1 Topic by Alessio (edited by Alessio 2024-08-24 18:22:14)

Topic: Different wires connected to the same terminal

Hello everyone,
I'm probably taking the wrong approach.
I have problems with the properties of the wires. When I have multiple wires of different sections starting from a terminal, if I set the properties of a wire these are also assigned to all the other wires.
The name, voltage, etc, obviously must be the same but the section could be different.
I saw the "Apply properties to all conductors of this potential" flag but if I uncheck it, change the properties and enter it again it is enabled again (tried with 0.100.0-dev and 0.90).

Am I doing something wrong?

I attach an example.

Thank you.

Post's attachments

Attachment icon wire_issue.qet 118.56 kb, 36 downloads since 2024-08-24 

Re: Different wires connected to the same terminal

From an electrician's point of view, this is not permitted for safety reasons!
If the 25 mm² cable is appropriately fused and you have a short circuit on the 1.5 mm² cable, the 1.5 mm² cable will burn away!

And:
One terminal = one voltage = one color = one wire-gauge

From thin wire to thick wire may (!) be permitted, but will lead to misunderstandings!

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  • scorpio810
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Re: Different wires connected to the same terminal

So you have to use something other than the terminal or report folio to connect them like a fuse and cut equipotential, otherwise equipotentiality would be the same and section applied to all equipotential conductors, yes I know that changing the section or others entities of a conductor breaks equipotentiality...on QET program!

Of course isn't perfect but is  it for safety reasons!, like say plc-user nomicons/wink

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Re: Different wires connected to the same terminal

Only when you connect a 1.5mn² wire, for example, to a large busbar or repartitor but of course your wire is protected downstream by a 10A fuse will you have to cheat with a non-terminal type symbol to connect them together.
https://download.qelectrotech.org/qet/forum_img_2/th_LG-400410-WEB-R.jpg

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Re: Different wires connected to the same terminal

In your example .qet you shared, you wrote this:

If I set the properties of this wire they
are also assigned to the other one.
In practice they are two different wires
that start from the same terminal.
One wire must be 25mmq and the
other 1.5mmq.

https://download.qelectrotech.org/qet/forum_img_2/alessio.png

It's forbidden and dangerous to do so, and I wouldn't advise it. You should always connect two wires of the same section to the same screw terminal.

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Re: Different wires connected to the same terminal

I saw the "Apply properties to all conductors of this potential" flag but if I uncheck it, change the properties and enter it again it is enabled again (tried with 0.100.0-dev and 0.90).

It's deliberate!
Its for safety reasons, For security reasons, you should deactivate this checkbox each time you modify conductors. For example, adding a new wire with a different section in the equipotential wires..
Edit:
ps : I hope we've answered your question, which isn't easy to explain why we've put this in the code. I also hope we haven't offended you or questioned your skills as an electrician, that wasn't the point, if it was I apologise in advance.

Best regards,
Laurent

"Le jour où tu découvres le Libre, tu sais que tu ne pourras jamais plus revenir en arrière..."

Re: Different wires connected to the same terminal

Thanks everyone,
of course I know there might be a security issue.
I apologize for the misunderstanding, I took part of the diagram and quickly added a connection just to make my question clear.

ps : I hope we've answered your question, which isn't easy to explain why we've put this in the code. I also hope we haven't offended you or questioned your skills as an electrician, that wasn't the point, if it was I apologise in advance.

Thanks Laurent, no problem and no offense. I was wrong to post an example by modifying that part of the diagram.

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Re: Different wires connected to the same terminal

nomicons/wink

"Le jour où tu découvres le Libre, tu sais que tu ne pourras jamais plus revenir en arrière..."