1. For a 220 V household supply, 3 kW/220 V is approximately 11 A.
2. For copper wires of electrical appliances with an overcurrent of 11A, it is recommended to use 1 square meter or 2 square meters if it is generally not used for overload, 1 square meter is enough. it has been used for a long time, 2 square meters is recommended. Be safer.
3. For aluminum wire, 3 square meters is recommended.
4. High-power household electrical appliances need to be considered for a variety of reasons, not just the size of a single wire. It is recommended to find a professional electrician to choose according to the actual situation.