# Zero Sequence Impedance in Cables

When the R and X Positive Sequence Impedances are entered in a cable library, the R and X Zero Sequence cells also get populated.

What equations/formula are used to calculate these values?

Factor for RZERO_NONMAG = 1.5898;

Factor for XZERO_NONMAG = 2.5442;

Factor for RZERO_MAG = 3.1515;

Factor for XZERO_MAG = 2.4617;

If DuctMaterial is "Non-Magnetic"

Rzero = 1.5898 *Rpos;

Xzero = 2.5442 *Xpos;

If DuctMaterial is "Magnetic"

Rzero = 3.1515 *Rpos;

Xzero = 2.4617 *Xpos;

What equations/formula are used to calculate these values?

Factor for RZERO_NONMAG = 1.5898;

Factor for XZERO_NONMAG = 2.5442;

Factor for RZERO_MAG = 3.1515;

Factor for XZERO_MAG = 2.4617;

If DuctMaterial is "Non-Magnetic"

Rzero = 1.5898 *Rpos;

Xzero = 2.5442 *Xpos;

If DuctMaterial is "Magnetic"

Rzero = 3.1515 *Rpos;

Xzero = 2.4617 *Xpos;

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