given Table the Site Guide.5 19.1 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 18.727 1.557 – 25 1.Overcurrent, short circuit and earth fault protection 249 Table 12.5 1.15 1.5 25.10 1 36.048 1.20 1.10 1.51 2.82 4 4.5 7.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.5 30.49 6 7. .674 2.20 1.454 2.82 25 0.911 1.51 2.23 – 16 2.44 10 4.74 50 0.5 10.16 10 1.114 1.40 35 0.78 35 1. this case the factor 1.61 4 1.30 3.5 16. .5 12.22 6 3.5 1.20 25 2.87 35 1