July 27th, 2013, 04:48 AM
I'm not sure if you are talking about a schematic (circuit diagram) or PCB layout.
If the former, you can make wires cross as much as you like although you should minimise them for clarity.
If PCB layout, then it depends how many layers you have. The PCB layout software should either prevent you doing layouts that would short wires or include a function to check that you haven't. (It shoudl also be able to do the layout for you, automatically.)
ei incumbit probatio qui dicit, non qui negat