An electric current is used to power all the appliances. It is safe for the equipment and for the person only under strict rules of protection against unauthorized appearance of stress on the body, or other live parts of household appliances. High degree of safety provided properly installed protective devices.
Some consumers believe that the more established Emergency circuit breakers are able to protect against electric shock. Unfortunately, this is a profound mistake. The machine is designed to protect equipment against overload and short circuit. He did not respond to current leakage on the housing. This role is performed by another type of protective device - RCD.
Connecting the RCD-wire network
This type of wiring is laid in the vast majority of modern apartments. One wire runs the phase current, and the other is attached to neutral. So choose the RCD with two inputs and two outputs.
Wiring Diagrams
There are two common ways to connect the RCD:
- One device for all current users;
- Separate RCD on each outlet.
In the first method (Fig. 1) a disconnecting device is installed after the induction machine. The advantage of this scheme is the savings in the acquisition of protection devices. A significant drawback - the device will disable the entire network in the event of leakage current to any load. In this case, the savings can not be justified.
It should be remembered that the RCDs guarantees the protection of home appliances against overloads and short circuits. Therefore, each line need to install circuit breakers corresponding to the nominal value.
Depending on the capacity that can be connected to the network, select appropriate parameters RCD. For the scheme proposed above is suitable in most cases, the device on the rated current of 60 A, configured for actuating current of about 100 mA.
If the apartment is ground, it is possible to set a higher operating current of the device. This will reduce the likelihood of false positives. If the ground is not present, this option is necessary to put a minimum, as the device will only work when there will be a touch to the body, in which the leakage current came.
RCD on each outlet
It is much preferable to establish a separate protection for each line wiring (Fig. 2).
Benefits:
- In case of damage of one of the lines of the other circuits will operate;
- Easier to find fault, because search is limited among a group of appliances included in the same outlet.
Disadvantage: need to buy several protective devices to be installed on each load group (Fig. 3).
Figure 3 shows an RCD circuit according to the distribution of current consumer groups. The idea is that we can choose denominations of devices that will provide maximum protection for different groups.
Another diagram shows two protection devices at the input. One of them protects the lighting circuit, and other groups protected outlets on the rooms (see. Fig. 4).
Please note that to leave the RCD several machines are connected to each line.
The advantage of the scheme is that the presence of leakage currents on the outlet line light continues to operate. Drawback - when troubleshooting you need to alternately turn on each load.