^ Indeed, infact I think many users would (ie 3x480s anyone? ) be happy with a quality 1200W even if it does only a little less than the Corsair AX but quite a bit cheaper.
I'm sure Corsair is not stupid enough to let the wires melt.
OCP should prevent melting in most cases, but a partial short may be problematic like jonnyguru mentioned. Either way, 100A is reaching the limit of small wire gauges.