Basic Electrical Installation Work

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16 10 1.454 2.51 2.69 6 6.91 16 4.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .41 2.10 1.557 – 25 1.91 10 3.84 50 0. given Table the Site Guide. .64 50 1.51 2.5 7.5 12.20 1.71 4 2.22 6 3.74 50 0.5 16.5 30.44 10 4.23 – 16 2.20 1.98 – 16 2.5 12.78 35 1.877 – 25 1.87 35 1.82 4 4.40 35 0.524 0.08 6 2.51 50 0.5 14. this case the factor 1.02 4 9.Overcurrent, short circuit and earth fault protection 249 Table 12.114 1.5 19.20 2.387 0.83 10 6.5 1.07 35 1.30 3. Ω. Ω The total earth fault loop impedance therefore: ZS 702 202 .048 1.5 24.911 1.5 25.251 2.10 1 36.15 1.5 2.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.66 16 1.5 10.1 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 18.5 1.61 4 1.727 1.674 2.20 25 2.774 1.49 6 7. .82 25 0