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Is your house a villa? Three-phase five-wire power supply is 380 volt and 220 volt power.
If there are three floors, then each floor is placed with a distribution box, and each distribution box is a one-phase power supply.
If your house is no more than 200 square meters, you don't need a three-phase five-line one.
Looking at the above distribution method, yours is not a three-phase five-wire, it should be a single-phase incoming line.
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The refrigerator also needs to be joked all the way alone.
There is no problem at all, but the power of the water heater is relatively large, and it is recommended to directly replace it with a whole line, and the hardware points are sold.
The toilet equipotential cannot be connected to the ground wire of the socket. >>>More