1 into 20 CDU output connection advice needed

Basic electrical and electronics, such as DC/Analog control.
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End2end
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1 into 20 CDU output connection advice needed

Postby End2end » Wed Jun 22, 2022 10:42 pm

I need some helping finding a suitable solution for my CDU output wire that splits the power into 20 outputs to go to all my control panel switches.
It will need to have some sort of outer insulation and I'd prefer screw terminals rather than having to solder the wires.

Can anyone advise on what is available for the job?
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Re: 1 into 20 CDU output connection advice needed

Postby Flashbang » Thu Jun 23, 2022 8:57 am

Its more usual to wire from the first switches common tab to the next switch and so on until the last switch is reached where the wire stops. i.e. all switches are daisy chained wired. Using ideally 16/0.2mm as the wire throughout.

But if you really want to use a multiway connection then the cheapest way is IMO to use 12 way 6Amp terminal blocks (two 12 ways = 24 outputs) and feed the positive from the CDU into the first terminal and link all bottom terminals together - Use some copper wire stripped from former mains lighting cable = 1.0mm2 or the 16/0.2mm etc then from the top of each terminal feed a switch.
Terminal Block distribution.jpg


Or you can use these, but they are more expensive....link to click
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Re: 1 into 20 CDU output connection advice needed

Postby End2end » Thu Jun 23, 2022 12:56 pm

Flashbang wrote:Its more usual to wire from the first switches common tab to the next switch and so on until the last switch is reached where the wire stops. i.e. all switches are daisy chained wired.

Hmm, I didn't know you could do it like that. :idea:
Thanks Flashbang. :mrgreen:
Just for clarity do you mean the middle tab?

Will have a think on how to implement it. :wink:
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Re: 1 into 20 CDU output connection advice needed

Postby Flashbang » Thu Jun 23, 2022 3:12 pm

Hi
Yes the common is the middle tab on Double Throw switches. :D
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Re: 1 into 20 CDU output connection advice needed

Postby Bufferstop » Thu Jun 23, 2022 6:08 pm

Hi some two position switches, including Peco passing contact have a different layout of the connections, the common is on its own at one end. The n/o and n/c connectors are closer together at the other end. It's about the most common alternative to common in the middle. Many switches have the terminals marked with, com, no, nc moulded in the plastic, some even have the diagrammatic representation printed on the sides. Often you only see them with a strong magnifier.
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Re: 1 into 20 CDU output connection advice needed

Postby RFS » Thu Jun 23, 2022 6:39 pm

You could also use some Wago switches - eg these https://www.ebay.co.uk/itm/403339270498?hash=item5de8e4d962:g:yhUAAOSwk8dhrfLF.

One wire from the CDU into one port of 5-way connectors, and 4 ports output. If all wires are of the same size then it's no problem having two output wires of the same size in one port. Or just daisy-chain more connectors to different parts of the layout. No soldering and no screws either!
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Re: 1 into 20 CDU output connection advice needed

Postby End2end » Thu Jun 23, 2022 9:26 pm

Thanks for the extra replies members.
By wiring the switches together this will also save a lot of wiring.....and mess inside the control panel. :D

Wago connectors are good but not in this case. :wink:
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Re: 1 into 20 CDU output connection advice needed

Postby Flashbang » Fri Jun 24, 2022 9:26 am

Bufferstop wrote:Hi some two position switches, including Peco passing contact have a different layout of the connections, the common is on its own at one end. The n/o and n/c connectors are closer together at the other end. It's about the most common alternative to common in the middle. Many switches have the terminals marked with, com, no, nc moulded in the plastic, some even have the diagrammatic representation printed on the sides. Often you only see them with a strong magnifier.

Not quite correct! The Peco PL26 Passing contact point lever has the Common connection in the middle of the two contact wiring tabs but the Common is off set towards one side more. See the internal picture of a PL26
Peco PL26.jpg
Peco PL26.jpg (82.84 KiB) Viewed 222 times


The Peco PL13 so called Micro switch that fits onto their PL10 solenoid motor does have the Common at one end and the contacts closer together at the other end.
PL13.JPG
PL13.JPG (26.04 KiB) Viewed 222 times


Toggle switches of the Double Throw type have the Common connection in between the contact tabs with the contact tabs on the outer ends. Its normal for these switches to make connection middle to outer tab in direct opposite to the position of the toggle or lever. i.e. Lever Up middle to bottom make connection. Lever Down middle to top make contact! :D
SPDT Toggle Switch.jpg
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Re: 1 into 20 CDU output connection advice needed

Postby Bufferstop » Fri Jun 24, 2022 11:01 am

Yep that's the one I got it mixed up with. I'd not seen the interior of the Peco switch, the way it avoids re energising the last coil fired is so simple!
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