PEN Division, 4-Pole Surge Arrester Use in TNC-S Network: Is Image & Connection Correct?

Question

Hello I have a question about the PEN division and the use of a 4-pole surge arrester in the TNC-S network. Is what the picture shows okay? I mean the PEN division at the input to the switchgear, then the PE to the PE bus which will be earthed to the hoop also located in the switchgear and...

retrofood · Accepted Answer

Overvoltage limiters. What is this? Are they essential in every home?

retrofood · Accepted Answer

Each protector is supplied with the manufacturer's instructions. So you should first check if what you bought is intended for the type of network you have, and if so, the required connection method is shown in the drawings.

mawerix123 · Answer

What is this protector :?:

how did you pick it up :?:

It's yellow-green in the lower right corner of where it will be mounted :?:

What is this object and what does its power supply look like apart from this 4x10 cable :?:

semper fidelis1 · Answer

The PE rail is also originally installed in the switchgear at the bottom (I have Legrand).

It will be a single-family house. It is the main separation, then there will be 5 pcs.

Counter protection C25.

The ABB B + C protector was recommended to me in an electrical store and there was nothing else on the project except that there should be a B and C protector.

mawerix123 · Answer

You have not written how the house is powered, overhead or cable, and how long the 4x10 section is.
The house has a lightning protection system :?:

semper fidelis1 wrote:
The ABB B + C protector was recommended to me in an electrical store

Because it had been lying on the shelf for too long

they should recommend a TN-C protector but they probably didn't have one

semper fidelis1 · Answer

That's right, they didn't have 3 poles, but what's the difference? I can't connect anything to N?

Not exactly like the picture below.

My power supply is earth, some 25m connection, then it is connected to the overhead line.

There will be no lightning protection - at least for now and you will brighten me up, what will it change? The earthing hoop is connected to the earth ring around the house with the 4x32 hoop.

mawerix123 · Answer

In my opinion, you should have an arrestor based on a magneto.

In my opinion, this limiter is not suitable for home limp 7kA, laughs are the worst, they have about 20kA, although these are stretched values because at 8/20 where the 7kA is 10/350 and it seems it is a T1 (B) type protector and not B + C.

With the amount you invested in ABB, you would probably buy the right one.

semper fidelis1 · Answer

No, you have T1 + T2 written on it, I invested less than PLN 500 in it, I do not know what would be the right one, the electrician wanted to give me some Chinese for PLN 250, I thought I would buy a better one, I did not analyze it like you because I honestly don't know much about protectors. One more thing in the project is that the ZE provides type I protection.
Regardless of it, is the connection method correct? Should this N finally be connected to the protector or just leave it empty? If it was not, the protector is already for the division, I know there should also be N connected.

semper fidelis1 · Answer

Very nice article and well-written that the knowledge about when and what to use by electricians is very general, to put it mildly, most of them choose the cheap one, the customer is satisfied, the cash register agrees. I wouldn't see any further what kind of protector to use and I won't insist, but I'm not saying mine is bad anyway. However, this was not what I wanted to ask if the model is good, I could draw a square and sign it because I only mean the connections - I also had the opinion that the PE should be first to the protector and then to the PE rails, for example, but I don't know if it's the best idea.

If someone thinks that my protector is bad, I spent money unnecessarily, I will be happy to hear what it should be - you can always replace it.

CYRUS2 · Answer

If there is a break in the PEN in the overhead network, the receivers will also be damaged. The protectors will not work for this. Better power limiter, w or D25. D25 is an opportunity for short circuit selectivity

retrofood · Answer

But it is not the author who specifies the type of security. It does in terms of attachment.

CYRUS2 · Answer

The amperage is the same. Power limits the same.

PEN Division, 4-Pole Surge Arrester Use in TNC-S Network: Is Image & Connection Correct?

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