(1P is only used to cut off the live line and share the zero line for the branch air switch of home decoration. In this case, one of the circuits is cut off, and the zero line still has voltage at the terminal socket of the cut-off circuit, and 2p does not exist. If people do not know whether 1p or 2p are used, they must mistakenly think that there will be no electricity, so it is not very unsafe?)

Answer: according to 6.5.2 of code for design of residential buildings (gb50096-1999), the design of residential power supply system shall meet the following basic safety requirements:

1. TT, TN-C-S or TN-S grounding mode shall be adopted, and general equipotential bonding shall be carried out;

2. The electrical circuit shall be laid in a way that meets the safety and fire protection requirements. The conductor shall be copper wire. The section of each residential incoming line shall not be less than 10 mm2, and the section of branch circuit shall not be less than 2.5 mm2.

3. The air conditioning power socket, power socket and lighting of each house shall be designed separately; Independent circuits should be set for kitchen power socket and toilet power socket;

4. Except for the air conditioning power socket, other power socket circuits shall be equipped with leakage protection devices;

5. Each house shall be equipped with a main power circuit breaker, and shall adopt switching appliances that can disconnect the phase line and neutral line at the same time;

6. Equipotential bonding shall be made in the toilet with bath equipment;

7. The main power incoming circuit breaker of each residence shall have leakage protection function.