Is the air switch connected to the incoming line or outgoing line of the meter

Is the air switch connected to the incoming line or outgoing line of the meter

Under normal circumstances, it is at the outlet of the meter

The electricity meter connects 2.5 wire to the air switch, and then connects 6 square wire from the air switch to the air switch upstairs. Is it OK

Generally speaking, it's not impossible to connect the meter in this way. It's not good when it's used for a long time. It's better to change the line connecting the meter to the air switch into a 6-square line (a little less), and then connect the 6-square line from the air switch to the upstairs. This is the best way
Hope to adopt

Why is the watt hour meter pressed in front of the main switch and the fuse connected behind the main switch

Why is the electric energy meter pressed in front of the main switch
This ensures that the meter is not affected by household appliances and can be transported away normally
Why should the fuse be connected behind the main switch
In this way, the main switch can be pulled down after the fuse is broken, and the fuse can be changed under no power state

This is the circuit designed by Xiao Ming. He wants to use the ammeter to measure the current of the small light bulb L2. ① draw the corresponding circuit diagram; ② change a wire in the diagram, so that the ammeter can directly measure the total current of the two bulbs, draw this wire, and draw the modified circuit

(1) Starting from the positive pole, one branch returns to the negative pole through the ammeter, bulb L2 and switch, and the other branch returns to the negative pole through the bulb L1 and switch, as shown in the figure; (2) connect the b-terminal wire connecting bulb L2 and the positive pole of the power supply with the negative terminal of the ammeter; at this time, the ammeter measures the total current of the circuit; as shown in the figure: