Basic Electrical Installation Work

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5 10.84 50 0.41 2.20 1.69 6 6.5 12.66 16 1.64 50 1.49 6 7.10 1 36.08 6 2.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.387 0.1 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 18.91 16 4.454 2.10 1.5 12. this case the factor 1.02 4 9.5 14.44 10 4.5 2.251 2.51 2.727 1.5 24.23 – 16 2.5 19. .78 35 1.911 1.048 1.5 30.774 1.5 7. given Table the Site Guide.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .61 4 1.877 – 25 1.5 1.22 6 3.30 3.07 35 1.16 10 1.15 1.674 2.20 2. Ω.91 10 3.82 25 0.20 25 2.40 35 0.114 1.Overcurrent, short circuit and earth fault protection 249 Table 12.557 – 25 1.71 4 2. Ω The total earth fault loop impedance therefore: ZS 702 202 .98 – 16 2. .87 35 1.5 16.82 4 4.51 50 0.83 10 6.74 50 0.5 1.51 2.524 0.20 1.5 25