Which is better to put: difavtomat or RCD?
Residual Current Device, which is often called a differential switch or a differential switch, serves to turn off the electricity in the network when a leakage current occurs. This problem may occur if the cable is damaged. If you do not protect yourself from leakage currents, then a person may be injured by electric current, as well as spontaneous combustion of the wiring (it begins to melt) and, as a result, a short circuit.
Difavtomat - This is an RCD connected to a circuit breaker. The device is used to protect against leakage currents, as well as to prevent overloading the wiring and its damage during a short circuit (the last two functions are the main purpose of circuit breaker).
Summing up, we can say that a differential circuit breaker is, roughly speaking, an RCD + automatic machine. Now let's talk about which device is better to choose when installation of electrical wiring in the house.
Advantages and disadvantages
Having learned the differences between the two devices, the idea immediately arises that it is necessary to choose the second embodiment. This is a hasty conclusion, because if the RCD is additionally protected by a circuit breaker, then, in fact, this will be a differential machine. Therefore, in order to already say for sure that it is better to choose an RCD or a differet machine, it is necessary to determine the advantages and disadvantages of each product.
The advantage of the combined model is that it is compact (does not take up much space in the electrical panel), and also completely protects the wiring from various kinds of dangers. In addition, the cost is slightly less than the purchase of an RCD + machine, and installation is faster (you need to tighten a few screws less).
The main disadvantages are:
- If the difavtomat fails, it will be necessary to acquire a new one. We immediately draw your attention to the fact that in case of a breakdown of the RCD + automatic combination, only one product will need to be replaced, because extremely rarely two immediately break. Like it or not, a single item will cost less than a combined option.
- When disconnecting, it is difficult to understand the reason: the occurrence of short circuit, leakage current or network congestion. In the case of shared devices, the reason is much easier to find out: knocked out AV - short circuit or overload, knocked out RCD - current leakage.
The advantages and disadvantages of a separate version can be derived based on the pros and cons of the previous device, namely:
- buying a new product will be cheaper;
- it is easier to identify a breakdown;
- install longer;
- takes up more space on the DIN rail;
- lack of protection against short circuit and overload if the circuit breaker is absent.
Well, the last thing I would like to talk about is that it’s better to choose and put it in the house: an RCD or a difavtomat.
Which is better to install?
You familiarized yourself with the purpose, advantages and disadvantages of each device. If you still do not understand the answer, let’s summarize by choice.
If you exercise installation of electrical wiring in the apartment or a house with a simple wiring diagram, it is permissible to install only a difavtomat. When creating a complex network in a cottage, it is better to use several RCDs with AVs for each group of wires (sockets, for lighting, for powerful electrical appliances, etc.). To protect a separate network with low power consumption, a difavtomat can not be installed, but it is enough to secure the line with only a residual current device.
We draw your attention to the fact that the functionality of both options is the same, so you can not give preference to one of the devices based on its performance!
To your attention a video on which the difference is clearly explained:
That was all I wanted to tell you about the two protective devices. We hope that now you know for sure that it is better to choose an RCD or a difavtomat for a private house and apartment.