Hello gentlemen! I have a question about connecting a surge arrester with a residual current device. Is the given scheme correct? I mean the switchgear itself in the building: surge arrestor -> residual current circuit breaker -> overcurrent circuit breaker -> receiver. Regards

It is not correct, there is no disconnector and the PEN must not be separated on the apparatus. For this, this protector is not intended for TN-C networks

So this connection will be correct?

Protector behind the disconnector and grounding to the PEN bus, N bus not required. By the way, RCD is necessary

Let a friend take it so logically. How to replace the insert in the limiter when the voltage cannot be removed effectively? As a reminder, the switch disconnector did not take the name from the pins.

And some counter, pre-meter security? I think they are

Nonsense, this is a disconnector to disconnect the entire switchgear and not selected circuits. In addition, the arrester is to protect installations even if FR is switched off.

Note that a colleague writes about the receiver and paints the engine. The motor rather protector does not need a different receiver, however, may need an N bus. As usual, residual information and a request for help.

Is the engine not a receiver? In addition, I drew briefly, I mainly meant the limiter itself and the RCD. I will not draw all the socket and lighting circuits. Gentlemen, I mean the idea!

Well, you have everything written. Working behind an RCD turned off or a circuit breaker is an unnecessary risk and stress. A colleague has never heard of glued contacts?

Hello I read this topic because I face a similar dilemma myself. If there are BM protections in the sequence in front of the meter, then a power limiter, a meter, you can put a surge arrester after it, then a switch disconnector and all the rest? There are different schools. What do colleagues think about this? I am asking because I want to split it into two circuits, each one on a different level, behind the limiter. Each floor, circuit would start with a switch disconnector.

Correct Connection: Surge Arrester -> Residual Current Device -> Overcurrent Circuit Breaker

piomar93 40404 12

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#1 17120752 22 Mar 2018 17:27

piomar93 piomar93

Level 5

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Post #1
17120752 22 Mar 2018 17:27

Hello gentlemen!
I have a question about connecting a surge arrester with a residual current device. Is the given scheme correct? I mean the switchgear itself in the building: surge arrestor -> residual current circuit breaker -> overcurrent circuit breaker -> receiver.

Regards
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#2 17120766 22 Mar 2018 17:33

mawerix123 mawerix123

Level 39

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Post #2
17120766 22 Mar 2018 17:33

It is not correct, there is no disconnector and the PEN must not be separated on the apparatus. For this, this protector is not intended for TN-C networks
#3 17129449 26 Mar 2018 18:24

piomar93 piomar93

Level 5

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Post #3
17129449 26 Mar 2018 18:24

So this connection will be correct?
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#4 17129472 26 Mar 2018 18:35

mawerix123 mawerix123

Level 39

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Post #4
17129472 26 Mar 2018 18:35

Protector behind the disconnector and grounding to the PEN bus, N bus not required.
By the way, RCD is necessary
#5 17130404 27 Mar 2018 01:34

pol102 pol102

VIP Meritorious for electroda.pl

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Post #5
17130404 27 Mar 2018 01:34

piomar93 wrote:
So this connection will be correct?

Let a friend take it so logically. How to replace the insert in the limiter when the voltage cannot be removed effectively? As a reminder, the switch disconnector did not take the name from the "pins".
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#6 17130793 27 Mar 2018 11:03

Brivido Brivido

Company Account
Level 34

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Post #6
17130793 27 Mar 2018 11:03

pol102 wrote:

piomar93 wrote:
So this connection will be correct?

Let a friend take it so logically. How to replace the insert in the limiter when the voltage cannot be removed effectively? As a reminder, the switch disconnector did not take the name from the "pins".

And some counter, pre-meter security? I think they are
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#7 17131205 27 Mar 2018 14:42

Łukasz-O Łukasz-O

Admin of electroenergetics

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Post #7
17131205 27 Mar 2018 14:42

Brivido wrote:

And some counter, pre-meter security? I think they are

Nonsense, this is a disconnector to disconnect the entire switchgear and not selected circuits.
In addition, the arrester is to protect installations even if FR is switched off.
#8 17131379 27 Mar 2018 16:05

kortyleski kortyleski

Level 43

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Post #8
17131379 27 Mar 2018 16:05

mawerix123 wrote:
, N rail not required.

Note that a colleague writes about the receiver and paints the engine. The motor rather protector does not need a different receiver, however, may need an N bus. As usual, residual information and a request for help.
#9 17131392 27 Mar 2018 16:13

piomar93 piomar93

Level 5

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Post #9
17131392 27 Mar 2018 16:13

Is the engine not a receiver? In addition, I drew briefly, I mainly meant the limiter itself and the RCD. I will not draw all the socket and lighting circuits. Gentlemen, I mean the idea!
#10 17132553 28 Mar 2018 03:12

pol102 pol102

VIP Meritorious for electroda.pl

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Post #10
17132553 28 Mar 2018 03:12

Well, you have everything written. Working behind an RCD turned off or a circuit breaker is an unnecessary risk and stress. A colleague has never heard of glued contacts?
#11 20161899 26 Aug 2022 14:24

PIOTREL PIOTREL

Level 26

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Post #11
20161899 26 Aug 2022 14:24

Hello
I read this topic because I face a similar dilemma myself.
If there are BM protections in the sequence in front of the meter, then a power limiter, a meter, you can put a surge arrester after it, then a switch disconnector and all the rest? There are different schools. What do colleagues think about this?
I am asking because I want to split it into two circuits, each one on a different level, behind the limiter. Each floor, circuit would start with a switch disconnector.
#12 20161909 26 Aug 2022 14:31

Łukasz-O Łukasz-O

Admin of electroenergetics

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Post #12
20161909 26 Aug 2022 14:31

There is only one school. The limiter is to be behind FR.
#13 20161923 26 Aug 2022 14:44

PIOTREL PIOTREL

Level 26

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Post #13
20161923 26 Aug 2022 14:44

So in my case, I would have to install two surge arresters for each floor.
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Topic summary

The discussion revolves around the correct connection sequence of a surge arrester, residual current device (RCD), and overcurrent circuit breaker in electrical installations. Initial responses indicate that the proposed connection lacks a disconnector and improperly separates the PEN conductor, which is not suitable for TN-C networks. Subsequent replies emphasize the necessity of placing the surge arrester after a disconnector and grounding it to the PEN bus. The importance of RCDs is highlighted, with concerns about operational risks when devices are not properly isolated. The conversation also touches on the need for multiple surge arresters when splitting circuits across different levels in a building.
Summary generated by the language model.