30/7/2016 Page 1TiSoft ElectricalDesign LineDetailedCalculationIEC60364
Line analytical calculations according to IEC 60364Switchboard - Working voltage DB2 , Switchboard , 3~400V 50Hz
Line No 7 , LOAD 7
Load electrical characteristicsNumber of phases / Rated voltage U 3~400 V
Installed power Pinst 50,00 kW
Simultaneity η 1,00
Absorbed power P 50,00 kW
Power factor cosφ 0,85
Load type Sockets
Design current Ib=P/(1.732·U·cosφ) 84,9 A
Circuit protection deviceProtection device nominal current In 100 A
Basic condition holds Ib < In < Iz 84,9 < 100 < 105,6
Installation Method, Correction factorsNumber : 72 (Table A.52.3)Sheathed single-core or multi-core cables direct in the ground– without added mechanical protectionReference Method : D2
Ground Temperature, Table B.52.15 = 25°C
Soil-thermal Resistivity = 3,0 K*m/W
Number of circuits = 6
Cables are touching
Ambient temperature correction factor , Table B.52.15 k1 0,95
Grouping correction factor , Table B.52.18 k2 0,50
Cable cross-section sizingCable NYY-O 3X150+70 sm + NYY 1X70 rm
Maximum permissible conductor temperature θcond,max 70,0 °C
Table with current rating of cables under reference conditions Table B.52.4 col. 8
Current rating of cable from the above table Ir 247,0 A
Current rating of cable under operation conditions Iz = Ir·k1·k2 105,6 A
Cable losses Ploss 2,7 W/m
Cable conductor temperature θcu 54,1 °C
Cable cross-section D 43,0 mm
Cable weight G 5.750,0 kg/km
Cable check to voltage dropDirect current resistance at 20°C (IEC 60502-1) R20 0,124 Ω/km
Corrected direct current resistance at 70°C R 0,148 Ω/km
Cable inductive reactance (IEC 60502-1) X 0,100 Ω/km
Cable length L 15,0 m
Cable impedance Z = L·(R·cosφ + X·sinφ) 0,003 Ω
Cable voltage drop ΔU = 1.732·Ib·Z 0,39 V
Cable voltage drop % ΔU% = (ΔU·100)/U 0,10 %
Cable permissible voltage drop ΔUmax% 2,00 %
Voltage drop % from the beginning of the installation ΔUtotal 0,51 %
Short-circuit enduranceProspective short circuit current on switchboard busbars Ik 10,04 kA
Conductor cross-section q 150,0 mm²
Material coefficient for copper conductors k 115 A/mm²
Short-circuit permissible cut time t 5 s
Minimum conductor cross-section qmin mm²
Tripping checkProtection device characteristic curve MCB B
Instantaneous element operation current I5 500 A
Source impedance r = U/Ik 0,02291 Ohms
Short-circuit current at the end of the line Io = U/(r+Z) 8.990 A
Line analytical calculations according to IEC 60364
Page 2 30/7/2016LineDetailedCalculationIEC60364 TiSoft ElectricalDesign
Basic condition holds I5 < Io 500 < 8.990
Line analytical calculations according to IEC 60364
Top Related