Fire-proof power supply cables were one of the more curious things Xigmatek had on display at Computex last week. While the risk is very small, these cables prevent overloaded cables from starting a fire. Most power supplies already feature overload protection to this is an additional safeguard.
The company innovated fire-proof PSU cables that, in practice, minimize the chance of an overloaded cable heating up enough to melt the cable-insulation, shorting up, and starting a fire. If the insulation can stand fire from a lighter, it can withstand a heated cable. Most modern PSUs do feature overload protection that turns the PSU off in case a cable is overloaded.