September 2013 Septembre 2013 IEC 60909 3 (Edition 3 – 2009) Short circuit currents in three phase a c systems – Part 3 Currents during two separate simultaneous line to earth short circuits and parti[.]
IEC 60909-3 CEI 60909-3 (Edition – 2009) (Édition – 2009) Short-circuit currents in three-phase a.c systems – Courants de court-circuit dans les réseaux triphasés courant alternatif – Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial shortcircuit currents flowing through earth Partie 3: Courants durant deux courts-circuits monophasés simultanés séparés la terre et courants de court-circuit partiels s'écoulant travers la terre CORRIGENDUM Corrections in the French version are given after the English Table – Resistivity of the soil and equivalent earth penetration depth Replace for rocks 5150 by 5100 and for farmland 1320 by 931 as follows: Soil types Granite Rocks Stony soil Pebbles, dry sand Calcareous soil, wet sand Farmland Clay, loam Marshy soil 8.3.2.1 Soil resistivity ρ Equivalent earth penetration depth δ m Ωm >10 000 000 10 000 000 000 200 200 70 200 50 100 10 50 9 300 100 330 950 5110 320 230 780 320 660 931 295 660 8 500 670 520 690 670 200 950 710 200 600 850 270 600