wire gauge and steppers

Hi all,

I am trying to figure out the wire sizes needed inside my panel
between the transformer and rectifier-cap and Gecko's.

I want to use 4 Geckos, 3 set for 2.4 amps and one set for 1.5 amps.

Since the DC buss is 35 volts, I don't think 18 ga would be a problem
to the Geckos or to the Steppers.

I googled 'wire chart, 'wire gauge chart' and so forth, but have not
found any simple tables for rating 18 ga on a 24VAC line or on the DC
line. assuming the 24VDC runs about 4 inches, I hope 18 is fine.

Anyone have any links to either the calculatins or a chart ?

Dave