Electrician s please come in Thank you 50 minutes!!

It was your fault that the ground wire was the zero line before, because the ground wire is a public wire (connected to the earth, connected to the wrong one, and it is not uncommon for the wall to be electrified), which is usually not electrified, and it is connected to the zero line to form a circuit with the live wire, which is not right in your home (to be exact, the master who decorates your home is wrong), and something is going to happen. Hurry up and find an electrician to change it.

Now, if you have changed it, then the upstairs is vexatious, at least it doesn't have anything to do with you (looking for a developer, looking for an electricity bureau, looking for a property, and having trouble with neighbors); If you don't change it, it's probably your fault, it's just possible. (The upstairs socket is not good, how can you be sure of your family's problem, isn't it that you don't know how to pretend to understand, nothing to fool around). This kind of thing is difficult to talk about, after all, there is no on-site measurement, and it is not clear what is going on on the Internet.

It can only be guessed. It's best to check with the property, haven't you paid the property fee? I want to enjoy the service.

If the socket is not used, wrap the end of the wire, and it will not be charged under normal circumstances. Don't wrap a few wires together, separate the package, if you feel that you can't wrap well, you can continue to connect to the socket, don't connect the load (that is, never use that socket again).

It's also foolish to decorate you, and you dare to do such a big thing as the ground wire as the zero line. I'd rather not have that socket than this?! The landlord must have been.

Nothing happened, it's too late to correct it now, the socket on the upstairs of your house is on your head, just don't admit it, even if it has something to do with your family. Let him take the evidence, he said with red lips and white teeth that your home is your home? He's not an engineer.

If your home has changed the distribution line by yourself, did not pay attention, and connected the wrong wire, then the entire building will come to you if the electricity is burned, and if the property electrician is wrong, the property should be responsible. One household and one meter refers to the fact that each family has a fire line, and the zero line of the whole building is connected, and the ground line of the whole building is connected. If your home breaks the main switch of the distribution box (that is, pulls the main switch of your home), the neutral wire and the live wire are generally disconnected, but the ground wire is still connected, and the ground wire mainly plays a protective role.

It may be that the lines of your two families share a ground wire, and your home may not have a zero line or the zero line is broken, and the ground wire is replaced, on the contrary, if there is no problem with the line in your home, it is the one you are upstairs, so there will be the phenomenon you said. I'm passing through here, I see your problem, if you can't deal with it, please don't ball me on it, thank you.

Tell you why:

This is a problem left over from the original house: the electrician did not know why the zero wire of the two switches of your two switches was missing, so he had to connect the grounding wire as the zero line, so the above problem occurred. (This is not only unsafe but also wastes electricity).

You tell him that you are also a victim.

Expand the range of the ammeter of 3A to 15A, then the current flowing through the ammeter is the total current: 3A 15A = 1 5, connected to the circuit with a current of 10A for testing, then the current through the ammeter is: 10A * 1 5 = 2A

Learn the basics of electricians.

wms1856:

Hello! Questions you asked:

1: When the voltage is equal, is the resistance of the wire proportional to the current or inverse?

My answer is: inversely proportional, according to Ohm's law i (current) = u rWhen the voltage is the same, the current is small if the resistance is large, and the current is large if the resistance is small; When the resistance is the same, the current is large if the voltage is large, and the current is small if the voltage is small; When the current is the same, the greater the resistance, the greater the voltage distributed, because the greater the resistance, the current.

2: Why can the star triangle start to lower the pressure?

My answer is: because asynchronous motors are widely used because of their simple structure, cheap and high reliability. However, in the starting process, the starting current is large, so the motor with large capacity must be started in a certain way, and the Xingyi triangle switch start is a simple and convenient step-down starting method.

Star-delta starting can be achieved by manual and automatic operation control.

For the squirrel cage asynchronous motor with the normal operation of the stator winding triangle connection, if the stator winding is connected into a star shape at the time of starting, and then connected into a triangle after the start is completed, the starting current can be reduced and its impact on the power grid can be reduced. This type of starting is called star-delta decompression start, or simply star-delta start (Y-δ start).

When the star triangle is used for starting, the starting current is only 1 3 when the original triangle connection is directly started. If the starting current at direct start is calculated as 6 7ie, then when starting in the star delta, the starting current is only 2 times.

The starting current is reduced, and the starting torque is also reduced to 1 3 when starting directly according to the triangle connection. It can be seen that when the star-delta starting mode is adopted, the current characteristics are very good, but the torque characteristics are poor, so the objective existence is only suitable for no-load or light-load starting occasions. In other words, due to the small starting torque, the advantages of star-delta starting are still very significant, because the star-delta starter based on this starting principle is the simplest and cheapest compared with any other decompression starter.

In addition, the star-delta starting method also has the advantage of allowing the motor to run under the star-shaped connection when the load is light. In this case, the rated torque can be matched to the load, which increases the efficiency of the motor and thus saves power consumption.

y— Buck start is also known as star-triangle buck start, referred to as star-delta buck start. The design idea of this line is still to control the starting process according to the principle of time. The difference is that the stator winding of the motor is connected into a star shape at the time of starting, and the voltage borne by each phase winding is the phase voltage of the power supply (220V), which reduces the impact of the starting current on the power grid.

In the later stage of its starting, it is changed to a triangle connection according to the preset time, and the voltage borne by each phase winding is the line voltage of the power supply (380V), and the motor enters normal operation. This kind of line can be used for all squirrel cage asynchronous motors where the stator windings are connected into triangles during normal operation.

i=u r, the first question is clear at a glance! The second one! This is because the phase voltage of the star connection is 220 and the triangle is 380.

1. If the heat is considered, the current is large and the resistance is small, but if the heat is not considered, the resistance will not change.

2. When the motor starts directly (δ), the stator winding voltage is 380V, and when the Y-shaped start, the stator winding voltage is 220V.

3 All the plugs are broken, you want to take them out, make it clear! Disconnect the main switch, turn off the power and then disassemble the socket panel. It is impossible to destroy, you first have to remove the waterproof cover, some are screws, some are card type, find out the cover to see that there is a card position under the panel, pry open the panel, and remove the connected wire.

Take a picture and remember how each line is connected. It is estimated that this kind of socket is iron-framed, and it is also a card type, and the socket is disassembled and the iron sheet is taken out and reinstalled.

Whatever the method, be sure to operate with the power off.

Now the sockets are equipped with protective doors, and you don't know if it will work with needle-nose pliers, you can try a variety of methods.

It's not going to be a mess yet.

The problem of LED lights is nothing more than two reasons, 1 is the driver and 2 is the lamp beads. Most of the drive is broken, and it is also possible that the drive is broken, which affects the lamp beads and is broken at the same time, so replace it with a better brand of light board.

When you hear the ring, check whether your main switch is connected to the wire firmly, if it is firmly connected and ringing, don't care about it, you can't do it.

The air conditioners in the two rooms are turned on independently, no problem.

The maximum electricity consumption is your hall, hot pot, boiling water, and fire, and maybe air conditioning, but you can't see the air conditioning in the living room. Look at whether the line is thick enough, at least 4 square starts, not enough overcurrent do not use at the same time.

The bathroom has an electric water heater, and it is best to separate it from the kitchen.

It can't be changed, it will be used, and there is no big problem.

According to your description and analysis, there may be a virtual connection in the entrance line, which should be checked to eliminate hidden dangers.

As for the distribution box, the capacity of each branch switch is 32A, which is obviously not suitable. Switches with the appropriate capacity should be selected according to the load size of each circuit.

The main switch should not use a leakage circuit breaker, and the ordinary air opening should be applied, and the capacity should be matched with the load size, the inlet line, and the capacity of the meter. Socket circuits, kitchens and bathrooms need to use leakage circuit breakers, and other branches are opened with ordinary air.

I personally feel that several important operational topics, 4What is an electrical appliance that can cut off the load current and the short-circuit current? 1. Circuit breaker 4

The operation ticket shall be based on the duty officer or (c.).Shift Leader) issued the operation 7If the motor is started by Y-δ, its starting current is 8 times that of full-voltage starting

In (a.).When overhauling electrical equipment in a high-temperature environment, it should be avoided as much as possible to work under live conditions.

Calculated at the average speed:

e=blv=2*6*10/2=60v

1) In the experiment, the results can be obtained by directly measuring the current i2;

2) first find the power supply and resistance in the Thevenin equivalent circuit;

uab = i*r3 - us2； i = us1/(r1+r3)；

Then the open-circuit voltage Uoc = UAB, the equivalent resistance RO = R1 R3;

3) Take a power supply equal to UOC and a resistor equal to RO, and form the circuit in the following figure with R2;

4) The current i2 can be measured by calculation and experiment, and the results can be compared;