I know too small a wire can melt and even cause a fire under certain conditions, but I always wondered if there were a downside to using a bigger wire or a wire larger than necessary (besides a larger wire will cost more per foot). If a system only needs a 12 gauge wire, for example, what happens if I use a 10, 8, or even 6 gauge? Does the current flow increase, decrease, stay the same? Really curious and don't remember ever seeing this discussed before.
