How to connect the RCD-wire network

Probably no one would argue that in particularly hazardous areas Installation RCD is strictly necessary condition for safe operation. But on the RCD installed in the two-wire network or not, a consensus does not exist, because such an installation does not guarantee 100% protection of the person. Personally, I believe that any increase in the reliability and safety of the wiring is the appropriate solution. Therefore, in this article I'll look at the wiring diagram RCD-wire system.

The operating principle of the RCD

tripping device operates on the principle of comparing currents flowing in the phase and zero. And while their difference is zero - the relay is silent. Once the leakage current is formed in the network, then neutral wire begins to run less current than for the phase and when the difference reaches a setpoint parameter is shut down.

For example, you have an electric water heater. Inside it happened insulation damage, and now his body is under stress. You open the tap and begin to wash their hands, thus falls under the risk of damage. And under it will be exactly as long as it will relate to water flowing from a faulty boiler. This picture will be if you do not have an RCD.

If the protective device is mounted, in case of abnormal situation such as only a smaller current flows on the neutral conductor, network disconnection occurs, and you can feel only a slight tingling and will no longer be surprised by the sudden blackouts, not electric shock.

Important. Condition when the RCD will not turn off when a person touches the hands and zero phase, thus will It created a dangerous chain involving human subjects, but through the normal current flows RCD, which means that it will be silent. This is the only time when the RCD in the two-wire network will not protect you.

Connecting the RCD

Important. RCD will not protect your wiring from overload, so it must be mounted in conjunction with a circuit breaker or use RCBOs (RCD Machine and in one case).

Generally permissible to implement two versions of the connection. One of them is the installation of the RCD on all the wiring in the house.

But this device has the following disadvantages, namely: 40-50 mA devices are considerably more expensive than 30mA devices. And if there is a disconnection product it will be difficult to determine which network element triggered safety shutdown.

A second embodiment of connection assembly is less powerful RCD into different groups, e.g., sockets, lighting, bathroom and kitchen.

This option is of course more expensive than the previous one and requires a more complex installation, but it provides a more reliable operation of the entire system. And when triggered one of the devices you do not turn off the whole house, and de-energize only the damaged area and it will be easier to find the cause of the alarm.

Important. Select the RCD power slightly larger breakers. Because the unit shuts down the overload is not instantaneous, and all this time, a residual current device will be energized above its face value, and this can lead to the failure thereof.

Here are ways you can connect the RCD in your two-wire network. Thanks for attention.

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