How to divide the PEN conductor

As we know, the earth system TN-C It is outdated and banned for use. By the use of such systems are now recommended as a TN-C-S or TN-S. System TN-S extremely bad taking root in the former Soviet Union because of its high cost, but TN-C-S quite well used. But the main condition of efficiency of this type of ground is splitting PEN conductor to PE and N. And how to do it by all the rules and I'll tell you in this material.

Why do we need a conductor separation

Before you find out how the division is made, let us understand why we need it. The first is it is our safety, provision of which requires not only common sense, but also technical documents, namely the SEP 7 edition:

At this point, clearly stated that all electrical installations with voltage of 220 before 380 We are required to have the grounding system TN-S or TN-C-SAs well as the TN-S almost never used in Russia, it remains TN-C-S. And it is in this embodiment is required splitting PEN conductor.

Terms separation PEN conductor according RB

These rules are spelled out in the PUE sections 1.7 and 7.1

1. Split PEN the conductor must take place before any switching device (such as an introductory machine). When this wire is seated directly on the separating bar, which also connects to the zero and earthing strap.

It turns out that such action is necessary to perform a metering device, and certainly not after.

2. The cross section of the branch conductors should be identical.

3. Later forbidden to re-connect to a single point separated conductors.

4. Prohibited use one bus to N, and PE conductors, so do it right:

5. It is also desirable to perform the re-ground directly at the input.

6. It is strictly forbidden to use any of the switching devices in chains PEN, and PE conductors.

Grounding TN-C-S in private households

To implement such a system in a private home is fairly easy for both single-phase and three-phase input. It's enough to make a high-quality home ground. And in the opening panel to make this splitting.

But the owners of the apartments is much more complicated.

Grounding TN-C-S in apartment

In order to perform such a system in your own apartment, you will need to wait for the moment when the management company does not comply with the reconstruction MCR (Main control board) where specialists would be produced cleavage PEN conductor and grounding and is already working zero (individual wires) are not wound up in your story Distributive boxes.

If you have already completed the reconstruction of its own wiring, and brought up in the panel ground wire, then he still "hanging in the air" until the company do in the splitting MCR. More options you do not.

conclusions

Now that you know how to perform proper digestion conductor PEN in the grounding system TN-C-S.

Thank you for your valuable attention!