Earthing system TN-S type

Today, the system TN-S is considered the most reliable and secure. That is why the SEP in the reconstruction of old and construction of new buildings, mount it earthing system TN-S. In this article I will tell you what is the TN-SAs well as talk about the positive and negative aspects of the system.

In European countries, this system replaces the simpler and cheaper ground system TN-C in the early 40-ies of the last century, but due to the economic component is not caught in the USSR and is being implemented very slowly in Russia today.

The peculiarity of this system

The main feature of the energy transfer in such a system is that in three-phase networks, you will have five wires phases: BUT, IN, FROM working zero PN and grounding PE.

Scheme grounding type TN-S as follows

It turns out that all overhead lines are required to have as many as five wires, instead of four under the system TN-C.

In this fifth wire PE It performs a purely protective function. Also when such a system ground wiring from the end user should be made three-core cable: phase working zero, protective ground.

Obvious advantages of the system TN-S

The positive aspects of the use of the grounding system TN-S It includes the fact that there is guaranteed a higher degree due to electrical grade applications such as the protective device RCD.

And it will work not only with the human touch to the body electrical stranded under stress, but also disable the damaged area immediately in the event of breakdown of the insulation without person.

In addition, in such a system there is no strict requirement for additional grounding circuit, which was required to maintain a permanent technical control.

Just as there is no need to perform separate grounded metal housings of electrical appliances.

In such a system there is no so-called high-frequency induced noise, which has a positive impact on the health of sensitive electrical appliances.

Disadvantages system TN-S

Minus one such system and it is connected primarily with the finances. In order to fully translate the energy system on a system, it is necessary to reconstruct completely all existing power lines. That is why Russia is much promising is the use of the system TN-C-SAbout which it is written in detail on my channel.

How to move to a system

Of course, many will want to best protect their homes and realize a grounding system. Wait until will be adopted and implemented a federal program for the reconstruction of networks can be very long, so the owners of private households have access to the form of implementation of the grounding system TN-C-S. After all, this system is just combines TN-C and TN-S and meets all modern requirements of the SAE.

That's all I wanted to tell you about a very reliable but expensive grounding system TN-S.

Thank you for your valuable attention.