How to draw the signals of live wire, neutral wire and switch wire connecting light bulb, light bulb switch and socket in household circuits?

First, the main components of household circuits:

Incoming wire, watt-hour meter, master switch, fuse, electrical appliance, socket, lamp holder, switch.

installation diagram/drawing

Second, the connection method of household circuit:

Various electrical appliances are connected in parallel,

The socket and the lamp holder are connected in parallel,

Switches for controlling the operation of various electrical appliances are connected in series with the electrical appliances.

Third, the role of each part of the household circuit:

1, incoming line:

The lines that provide household voltage for users are divided into live line and zero line. There is a voltage of 220V between live wire and neutral wire, and there is also a voltage of 220V between live wire and ground wire. Under normal circumstances, the voltage between the zero line and the ground line is 0V?

2. Master switch:?

Control the on-off of the whole circuit, so as to detect the circuit replacement equipment.

3. Safety device:?

Material: lead-antimony alloy is used for fuse, with high resistivity and low melting point?

Safety principle: when excessive current passes, the fuse generates more heat to make it heat up? When the melting point is reached, the fuse is blown and the circuit is automatically cut off, which plays the role of insurance.

Connection: connected in series with the protected circuit, generally only connected with the live wire?

Choice: The rated current of fuse is equal to or slightly greater than the maximum working current of household circuit. ⑥ Specification: The thicker, the greater the rated current. ?

4. Socket: To supply power to movable household appliances, the socket should be connected in parallel in the circuit, and a hole in three hole socket should be grounded. The left side of the socket is connected to the zero line, the right side is connected to the live line, and the middle grounding line is standard?

5. Electrical appliances:

For equipment that works directly with electric energy, all electrical appliances should be connected in parallel to the circuit. When the lamp is connected to the circuit, the two ends of the lamp holder are connected to the zero line and the live line respectively, and the switch for controlling the lamp must be installed on the connecting line between the lamp holder and the live line, which is also for safety. The spiral sleeve shall be connected to the neutral line.

6. Switch: It can control the on-off of the branch, and the switch should be connected in series with the controlled electrical appliance.

Four, the sample physical map:

Example of circuit diagram