Electricians have been arguing for a long time: which grounding system is better? I am showing a solution that will suit everyone.

Of course, it is not the business of a beginner to teach professionals, but until he himself figured out this question, he has not found a concrete answer.

Friends, a big hello to everyone. Writing articles about electrical engineering while being an absolute amateur beginner is a big responsibility. Of course, I am preparing for this as best I can, but still I expect leniency from you, especially regarding professional terms. The essence is more important to me (I hope for you too) ...

Protective grounding is an important part of wiring in any home.

With this, I think, no one will argue. The issue of grounding my house, I decided last year.

And the most difficult thing was to make a choice.

I come across this periodically at every stage of construction.

This problem arises again... When there are a bunch of options, but there is no one specific solution.

So I had to analyze the information myself and make a decision.

What to choose from?

I will speak specifically about private houses. And now the most common are two grounding systems.

1. TN-C-S

• Here, a 4-core cable (in the case of three phases) is suitable from the transformer in the house - three phases and one neutral wire, which is both working and protective.
• Already at the entrance to the house, the zero (PEN) wire is divided into two separate ones: a working zero and a protective one. In this case, for the latter, re-grounding is done (this role is played by grounding on the supports).

This system is good for which does not require additional costs for the arrangement.

But the main disadvantage is the possibility of breaking a zero on the line before entering the house. In this case, all grounded elements can be under phase load.

2. TT system.

Here, the zero wire that comes into the house is only a working one, and it remains so (it is not disconnected for anything). And the role of protective grounding is performed by a separate circuit, which must be equipped independently.

• Here, the reliability of power lines is not important. No breaks will affect the protection.
• But at the same time, the quality of the constructed ground loop matters. You also need to periodically monitor its performance.

It turns out that in any case there are risks.

So what choice should you make?

My answer is any!

✅ But at the same time it is necessary to make a mandatory addition - this is differential protection. It is provided by special automatics (RCDs, difavtomats), which are installed in the electrical panel.

This equipment monitors leakage current. And if these leaks are on the device body (and further into the ground), then the automatics will turn off the voltage.

And most importantly, even if the grounding fails for some reason, this protection will also work if the dangerous potential goes to a person (the main thing here is to choose the right devices).

A TT system is made in my house.

There is differential protection on the water switchboard, and there will also be separate RCDs (for each phase, and rooms of increased danger).

It seems to me that there is never too much protection 😎.

Friends, subscribe to the channel, and like it 👍. All the details on the electrical installation in my house are yet to come. Well, I'm waiting for your opinion and advice in the comments ...