Connecting 4th PE/N Contact to Star-Connected 3-Phase Motor: Differential Functionality

Hello.
I have a problem with connecting a 3 phase motor. The nameplate says star connection. There are only 4 contacts to connect (phase I know how) while the fourth contact is connected to the motor housing. The whole device is metal, moreover, a yellow-green cable connected to the structure. What should go under the 4th PE or N contact so that the differential works correctly?
In the attachments, the motor's contacts are grounded on the bottom right, and the motor's nameplate

You need to connect PE. If you connect N, the RCD will work. The three-phase motor does not need N. However, it must be grounded, therefore PE to the housing. The situation changes when there is no differential, then we connect N.

Moderated By Łukasz-O:

The neutral wire has never been used and will not be used for electric shock protection.
3.1.11. They are misleading, dangerous or do not solve the user's problem.
Warning #1.

This motor does not need a N wire to operate.
You connect the PE wire to the motor housing.

wodzu_1 wrote:

The situation changes when there is no differential, then we connect N.

No, nothing changes, we still connect PE to the housing despite the lack of a residual current device.
Never connect the N wire to the housing, or you can connect the PEN or neutral wire, if there is one in the installation.

wodzu_1 wrote:

The situation changes when there is no differential, then we connect N.

Badly. Then we also connect PE.

masonry wrote:

when there is no differential, then we connect N.

The author of the post did not specify the network layout.
In most old installations, N (zero) was connected to the housing, unless the motor was grounded locally.
A fifth wire was added to the new system.
It is known that the motor housing must be grounded.

Remember buddy once and for all the N wire and the neutral wire are two different wires.
I will write again, the N wire was never connected to the housing.
Also, do not confuse the ground function with the PE conductor.

wodzu_1 wrote:

In most old installations, N (zero) was connected to the housing, unless the motor was grounded locally.

Stop.
The layout of the network does not matter, and the N conductor has never been and cannot be used to protect against electric shock.

The question is: is an RCD in this case necessary, and can the motor be directly connected to the common network?

masonry wrote:

when there is no differential, then we connect N.

Correct the citation first because the masonry did not write this nonsense, only you.

wodzu_1 wrote:

In most old installations, N (zero) was connected to the housing

N is not "zero". Zero is the old name of the PEN conductor, which simultaneously performs a neutral and protective function, despite the fact that it does not meet the current requirements regarding the cross-section.

zbich70 wrote:

Correct the citation first because the masonry did not write this nonsense, only you.

As a courtesy, "you" is capitalized.
My mistake, I misquoted the thread.
The author of the post asked which wire should be connected to the motor housing.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

The answer was EP.
Each motor must be grounded.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

When there were no differentials, what was connected to the motor housing?
Nulling was used. The current solution separates N from PEN.
The author of the post wanted to connect a three-phase motor with a four-wire cable to the new installation and clearly mentioned that it should work with a residual current device and certainly had a problem: the motor housing to N or PE.
My question: if I connect in a plugin to N , will it work?
How to connect to PE....
Residual current devices should be used at each modernization of the electrical installation.
However, there are many installations without these switches.
However, life and being healthy is priceless, it should be used as such.

wodzu_1 wrote:

Residual current devices should be used at each modernization of the electrical installation.

Yes?
Then please provide the basis for this "should", i.e. precisely specify where such an obligation exists.

For your own good.
Nobody will bring us back.

wodzu_1 wrote:

Residual current devices should be used at each modernization of the electrical installation.

A friend knows he's calling somewhere, but he has no idea where.

wodzu_1 wrote:

However, there are many installations without these switches.
However, life and being healthy is priceless, it should be used as such.

So why does my colleague write that if there is no RCD, N should be connected to the housing, which in some cases can be dangerous.

The RCD was not and will not be a panacea for all evils. In a properly made installation, it is practically unnecessary, and is, moreover, an additional means of protection.

The engine is Soviet and probably "age".
It has a drawing of a star.
On 3 wires in a star system - think a bit.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

So many posts and no replies.
1000 pts rewards for a friend who will give an answer on how to solve this problem.
The solution is very simple.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

500 pts rewards for a friend who explains the topic to the author. why in this case the RCD will not work.

CYRUS2 wrote:

The engine is Soviet and probably "age".
It has a drawing of a star.
On 3 wires in a star system - think a bit.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

So many posts and no replies.
1000 pts rewards for a friend who will give an answer on how to solve this problem.
The solution is very simple.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

500 pts prizes for a friend who explains the topic to the author. why in this case the RCD will not work.

Yes, we think.
It is an asynchronous motor (asynchronous propeller) for the voltage of 380 V with the connection of the windings inside the motor in a star system, therefore 3 wires are led out.
Connect the protective conductor under the housing terminal.

Is that the philosophy, buddy CYRUS?

Oh, give your /simple/ solution.

CYRUS2 wrote:

On 3 wires in a star system - think a bit.

How many wires does a friend need for a star?
The answer is in post 3.

masonry wrote:

CYRUS2 wrote:

On 3 wires in a star system - think a bit.

How many wires does a friend need for a star?

Probably 6 to make bridges

kortyleski wrote:

The RCD was not and will not be a panacea for all evils. In a properly made installation, it is practically unnecessary, and is, moreover, an additional means of protection.

That's why in new installations it is necessary.
The approved construction design requires the use of a circuit breaker, residual current devices in the recipient's installation and we should ignore it? I'm asking why?
The author of the post certainly has this differential in his installation.
Colleagues, will the engine work if we connect N (in the plug) to its housing?
Then what do we connect when we have a 4-wire cable, as the author asked?
The discussion turned into theoretical considerations.
Please specify two ways to connect the motor:
1-system with a differential,
2-chip without differential.

rafal2893 wrote:

What should go under the 4th PE or N contact so that the differential works correctly?

Will someone finally answer?

Yes.
In both cases, we connect the PE conductor to the housing.
The answers have already been given.
However, the legitimacy of using the RCD in this system is given PN-HD 60364-4-41 .

WojcikW wrote:

Don't write nonsense. Practically a newly built industrial plant and there is no RCD on any motor circuit. Of course, the plant has been operating for several years.

WojcikW wrote:

Don't write nonsense. Practically a newly built industrial plant and there is no RCD on any motor circuit. Of course, the plant has been operating for several years.

If so in the project.
When carrying out electrical installations in the project, I have a residual current device, so I must use it. Yes or no?

wodzu_1 wrote:

WojcikW wrote:

Don't write nonsense. Practically a newly built industrial plant and there is no RCD on any motor circuit. Of course, the plant has been operating for several years.

If so in the project.
When performing electrical installations in the project, I have a residual current device, so I must use it. Yes or no?

Did the design take into account the presence of this engine?

wodzu_1 wrote:

Then what do we connect when we have a 4-wire cable, as the author asked?
The discussion turned into theoretical considerations.
Please specify two ways to connect the motor:
1-system with a differential,
2-chip without differential.

The answer to the author's question was in post #3.
Post #3 also has an answer to your questions, you just either missed it or are unable to understand it.
You have no idea about electrical installations, and you are trying to suggest.
These are not theoretical considerations, as you write, but practical ones.
For you and for the layman, the only interpretation of a good connection is that the motor works, for us it is important that the device works safely.
Where and when an RCD should be used is described in the standards and referenced in the regulation, making it a legal requirement.
You won't understand what's going on until you understand the functions of the N, PE, PEN and zero wires and what is grounding.
Several good electricians with a lot of practical and theoretical knowledge have spoken in this thread, and you are still pushing your imaginary ideas.

masonry wrote:

The answer to the author's question was in post #3.
Post #3 also has an answer to your questions, you just either missed it or are unable to understand it.
You have no idea about electrical installations, and you are trying to suggest.
These are not theoretical considerations, as you write, but practical ones.
For you and for the layman, the only interpretation of a good connection is that the motor works, for us it is important that the device works safely.
Where and when an RCD should be used is described in the standards and referenced in the regulation, making it a legal requirement.
You won't understand what's going on until you understand the functions of the N, PE, PEN and zero conductors and what is earthing.
Several good electricians with a lot of practical and theoretical knowledge have spoken in this thread, and you are still pushing your imaginary ideas.

In fact, I don't need to summarize the thread anymore, because everything is in the quoted post.
It remains only to close the topic with a patent padlock.