Before selecting the Uzo (protective disconnection device), it is necessary to determine its assignment. In the event of an emergency, the task of this switching device is timely inclusion or turning off the current. With proper installation and appropriate operation, the UZO protects the user from electricity lesion and prevents isolation fire.
Types of Uzo.
When an electric current leak occurs, the protective shutdown device automatically opens the network. This happens so instantly that a person does not have time to get an electric blow. The same UDO reaction will overheat and closing the wiring. The device will not allow wiring fire.
The protective shutdown devices are classified into two views, which each other differ from the type of leakage.
- A is an improved type that smoothly controls the stable operation of the power grid. Quickly responds to the appearance of AC and DC. It is great for use in everyday life. The protective shutdown devices of this type are suitable for rooms, where the operation of devices with several current views is concentrated. For example: computer, audio equipment, TV. Models with a "a" icon are distinguished by their high cost.
- The "AU" type controls the variable current network. It is significantly cheaper than the previous protective device of the type "A", however, its protective properties are significantly lower.
Application area
Compliance with the safety technique when working with electrical appliances is important both in domestic conditions and in production. Separate types of Uzo are suitable for working in small or large rooms and to meet the specific needs of users.
- For the apartment, the protection device for individual consumers of electricity, such as a washing machine or iron. The advantage of using such connections is that when a closure occurs, the current supply is terminated on a specific area of \u200b\u200bthe network, where damage arises. At the same time, the supply of electricity to other apartments does not stop.
- In some cases, the UZO is recycled by an electric shield in the apartment, in a separate room or in the enterprise. The price of this type of device is slightly lower. Despite this, it qualitatively provides uninterrupted control over the level of voltage and protects consumers from the occurrence of trouble. When the network closes, turning off the power supply occurs in the entire room. In this case, it is difficult to determine what kind of plot there was a closure.
Uzo and automatic devices
Before carrying out repair work with electrical wiring, there is a question that choose - a Uzo or a perifapeup, and maybe a circuit breaker? In order not to make a mistake in the selection, we offer you detail in detail with the characteristic of protective devices.
- The differential apparatus and the Uzo externally do not differ from each other. The difference is only in the functions performed. The perifape unit combines the circuit breaker and the RCD. Unlike the RCO, it protects the wiring from the closure, overvoltage and current leaks. If you simultaneously run all the electrical appliances in the house, I will not work for emergency overload network. As a result, the wiring and the device itself will burn.
The imported differential machine is cheaper than the protective shutdown device. Foreign appliances are high quality domestic - they are faster. The quality of materials and assembling imported devices above.
When the DIFAVTOMATA is triggered, it is sometimes difficult to determine what it was provoked by the breakdown: overvoltage, current leakage or closure. However, the latest models of these devices are equipped with indicators that are triggered to disconnect differential current.
This device is easily mounted. In case of breakdowns of a separate unit of the device, it must be completely replaced.
- The circuit breaker protects the line from overloads and short circuits. If your apartment simultaneously includes an electric oven and a heater, then during voltage jumps to prevent ignition and melting wiring, the circuit breaker will turn off the damaged line in a timely manner.
The difference between the machine from the Uzo is that the machine does not respond to a minor current leakage. However, the UZO does not protect the network from overloads.
Circuit breakers are single-pole, two-, three- and four-pole. The UZO, in turn, does not exist with one pole, it is produced with a minimum number of poles - from two to four.
How to choose an automatic and ed
If you do not know how to choose an automatic and Uzo, there are several tips that will help you orient you on the correct version of the safety device.
It follows from the indicators of the load level on the electrical wiring indoor, where it is assumed to install the RCD. Such devices are often designed to work in a single-phase or three-phase network. If there are no devices in the apartment that can overload the network, it is enough to purchase a capacity of 32 A. to work with a high load. It is recommended to use a three-pole RCD.
Before purchasing a protective device, you need to try it in the store. In each model, the "Test" button is provided, when the current leakage is impected. If the device is working, automatic shutdown will turn off.
Rules of installation of Uzo.
There are many types of protective shutdown devices that differ in each other characteristics, functions and purpose. To understand what a Uzo to choose for a particular room, you need to learn the councils of specialists:
- In residential buildings, where several sources of pulsating current (a powerful heater and computer) work, experts recommend to apply the "A" marking RCD.
- In the bathroom or shower, it is better to install a protective device in which the value of the trigger will be 10 mA. This is if the room is assigned a private line. When the overall line on the corridor, the kitchen and the bathroom - it is provided for the use of a circuit with a current to 30 mA.
- It is important that the UZO ensures the switching of the load chain, taking into account possible overloads.
- In the conditions of a large house or cottage, it is recommended to run four-pole devices to work. To maximize protection, you must install multiple differential current switches.
- Uzo must provide protection from over the current. Selecting the devices, you should pay attention to this parameter.
- The operation of the UZO with a leakage current of 30 mA and 10mA is aimed at saving a secure network for the user. To prevent ignition or damage to isolation, the leakage current must be at least 30mA, in the case of cascading networks - from 100 to 300m. In the bathrooms, where the likelihood of injury from electricity is great, it is necessary to use a 10 mA sensitivity.
- It is impractical placement of protective switches in a room with an old wiring, where the current leakage often occurs. As a result of frequent problems for malfunctions, the UDO may also work without reasons. Thus, it should be used to use sockets with built-in UzO.
Number of Uzo.
In order to decide how much the Uzo must be put, it is important to know how much you want to organize home wiring reliable and safe. To satisfy these needs, it is enough to connect 4 protective shutdown devices in one-room apartment:
- the room and the corridor is one device with a leakage current of 30 mA;
- the same device in the kitchen;
- for sockets in the bathroom, it is necessary to the UDO for a leakage current of 10 mA.
Thus, each socket in the room should have its own UzO. Such precautions will protect your accommodation from possible fire and damage to expensive property.
Calculation of Uzo.
To understand how to calculate the UZO, we suggest you to use the leakage current formula for a particular electrical appliance.
But before that it is important to determine the purpose of installing a protective device. Among the main goals can be allocated:
- fire protection;
- monitoring and preventing the leakage current;
- security for the life and health of the user.
The final leakage current indicator in the electrical appliance chain protected by a protective switch must be several times less than differential disconnecting current.
If the calculation rate for individual devices is equal to 10 mA - it is necessary to choose a RCD with a nominal differential current of 10 mA. Such RCOs are suitable for the bathroom. In other cases, you can use a device with a current of 30 mA.
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