Cable fires are caused by the current flowing through a wire exceeding its current rating Voltage is largely irrelevant Have a look at the gauge of mains wire

Cable fires are caused by the current flowing through a wire exceeding its current rating Voltage is largely irrelevant Have a look at the gauge of mains wires (~14-22 AWG) compared to what you'd put on a serious 12V-48V battery (2-8 AWG)