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Skin and proximity effect coefficient b PAC/GIL conductor

The equation for $z_c$ < 5 is identical in CIGRE TB 2018 (2003), Elektra 100 (1985), and Elektra 125 (1989).

The equation for $z_c$ > 30 in CIGRE TB 2018 (2003) is missing a factor 2 in the square-root and the equation in Elektra 125 (1989) has the factor 5 falsely inside the square-root.

Coefficients of the polynomial interpolation are taken from Table II of Elektra 125 (1989) whereas the first value used in CIGRE TB 218 (2003) is wrong.

Symbol
$b_{c}$
Formulas
$\frac{56}{211+{z_{c}}^2}$$z_{c}<5$
$\frac{2}{4\sqrt{2z_{c}}-5}$$z_{c}>30$
$0.5356-2.1030734{\cdot}{10}^{-1} z_{c}+6.495563{\cdot}{10}^{-2} {z_{c}}^2-1.089373{\cdot}{10}^{-2} {z_{c}}^3+1.0372874{\cdot}{10}^{-3} {z_{c}}^4-5.8238557{\cdot}{10}^{-5} {z_{c}}^5+1.9109965{\cdot}{10}^{-6} {z_{c}}^6-3.3893677{\cdot}{10}^{-8} {z_{c}}^7+2.509622{\cdot}{10}^{-10} {z_{c}}^8$otherwise
Related
$e$
Constant $e$ [m/s$^2$]
$z_{c}$
Factor z to calculate skin effect coefficients for conductor
Used in
$y_{c}$
Skin and proximity effect factor y PAC/GIL conductor