# 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?

FRZERO_NONMAG = 1.5898f;

FXZERO_NONMAG = 2.5442f;

FRZERO_MAG = 3.1515f;

FXZERO_MAG = 2.4617f;

If DuctMaterial is "Non-Magnetic"

Rzero = FRZERO_NONMAG*Rpos;

Rzero = FXZERO_NONMAG*Xpos;

If DuctMaterial is "Magnetic"

Rzero = FRZERO_ MAG *Rpos;

Rzero = FXZERO_ MAG *Xpos;

What equations/formula are used to calculate these values?

FRZERO_NONMAG = 1.5898f;

FXZERO_NONMAG = 2.5442f;

FRZERO_MAG = 3.1515f;

FXZERO_MAG = 2.4617f;

If DuctMaterial is "Non-Magnetic"

Rzero = FRZERO_NONMAG*Rpos;

Rzero = FXZERO_NONMAG*Xpos;

If DuctMaterial is "Magnetic"

Rzero = FRZERO_ MAG *Rpos;

Rzero = FXZERO_ MAG *Xpos;