Calculation of characteristic Impedance of parallel lines.
The following formula is used to calculate the impedance of two parallel lines.
Zo = 276/sqrt(K) x Log( 2S/d )
where:- S is the centre to centre Spacing of the conductors in mm,
d is the diameter of the conductors in mm
and K is the relative permittivity or dielectric constant of the insulation.
For pvc insulated twin cable use 2.5 as the permittivity K.
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