How to change plug, step by step!

Do you know how to change an outlet? We always recommend that it is necessary to hire an electrician to perform the electrical activities to be carried out in your installation, however the task of changing an outlet is sometimes performed by people who are not trained in electricity, so there is little care. In this article we will teach you how to replace a socket and explain some safety procedures that must be performed before performing a socket change. Come on guys!

Power plug

The outlet is a connection point that supplies electrical power to a plug that will be connected to the outlet. Plugs are used to connect electrical and electronic devices to the outlet, thus supplying power to the devices.

The sockets are divided into two classes, TUG (general purpose socket) and TUE (specific use socket). Class TUG sockets are used for electrical and electronic devices with an electrical current of up to 10A maximum.

Class TUE sockets must have an independent circuit, as they are for electrical and electronic devices with electrical current above 10A and up to 20A. It is important to highlight the need to perform the appropriate dimensioning for each class of sockets, as the electrical current supported by the TUG and TUE sockets are different.

Outlet – Exchange

To change a socket , the first thing to do is to check the electrical voltage and current of the current socket, to know the specifications of the socket that will be used to replace the old socket. Always remember to correctly size the circuit for the socket.

To measure the electrical voltage of the socket, we will use a digital multimeter. First select the multimeter’s alternating voltage scale, then place a probe in the hole on the left of the outlet and the other probe in the hole on the right of the outlet or the other way around.

Measurement of electrical voltage of the socket.

Making the measurement with the multimeter we obtained the value of the electrical voltage of 127 volts , therefore our new outlet must support 127 volts. Now that we know the electrical voltage of the socket, we will identify the maximum current supported by that of the socket, to identify the electrical current that the future socket will have to support.

To know the maximum electrical current supported by that of the old socket, just look close to the holes, which usually informs the maximum electrical current supported by the socket and a good tip is that the 20A outlets have the holes with a larger diameter.

Near the holes, it usually reports the electric current.

The maximum electrical current supported by the outlet is 10 A, so the new outlet must support 10 A. If you cannot visually identify it, it will be necessary to dismantle the outlet.

In order to dismantle the socket, it is necessary to turn off the QDC circuit breaker responsible for the respective circuit of the socket, if you are unable to identify the correct circuit breaker of the sockets, the best option is to turn off the general circuit breaker or all circuit breakers.

Turn off the QDC circuit breaker responsible for the respective circuit from the outlet.

Now that we have identified and disconnected the circuit breaker from the outlets, for safety, always test one using a multimeter, voltage detector or test switch, to verify that there is really no electrical voltage in the outlet.

For safety, always test with a multimeter.

We are going to dismantle the socket, our socket is modular so it will not be necessary to completely remove the box, just remove the mirror and then the module of the socket with a screwdriver after the finishing plugs.

Lack of color pattern of the cables.

Disassembly of the modular socket.

The maximum electrical current of the outlet is usually on the side of the outlet, where it is also possible to see other types of information from the outlet, which help in choosing the outlet to be installed.

The outlet information is found on the side of the outlet.

When disassembling the socket, we noticed that the socket cables do not have a color pattern indicated by the NBR 5410 standard , this makes our service a little more difficult, as it will be necessary to identify which is the neutral cable between the two reds, as the socket has the correct terminals for connecting the cables.

To identify the neutral cable, keep the cables connected to the outlet. The procedure for identifying the neutral cable must be done with the circuit energized, so it will be necessary to turn on the circuit breaker responsible for the outlet circuit.

Now with a test switch or voltage detector, check which of the red cables is not electrically horny. When identifying the cable that has no electrical voltage, mark the cable with a black, blue insulating tape or brush, so as not to forget which is the neutral cable.

Identification of the neutral cable with electrical voltage detector.

After carrying out the identification and marking of the neutral cable, turn the circuit breaker off again and check again for electrical voltage at the socket. Never unplug the cables before switching off the circuit breaker again.

Now that we know all the necessary information, voltage, current, which is the neutral cable and with the plug circuit disconnected, we will change the plug. To change the socket, first remove the old socket by disconnecting the cables connected to the socket.

After removing the old plug, make the cable connections at the terminal corresponding to each cable. According to the new socket pattern, the hole on the left of the socket is where the neutral goes, the middle hole is for the earth cable and the hole on the right is where the phase cable goes. In the case of 220 V phase and phase sockets , the holes on the side are for phase and the ground goes in the middle.

The neutral left hole, the middle earth hole and the right phase hole.

The sockets usually come with an identification next to the terminal, indicating where each cable should be connected. In the socket of this example the neutral cable marked with blue ribbon must be connected to the terminal with the neutral identification, which is represented by the letter N. Then the earth cable must be connected to the central terminal of the socket, to finish connect the phase cable on the terminal with the phase identification, which is represented by the F / L symbol.

Cable connections at their appropriate terminals.

With the cables properly connected to the socket terminals, put the new socket module in place of the old socket module, then the mirror and the finishing plugs. Now that we have finished everything, we can turn on the circuit breaker responsible for the circuit of the sockets and test.

Finalization of the assembly of the socket, connection of the circuit breaker and socket test.

Changing the socket we saw the lack of standardization in the colors of the cables, below we have a video of the Mundo da Elétrica channel, talking about color standards for cables.v