- Why RCD?
- Connection Methods RCD RCD
- Connection in the apartment and a private home
If your apartment has a large number of household appliances, then you necessarily should install such a device as the RCD.Otherwise, all appliances will be under the greatest threat.If you have not encountered this question, we hope that this article will shed some light on how to connect the RCD.But first, let's understand why you need this machine.
Installation RCD is required for several reasons.Mostly, it was designed to protect.From What?Firstly, the RCD protects people against their shock, especially in cases where there are faults in the installation.Second, the device is activated and off RCD current because of accidental or erroneous contact with live parts of electrical installations, in case when there is a leakage.And, thirdly, the RCD prevent ignition wiring in the event of closure.As seen from the above, this machine actually performs an essential function.
today can meet the differential RCD machines, which feature is to combine the circuit breaker and the RCD.Their advantage lies in the fact that the plate takes up less space.In all cases, when you connect the RCD all contact connections must be supplied to him not from below but from above only.One of the reasons is more aesthetically pleasing form.But there is a much more important reason.The fact that the RCD is able to reduce the efficiency of the work of all household items.Moreover, during repair work electrician will not be confused, and he did not have to learn complicated, intricate schemes.So now it's time to consider options for connecting the RCD.
Connection Methods RCD
are four ways to connect the RCD:
- connection to the single-phase two-pole RCD network.
- connection to the three-phase four-pole RCD network with neutral.
- connection to the three-phase four-pole RCD network without neutral.
- connection four-pole RCD-phase network.
consider each case individually.
connection to the single-phase two-pole RCD network
Bipolar RCD to the single-phase network
Among all these connection methods, it is, perhaps, the most common pattern.When it is connected no complex momentum.Moreover, such an RCD can be connected independently.For this purpose, the body or in the passport you need to know exactly where the machine is located in the neutral or zero, and the phase.As a rule, the machine shown such signs 1.2 and 1 N. - means coming phase conductor 2 - coming phase conductor and N is zero or neutral.
There were times when the RCD fails.Why is that?The fact is that the current passed through it exceeds its rated operating current.To this was not in your case, buy RCD with a greater nominal operating current.Furthermore, when connecting important to observe the correct sequence.Otherwise, during its operation problems may occur.For example, if you connect to confuse the terminals with a zero phase, the RCD immediately fails.
connection to the three-phase four-pole RCD network with neutral
Four-RCD three phase, neutral
This method of connecting the RCD is also quite common.The principle of its connection is virtually no different from the single-phase network.Only in this case mounted tetra RCD.It has four incoming wires that on the machine are indicated as A, B, C and zero (N).As a rule, wiring diagram indicated on the housing of the machine.The only difference may be that the four-pole RCD to zero can be located on the other side.Most importantly, properly connect the inputs and outputs.
Such RCDs are used for fire protection wiring for large leakage currents.If you use it for protection against electric shock a person, it is recommended to use the point of the leak, which is equal to 10 to 30 mA.
To protect itself, the RCD is mounted directly in front of the circuit breaker.
when connecting it is essential to comply with the color-coded wires, and connect the zero and phase conductor.
connection to the three-phase four-pole RCD network without neutral
Connecting to a three-phase network without neutral
This scheme is used in most cases to connect the three-phase motors.RCD disconnect it from the network as soon as there a small circuit winding.To connect the three-phase motors must be three-phase voltage, namely A, B and C. You will also need the protective conductor PE, which will serve as the chassis ground.As a result, it makes no sense to buy five-wire cable, but rather will be four strands.
connection four-pole single phase RCD
This use of the RCD can be considered irrational and appropriate.However, in some cases, it is the only right decision.For example, if in the future you are planning to expand the wiring, moving it to a three-phase network, or add a few single-phase networks.Moreover, such a scheme is used in cases of temporary use of the emergency replacement of a faulty two-pole RCD.Connect simply passes.For this zero phase and is connected to the corresponding terminal.In this connection the phase conductor to the terminal is carried out only in the case if you are connected at this time "Test" button.This terminal is located close to zero.
Connecting the RCD in the apartment and a private home
Wiring RCD in the apartment is carried out only by a single-phase network.For this reason, the connection is made in the following order:
- Prologue machine.
- RCD 30 mA.
- electrical wiring in the apartment.
Connection in the apartment
As far as connectivity RCD machine in a private home, the sequence of the following connections:
- Prologue machine.
- RCD 100 to 300 mA, the choice is made depending on the amount of current consumption of all household appliances.
- RCD for individual consumption current.Typically used RCD 10 to 30 mA.
So we reviewed with you some of the features and differences between the RCD connection in certain circumstances.Most importantly, remember that if you have no idea of all this system, it is better not to experiment.
few words about the typical mistakes when connecting the RCD: