> From:         Jamie Jensen[SMTP:j_j_140909@YAHOO.COM]
> Sent:         Wednesday, November 12, 2003 9:01 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [EE]: current capacity of copper pour vs trace widths

> Using some of the calculators online, you can get a good idea of the
trace width or surface area of the copper for a current draw.

> Does it matter on the voltage?  Meaning if you have 1.5V @ 20A vs 3.3V @
20A, the wattage is different but the calculators do > not seem to take
this in account.  I am just trying to estimate trace widths for different
voltages.  Maybe it doenst matter.

The voltage matters only for the separation between conductors. That is, it
matters only for the
width of the spaces. This spacing is sometimes called "creepage", and some
safety standards
require minimum amounts of this spacing for voltages in excess of certain
values (in particular,
line or mains voltage).

John Power

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