How to check with a meter which cable is 0 and which is phase

Hi,
I have a UNIT-T UT 33C meter and I would like to check which wire is phase and which is 0.
Could someone instruct me on how to do this?

Here is my meter.

Preferably a neon indicator.

Added after 36 [seconds]:

And in what installation?

kaz69 wrote:

Preferably a neon indicator.

Added after 36 [seconds]:

And in what installation?

Installation in an apartment. There is a fuse box in the apartment. I want to connect the meter cables to two of the 3 inputs, how to set the meter to what position and how to measure it.

Make a measurement between a grounded point (e.g. a water or central heating pipe) and the tested conductors in the range of 500V alternating voltage. The highest value of the indication applies to the phase wire, ie approx. 230V.

Sniezynka wrote:

Make a measurement between a grounded point (e.g. water or central heating pipe) and the tested conductors in the 500V AC range. The highest value of the indication applies to the phase wire, ie approx. 230V.

Exactly so, take a measurement and report the results

Give me a photo of this mailbox

Below, there is a box and ... a socket that the builders connected to the refrigerator - I just have to check here which two cables are 0 to disconnect and connect to the pin because it is incorrectly installed.




So if I understood correctly:
1. I take out each of the wires - I take one and one probe from the meter (red) to it, and the other probe (black) to some pipes, e.g. from water
2. I repeat the operation for each cable

If it shows> ~ 220 V, it means it's a phase cable
If it shows 0 V it means it's cable 0

In my case, there will be two cables with 0 and two cables with ~ 220V

Do I understand correctly?

And you can write why there is no RCD and three-core cables?

xury wrote:

And you can write why there is no RCD and three-core cables?

I have no idea. What is the RCD and those cables you mentioned? From what I remember, builders made sockets and cables, and then an electrician set up a box. It was like that somehow.

This has not been done for 25 years. Installation is not in accordance with the regulations. This is how builders do their job.

JohhnyCage11 wrote:

xury wrote:

And you can write why there is no RCD and three-core cables?

I have no idea. What is the RCD and those cables you mentioned? From what I remember, builders made sockets and cables, and then an electrician set up a box. Somehow it was like that.

The main thing is that the tiles are ?
What is not important under plaster - electricians for organs on a hook
Unless it's a multimedia builder

JohhnyCage11 wrote:

xury wrote:

And you can write why there is no RCD and three-core cables?

I have no idea. What is the RCD and those cables you mentioned? From what I remember, builders made sockets and cables, and then an electrician set up a box. Somehow it was like that.

Good. somehow ... they did.
But why the wrong values of security (the absence of a differential / differential has already been mentioned by my colleagues)
If you were kind enough to post a photo of this box without a cover / mask (?)

xury wrote:

This has not been done for 25 years. Installation is not in accordance with the regulations. This is how builders do their job.

As I mentioned, the construction company that did construction work pulled cables and sockets, and at the end an electrician who had permissions came and set up the box.

Heh, the peasant asked a specific question and, as usual, electricians turned out to be philosophers.

Answer:

You set the range to alternating voltage (NOT CURRENT!) And take one wire in the paw (yes, the metal one in your hand) and the other pole to the contact. On phase you will have an indication of around 50V, on zero you should read 0V. Of course, this is not professional and "do not do it at home", but if there is no way out ...

The method is a bit dangerous because if you connect the wires for measuring the current by mistake, you will find out for yourself that you have found the phase. So if you are not familiar with the meter, maybe it's better to call an electrician or buy a neon lamp (a few zlotys is enough).

greetings. Kamil

Moderated By kozi966:

You get warnings for such advice in this forum, and that is also how it ends in this case.
This is a highly DANGEROUS tip.
3.1.11. Posting non-substantive posts with harmful advice, non-troubleshooting advice, and posting identical posts that replicate or repeat information from discussions.

If the meter shows between one wire and a grounded 160V pipe and between the other and 230V pipe. Which is phased and which is not? After all, the phase cannot be 160V with respect to the ground. Is it not? Unless someone has 160V in the socket, then maybe yes.

elpapiotr wrote:

JohhnyCage11 wrote:

xury wrote:

And you can write why there is no RCD and three-core cables?

I have no idea. What is the RCD and those cables you mentioned? From what I remember, builders made sockets and cables, and then an electrician set up a box. Somehow it was like that.

Good. somehow ... they did.
But why the wrong values of security (the absence of a differential / differential has already been mentioned by my colleagues)
If you were kind enough to post a photo of this box without a cover / mask (?)

Sure please

PS If something is wrongly done (done about 5 years ago), do I have the right to call him and tell him? All in all, it was paid to the construction company, and she hired an electrician.

The meter must show exactly the same value between phase and pipe as it shows between the two wires in the socket. From the value of the smaller and the larger it is impossible to judge it. Because how will it be on one 120V and 180V on the other. And between the wires in the socket is 230V, which is phase and which is neutral 120V or 180V?

kkkamil wrote:

Heh, the peasant asked a specific question and, as usual, electricians turned out to be philosophers. ...

Yeah? How to react to the content # 8 of the author's post? When we learn about such babes?
And the box and "elepstryk" are a failure, unfortunately, as a colleague wrote xury -

Quote:

This is how builders do their job

Of course, the guarantee / warranty period has already expired and the author of the topic may ... jump on them

In addition, on one of these wires there must be less to the pipe than on the other because it may turn out that both are in phase. :cry:

Added after 3 [minutes]:

And in general, it is probably better to check it with neon lights.

And no one will be tied to the walls. And this socket, you have to replace it with a socket with a pin and make a substitute for "anti-shock protection" to "safely" use the refrigerator. If this is the way installation is done throughout the house, you still need to think about securing the washing machine and other devices that require a grounding pin.

Łukasz.K wrote:

...
And in general, it is probably better to check it with neon lights.

Sure, because it may turn out that blue is in phase. The builders never thought that they were not allowed to lay 2-core cables, by the way.

Colleagues, unfortunately I do not know anything about it, I ordered a team that had an electrician and we did not even think that they could do something wrong. So what minimum should I do?

1. Buy a socket with a pin for a refrigerator, washing machine, microwave?
2. Take an electrician and he should connect it properly and ground it to the prongs right?
3. What's wrong with the box itself? Is it about the lack of an RCD? Is it possible to install it somehow?

What would you do in the present situation?

Not very popular advice, criticized on the forum by users (who expect applause of their own ideas) but ...
Get an electrician, save what he can.

PS. Among your friends, do not recommend (or even advise against) this team of peppers, because they bring shame to professionals.
And that it wasn't - the team didn't have an electrician, but someone who "licked two wires"

Without a 3-wire installation, you don't reel too much here. Connect the sockets with the pin and the pin to "0". And as for the box, you can't see much here. It is not known how the power goes, 1 or more phases. And what is the eti of 230 doing here?

kaz69 wrote:

Without a 3-wire installation, you don't reel too much here. Connect the sockets with the pin and the pin to "0" . And as for the box, you can't see much here. It is not known how the power goes, 1 or more phases. And what is the eti of 230 doing here?

According to the principle "we protect first, then we supply"
But in fact - even Solomon out of vain ... nothing can do, although there are veins of life, which do not know what role they play.

Just like XX years ago .

kaz69 wrote:

Without a 3-wire installation, you don't reel too much here. Connect the sockets with the pin and the pin to "0". And as for the box, you can't see much here. It is not known how the power goes, 1 or more phases. And what is the eti of 230 doing here?

Generally, it is done in such a way that you can turn off the electricity by sectors, such as the kitchen, children's room, bathroom or large room.

PS The refrigerator socket has a pin
PS 2 What is eti ze 230 and why are you surprised?

Because a colleague of the previous speaker does not know that it is ... a bell.

I was a bit surprised that such an "extended" system was equipped with a cabinet bell and no other security measures.