Basic Electrical Installation Work

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048 1.08 6 2.674 2.5 16.02 4 9.114 1.5 2. Ω The total earth fault loop impedance therefore: ZS 702 202 .78 35 1.5 10. .41 2. given Table the Site Guide.5 14.82 25 0.22 6 3.07 35 1.84 50 0.44 10 4.20 25 2.30 3.23 – 16 2.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.5 19.66 16 1.5 7.51 2.251 2.51 2.387 0.91 10 3.64 50 1.61 4 1.98 – 16 2.20 2.82 4 4. .91 16 4.10 1.877 – 25 1.557 – 25 1.83 10 6.454 2.774 1. this case the factor 1.5 30.87 35 1.727 1.15 1.40 35 0.71 4 2.Overcurrent, short circuit and earth fault protection 249 Table 12.5 24.1 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 7.74 50 0.69 6 6.524 0.51 50 0. Ω.20 1.5 1.911 1.16 10 1.5 12.5 12.5 25.5 1.20 1.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .10 1 36