I am working on a project on Perfboard which involves controlling a motor that draws about 10A, and I am using 18AWG stranded wire to connect the MOSFET on board to the battery and motor which are off board.
The problem is that the wires are too large to fit in the holes, and if I cut some of the strands short so that the wire fits in the hole, the other strands work their way out of the insulation and are in danger touch nearby components. What I'm doing now is laying the wire flat across a few holes and soldering it surface mount, which seems to work better, but I'm worried about pulling the copper right off the board. The oval shapes on the boards above also seem to be useful for this purpose as there's more copper to attach to.
What's the best way to solder power wires to a piece of protoboard? How do you handle strain relief?