Basic Electrical Installation Work

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10 1 36.83 10 6.49 6 7.61 4 1.5 1.84 50 0.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.5 16.727 1.51 2.674 2.557 – 25 1.20 1.08 6 2.774 1.5 25.51 2.20 1. given Table the Site Guide.23 – 16 2.114 1. .877 – 25 1. .20 2.911 1.048 1.5 14.5 19.30 3.524 0.98 – 16 2.5 30.5 10.66 16 1.64 50 1.69 6 6.71 4 2.5 7.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .5 24.251 2.16 10 1. this case the factor 1.15 1.02 4 9.82 4 4.5 1.5 2.07 35 1.Overcurrent, short circuit and earth fault protection 249 Table 12.91 16 4.454 2.44 10 4.1 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. Ω The total earth fault loop impedance therefore: ZS 702 202 .22 6 3.41 2.82 25 0.74 50 0.5 12.5 12.51 50 0.78 35 1.87 35 1.91 10 3. Ω.10 1.387 0.20 25 2.40 35 0