Basic Electrical Installation Work

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Strana 260 z 399

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5 25.20 25 2.22 6 3. .30 3.87 35 1.5 24. .20 1.10 1.91 16 4.74 50 0.048 1.5 10.5 19.5 7.71 4 2.10 1 36.5 2.20 1.91 10 3.02 4 9.82 4 4.64 50 1.5 30.66 16 1.114 1.727 1.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.5 1.82 25 0.877 – 25 1.44 10 4.98 – 16 2.5 12. Ω.20 2.69 6 6.5 1. given Table the Site Guide.61 4 1.16 10 1.83 10 6.23 – 16 2.51 2.674 2.Overcurrent, short circuit and earth fault protection 249 Table 12.251 2.78 35 1.40 35 0.15 1.49 6 7.5 16.51 2.5 12.51 50 0.08 6 2.454 2. Ω The total earth fault loop impedance therefore: ZS 702 202 .5 14.41 2.07 35 1.911 1. this case the factor 1.557 – 25 1.1 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 18.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .387 0.84 50 0.774 1.524 0