Cat 5 Ampacity

http://www.sumidacrossing.org/LayoutElectricity/MRRWire/WireAmpacity/

From Stefan H.:

Under the following assumptions up to 3A should be fine.

- 26AWG cat5/6 cable - using two leads - cable is relatively short - normal ambient temps - stepper control (at most use 75% of configured drive current)

Also: https://en.wikipedia.org/wiki/American_wire_gauge