Basic Electrical Installation Work

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877 – 25 1.5 12.66 16 1.5 24.387 0.5 7. this case the factor 1.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.98 – 16 2.15 1.10 1 36.Overcurrent, short circuit and earth fault protection 249 Table 12.114 1.49 6 7.10 1.5 16.78 35 1.41 2.5 25.64 50 1.20 25 2.71 4 2.87 35 1.5 10.911 1.727 1.30 3.07 35 1.82 25 0.251 2.5 2.5 30.91 10 3.91 16 4.08 6 2. .5 14.20 1.51 2.40 35 0.82 4 4.61 4 1.774 1.51 2.22 6 3.20 2. Ω The total earth fault loop impedance therefore: ZS 702 202 .20 and therefore the cable resistance under fault conditions will be: 0 585 702 .454 2.69 6 6.5 1.557 – 25 1.524 0.84 50 0.5 19.674 2.02 4 9.83 10 6.16 10 1. given Table the Site Guide.048 1.5 1.20 1.51 50 0.44 10 4.23 – 16 2. Ω.5 12.1 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. .74 50 0