I am using 14 gauge wire. Two sets going to the board from the power supply and a third to the heatbed relay. I have checked, but will triple check that all connections are solid. I would think that 3 sets of 14 gauge wire should be enough to run this short of a distance. Heck, my 2000 watt speakers are running 12 gauge wire across 50 feet which is pretty my industry standard.