Wire size and track width

Discussion in 'General Electronics Chat' started by Barry M, Feb 27, 2009.

  1. Barry M

    Thread Starter Active Member

    Feb 11, 2009
    I am just wondering what the recommended wire size and home made PCB track widths are acceptable for which power ratings.

    The choices I have are:

    0.025" Grid 0.010" Track
    0.050" Grid 0.020" Track
    0.100" Grid 0.040" Track
    0.100" Grid 0.060" Track

    The wire/cable I have yet to buy and am unsure what to go for, I have loads of single core .06 but I doubt thats heavy enough for what Im looking for.

    I have one project that the output is 12V 15A and another with 5V 500mA. But if theres a chart or a guide I could look up for future use, or a rough idea, then that would be great, thanks.
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    For trace widths in a given thickness of copper, the following may be of utility: http://circuitcalculator.com/wordpress/2006/01/31/pcb-trace-width-calculator/

    For round conductors, rule of thumb is maximum 500 Kcmils per Amp, 750 Kcmils per Amp with poor cooling conditions.

    For our metric-using friends, rule of thumb is maximum 0.25mm^2 per Amp, 38mm^2 per Amp with poor cooling conditions.