First you need to know if your three live wires are the same phase. You can use a multimeter to measure the AC voltage at 1000 V. If both live wires read 0 with a multimeter, then the two live wires are the same phase and can be connected together. If a multimeter is used to measure the voltage between two live wires and it is 380V, then they are not in the same phase but three phase live wires. They must not be connected together, otherwise it will cause a short circuit, generate a. huge current and burn the wires, or even cause a fire. It's best to ask an electrician to help you handle it, safety first.
What to do if an electrical appliance suddenly catches fire at home:
Don't worry yet. If an electrical appliance catches fire, the first thing to do is to turn off the switchpower supply to avoid a larger fire.
Then simply use a flame retardant to spray on the burning power supply. If there is no suitable fire protection equipment, you may wet the quilt and cover it with the burning electrical appliance. This method is also very effective.
Once an electrical appliance catches fire, you should first turn off the power supply, then use a fire extinguisher to spray the electrical appliance, or use sand, earth, etc. as a fire extinguishing material. Never use. wet ones. Use your hands to unplug and reconnect the power. In order to prevent household appliances from catching fire, it is best not to overload the appliances with electricity, and some worn-out power cords should be thrown away in time.