Basic Electrical Installation Work

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674 2.5 2.5 24.774 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. .387 0.114 1.5 12.15 1. this case the factor 1.51 2.10 1.28 Reproduced from the IEE Site Guide kind permission the Institution Electrical Engineers.5 1.911 1.41 2.02 4 9.454 2.5 16.20 and therefore the cable resistance under fault conditions will be: 0 585 702 .07 35 1.23 – 16 2.048 1.87 35 1.5 12. given Table the Site Guide.30 3.64 50 1.5 10.5 19.20 1.82 4 4.10 1 36.83 10 6.251 2. Ω The total earth fault loop impedance therefore: ZS 702 202 .82 25 0.22 6 3.08 6 2.5 30. Ω.877 – 25 1.20 2.71 4 2.20 25 2.51 50 0.84 50 0.61 4 1.51 2.5 1.Overcurrent, short circuit and earth fault protection 249 Table 12.98 – 16 2.44 10 4.74 50 0.91 10 3. .727 1.49 6 7.524 0.5 14.20 1.78 35 1.91 16 4.69 6 6.5 7.66 16 1.557 – 25 1.40 35 0.5 25.16 10 1