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Old 20th December 2016, 11:06 PM   #1
Wayniac is offline Wayniac  United States
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Default Passing Wires Through Panels

I've read on this forum multiple times, that passing a single conductor through a metal panel is not recommended.

It has been posted, that a twisted pair passing through a metal panel is the preferred practice.

I'm curious, can someone please explain this to me? Thanks!
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Old 20th December 2016, 11:12 PM   #2
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Probably depends more on what the function of the single wire is.
Wires are passing through holes all the time. Think about the rear panel of the amp
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Old 20th December 2016, 11:42 PM   #3
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Old 21st December 2016, 12:40 AM   #4
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Quote:
Originally Posted by Wayniac View Post
a twisted pair passing through a metal panel is the preferred practice.
Currents flow in loops, so there has to be some route back to the source of the current.
If the way back isn't near the wire, then there's a large loop area that can result in noise problems.
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Old 21st December 2016, 12:59 AM   #5
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Quote:
Originally Posted by 2 picoDumbs View Post
Probably depends more on what the function of the single wire is.
Wires are passing through holes all the time. Think about the rear panel of the amp


Specifically, I'm building an F5 using diyAudio V3 PCBs. The wires I wish to pass through are the DC power and return. The wires will terminate on the F5 PCB about 1 cm after passing through the panel.

I plan on minimizing exposed wiring by running the both the AC and DC wiring in separate channels milled into the under side of the amplifier.

Attached is an image of my planned component lay out.

Click the image to open in full size.


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Old 21st December 2016, 01:12 AM   #6
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You don't need to run single wires through holes to achieve what you want here.

Even though that transformer looks nicely shielded, I think I would place the transformer right next to the front panel of the amp with caps in the middle of the amp case.
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Old 21st December 2016, 01:34 AM   #7
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Originally Posted by 2 picoDumbs View Post
You don't need to run single wires through holes to achieve what you want here.

Even though that transformer looks nicely shielded, I think I would place the transformer right next to the front panel of the amp with caps in the middle of the amp case.


Are you suggesting I twist the three DC power leads for transition through the panel?

Regarding the transformer location, I'll take that under consideration.

Thanks for your help. This is my first build...


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Old 21st December 2016, 01:40 AM   #8
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Do you mean 2xDC and 0V twisted together?
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Old 21st December 2016, 01:52 AM   #9
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Originally Posted by rayma View Post
Currents flow in loops, so there has to be some route back to the source of the current.
If the way back isn't near the wire, then there's a large loop area that can result in noise problems.


Thanks for this explanation. Many of the F5 photos I see here have individual wires for the DC runs to the PCBs. Of course, they are direct runs not passing through any chassis panels.


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Old 21st December 2016, 02:26 AM   #10
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Originally Posted by 2 picoDumbs View Post
Do you mean 2xDC and 0V twisted together?


Yes.


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