Fire fighting RCD, why it is needed and how to choose

During operation of the electrical network can be completely different contingencies. And one of such unpleasant situations is the leakage currents with a high enough value, which may well provoke a fire and subsequent fire.

In order to prevent such a situation, there is a fire RCD. In this article we will talk about how to properly perform a high quality protection with the RCD network.

Fire fighting RCD and ratings

Leakage currents may occur in almost any system, and the problem of fire RCD is to protect against a possible ignition wiring, instead of a pin of electric shock.

The thing is that the fire fighting the RCD (which is structurally no different from the usual) two parameters are significantly different from conventional RCD. Namely, the response time and a nominal leakage current.

Firefighters RCD leakage current starts at 100 mA, and there are 200 mA to 300 mA and 500 mA, even. And the most common denominations with operating currents: 40-100mA, 63-100mA, 63-300mA, 100-300mA.

Important. Fire RCD can not be used instead of the usual, as deadly to humans is considered to have a current of 30 mA, and at the minimum setting fire RCD 100 mA.

Connection of fire RCD

If you decide to install this safety device, then your network will look like this:

This two-tier system of differential protection, and it is the most common, although the three-tier system is used in some cases.

That a two-tier, three-tier system that has a serial connection protective devices where fire RCD is located in the direction of the supply line and the protective RCD (rated at 10mA or 30mA) is mounted closer to the source consumption. This embodiment provides protection highest possible level of protection not only human, but the whole system.

where used

Of course, it is desirable to use a fire RCD in every home, but of particular relevance in the application they get it in the timber (fire hazard) buildings. After all, if the wiring of the house is formed a leakage current, such as 500mA, when a voltage of 220 V the leakage will be exactly the same heat, if there is a small gas-burning burner.

I think there is so clear, the consequences of such heating in the wooden structure. And as you can imagine such a small amount of current, no machine simply does not shut off.

conclusion

How it might initially seem, fire RCD - redundant safety device. But, in my opinion, in the house where live your loved ones, the maximum protection should be provided, and therefore any safety device will not be superfluous.

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