The main condition for the operation of the power supply system is to ensure the safety of human life. Various devices are provided for this purpose, but the most important is the RCD . If you live in the capital, then to install it you need to call an electrician in Moscow . In fact, this equipment is installed immediately when laying the central highway. To understand its importance, you should get to know the device better.
Key Features
Imagine a situation when a washing machine is turned on and the insulation of its wiring has been damaged. In this case, there is a short circuit to the case. If a person touches it with an open part of the body, then he can receive a strong electric shock. To prevent this situation, an RCD was invented. The principle of operation is based on measuring, as well as comparing the strength of the outgoing and incoming current. In total, it should be zero. If the system malfunctions, that is, the difference is "0" and the phase changes, the mechanism instantly reacts to this and opens the circuit. The construction is based on a transformer .
When the unit is in good condition, the overall amperage readings are zero. In case of insulation failure and leakage, this potential changes and an electromagnetic field arises in the secondary winding. Under its influence, the metal strip of the switch is attracted, which is connected to the relay. After transmitting the impulse, it instantly triggers and opens the circuit. To install the equipment, you will need the services of a private electrician . It is installed after the circuit breakers and directly in front of the meter. Wire is connected to its input and output using special terminals: phase, zero, ground. They are then pulled into the living area to the junction box or power consumption points.
Types of RCDs
There are different types of devices. For example, equipment in category AC provides safety and is triggered by DC leakage. It is present in all systems that are installed in residential buildings and industrial facilities. But modern household equipment is supplied with rectifiers that convert voltage, giving it constant performance. In this case, a category A device comes to the rescue. It costs a little more, but has a wider functionality. Recently, you can find devices that are mounted directly into sockets or come complete with a plug. They are very convenient, as they do not require additional wiring, which can be significantly saved on. Regardless of what equipment was chosen, its presence will ensure safety and save life of a person.
