The important final conclusion is that the evaluation by empirical relations or graphical methods of the current capacity of printed circuit tracks (traces) does not represent methods for determining absolutely precise the asked measures. It is recommended the introduction of a weighting factor ψ=0.7...0.8 in order to obtain a greater imunity at the inherent calculus errors (for example if it was obtained a maximum allowed value of 2A through a track it is good not to accept currents more than 1.4 ... 1.6 A; similarly, for a minimum allowed width of 1 mm, it is recommended to generate a track of minimum 1.25 ... 1.4 mm).