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# myCableEngineering Calculation

## Calculation Method

Calculation of impedance is reasonably involved.  Other notes give an insight into the individual calculations.  With myCableEngienering, the calculation will typically follow the following procedure

1. d.c. resistance - is determined using IEC60288.  For any cases in which IEC 60228 is not suitable, the resistance is obtained using CENELEC CLC/TR 50480. See also Conductor Resistance.
2. temperature adjustment - the calculated d.c. is adjusted so that is value is accurate relative to the operating temperature of the conductor.
3. a.c. resistance - the a.c. resistance is obtained by applying skin and proximity effect factors as defined in IEC 60287. See also Conductor Resistance.
4. positive and zero sequence impedance - are calculated using the methods give in IEC 60909 and resistance values calculated above. See also Impedance.

### Resistance, Reactance

Positive and zero sequence impedances calculated above, are in complex form.  The real part of the impedance gives the resistance and the imaginary part the reactance.

### Capacitive Reactance

Current we do not calculate capacitive reactance.  This will likely be added as the application grows and develops the need for capacitive reactance.