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Should I twist DC power and ground wires from a power supply?

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5

$begingroup$

Is it beneficial to twist the red/green power/ground wires from a low-voltage (~5V), relatively low current (1 to 5 A) switching, desktop power supply?

This makes my wire bundle on a desk less chaotic, but will it reduce noise or provide any other benefit? Is there any reason why I should specifically avoid doing this?

power-supply

share|improve this question

asked 2 hours ago

tarabytetarabyte

1,42752751

$endgroup$

add a comment | 

5

$begingroup$

Is it beneficial to twist the red/green power/ground wires from a low-voltage (~5V), relatively low current (1 to 5 A) switching, desktop power supply?

This makes my wire bundle on a desk less chaotic, but will it reduce noise or provide any other benefit? Is there any reason why I should specifically avoid doing this?

power-supply

share|improve this question

asked 2 hours ago

tarabytetarabyte

1,42752751

$endgroup$

add a comment | 

$begingroup$

Is it beneficial to twist the red/green power/ground wires from a low-voltage (~5V), relatively low current (1 to 5 A) switching, desktop power supply?

This makes my wire bundle on a desk less chaotic, but will it reduce noise or provide any other benefit? Is there any reason why I should specifically avoid doing this?

power-supply

share|improve this question

asked 2 hours ago

tarabytetarabyte

1,42752751

$endgroup$

share|improve this question

asked 2 hours ago

tarabytetarabyte

1,42752751

share|improve this question

asked 2 hours ago

tarabytetarabyte

1,42752751

asked 2 hours ago

tarabytetarabyte

1,42752751

asked 2 hours ago

tarabytetarabyte

1,42752751

3 Answers
3

active

oldest

votes

8

$begingroup$

Twisting wires reduces the magnetic loop area of the wires, this has two implications:

1) Reduced susceptibility to noise from magnetic fields, with twisted wires an a smaller magnetic loop area, external magnetic fields will induce less current in the loop made by the wires than straight cables.

2) Reduced magnetic radiation from loads that are switching. A magnetic loop is an antenna, switching loads and changing currents cause the antenna to radiate magnetic radiation, which can cause noise in other devices.

Generally its a good idea to twist the wires and reduce the radiation and susceptibility to noise.

I can't think of any reason why you wouldn't do this, on all of my prototypes/products I make sure the wires are twisted.

share|improve this answer

edited 2 hours ago

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Not only does the twisting reduce the loop area, but more importantly every twist of the cable introduces adjacent areas of opposite polarity for a given field. In on other words the emitted or received noise of adjacent loops cancels each other. The twisted pair diagram should show alternate arrows in the opposite direction.
  $endgroup$
  – scorpdaddy
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  In addition, a twisted pair has got a higher capacitance than two independent wires since they are forced to be quite as close as possible to each other, which could have a slight positive effect when it comes to attenuation of high-frequency distortion or noise...
  $endgroup$
  – aschipfl
  1 hour ago
  

  
  
  
  

add a comment | 

3

$begingroup$

It would reduced radiated noise. No specific reason to really avoid it since the only real reasons are reduced heat dissipation and overkinking the cable which shouldn't happen if you do it properly.

It would also reduce noise that is coupled to the lines that enters the power supply (by ensuring the noise is picked up "identically" on both lines), but that barely matters at all for something like the kind of power supply you probably have.

share|improve this answer

edited 1 hour ago

answered 2 hours ago

ToorToor

2,837317

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It'll reduce susceptibility to radiated interference, too, but it would be a strange work environment where that could make a difference.
  $endgroup$
  – TimWescott
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @TimWescott Yes, radiated noise from the power supply is already unlikely to be an issue, let alone the power supply itself being vulnerable to external radio interference which is why I didn't mention it.
  $endgroup$
  – Toor
  2 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  This answer should be corrected to indicate that twisting reduces radiated noise and susceptibility to incoming noise.
  $endgroup$
  – scorpdaddy
  1 hour ago
  
  

  
  
  
  

add a comment | 

-1

$begingroup$

Twisting power and return lines together will not cause an adverse affect electrically. Also, any high frequency noise that happens to exist on those lines will radiate less, though maybe only marginally less, due to a tighter coupling between them caused by the reduced geometric separation of the conductors.

share|improve this answer

answered 2 hours ago

AJboticAJbotic

13

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Twisting the lines reduces 50-60 Hz noise as well as high frequency noise. In test it shows substantial reduction of emissions and susceptability that is not offset by reduced geometric separation.
  $endgroup$
  – scorpdaddy
  1 hour ago
  

  
  
  
  

add a comment | 

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8

$begingroup$

Twisting wires reduces the magnetic loop area of the wires, this has two implications:

1) Reduced susceptibility to noise from magnetic fields, with twisted wires an a smaller magnetic loop area, external magnetic fields will induce less current in the loop made by the wires than straight cables.

2) Reduced magnetic radiation from loads that are switching. A magnetic loop is an antenna, switching loads and changing currents cause the antenna to radiate magnetic radiation, which can cause noise in other devices.

Generally its a good idea to twist the wires and reduce the radiation and susceptibility to noise.

I can't think of any reason why you wouldn't do this, on all of my prototypes/products I make sure the wires are twisted.

share|improve this answer

edited 2 hours ago

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Not only does the twisting reduce the loop area, but more importantly every twist of the cable introduces adjacent areas of opposite polarity for a given field. In on other words the emitted or received noise of adjacent loops cancels each other. The twisted pair diagram should show alternate arrows in the opposite direction.
  $endgroup$
  – scorpdaddy
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  In addition, a twisted pair has got a higher capacitance than two independent wires since they are forced to be quite as close as possible to each other, which could have a slight positive effect when it comes to attenuation of high-frequency distortion or noise...
  $endgroup$
  – aschipfl
  1 hour ago
  

  
  
  
  

add a comment | 

8

$begingroup$

Twisting wires reduces the magnetic loop area of the wires, this has two implications:

1) Reduced susceptibility to noise from magnetic fields, with twisted wires an a smaller magnetic loop area, external magnetic fields will induce less current in the loop made by the wires than straight cables.

2) Reduced magnetic radiation from loads that are switching. A magnetic loop is an antenna, switching loads and changing currents cause the antenna to radiate magnetic radiation, which can cause noise in other devices.

Generally its a good idea to twist the wires and reduce the radiation and susceptibility to noise.

I can't think of any reason why you wouldn't do this, on all of my prototypes/products I make sure the wires are twisted.

share|improve this answer

edited 2 hours ago

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Not only does the twisting reduce the loop area, but more importantly every twist of the cable introduces adjacent areas of opposite polarity for a given field. In on other words the emitted or received noise of adjacent loops cancels each other. The twisted pair diagram should show alternate arrows in the opposite direction.
  $endgroup$
  – scorpdaddy
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  In addition, a twisted pair has got a higher capacitance than two independent wires since they are forced to be quite as close as possible to each other, which could have a slight positive effect when it comes to attenuation of high-frequency distortion or noise...
  $endgroup$
  – aschipfl
  1 hour ago
  

  
  
  
  

add a comment | 

$begingroup$

Twisting wires reduces the magnetic loop area of the wires, this has two implications:

1) Reduced susceptibility to noise from magnetic fields, with twisted wires an a smaller magnetic loop area, external magnetic fields will induce less current in the loop made by the wires than straight cables.

2) Reduced magnetic radiation from loads that are switching. A magnetic loop is an antenna, switching loads and changing currents cause the antenna to radiate magnetic radiation, which can cause noise in other devices.

Generally its a good idea to twist the wires and reduce the radiation and susceptibility to noise.

I can't think of any reason why you wouldn't do this, on all of my prototypes/products I make sure the wires are twisted.

share|improve this answer

edited 2 hours ago

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

$endgroup$

share|improve this answer

edited 2 hours ago

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

answered 2 hours ago

laptop2dlaptop2d

29.9k123788

3

$begingroup$

It would reduced radiated noise. No specific reason to really avoid it since the only real reasons are reduced heat dissipation and overkinking the cable which shouldn't happen if you do it properly.

It would also reduce noise that is coupled to the lines that enters the power supply (by ensuring the noise is picked up "identically" on both lines), but that barely matters at all for something like the kind of power supply you probably have.

share|improve this answer

edited 1 hour ago

answered 2 hours ago

ToorToor

2,837317

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It'll reduce susceptibility to radiated interference, too, but it would be a strange work environment where that could make a difference.
  $endgroup$
  – TimWescott
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @TimWescott Yes, radiated noise from the power supply is already unlikely to be an issue, let alone the power supply itself being vulnerable to external radio interference which is why I didn't mention it.
  $endgroup$
  – Toor
  2 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  This answer should be corrected to indicate that twisting reduces radiated noise and susceptibility to incoming noise.
  $endgroup$
  – scorpdaddy
  1 hour ago
  
  

  
  
  
  

add a comment | 

3

$begingroup$

It would reduced radiated noise. No specific reason to really avoid it since the only real reasons are reduced heat dissipation and overkinking the cable which shouldn't happen if you do it properly.

It would also reduce noise that is coupled to the lines that enters the power supply (by ensuring the noise is picked up "identically" on both lines), but that barely matters at all for something like the kind of power supply you probably have.

share|improve this answer

edited 1 hour ago

answered 2 hours ago

ToorToor

2,837317

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It'll reduce susceptibility to radiated interference, too, but it would be a strange work environment where that could make a difference.
  $endgroup$
  – TimWescott
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @TimWescott Yes, radiated noise from the power supply is already unlikely to be an issue, let alone the power supply itself being vulnerable to external radio interference which is why I didn't mention it.
  $endgroup$
  – Toor
  2 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  This answer should be corrected to indicate that twisting reduces radiated noise and susceptibility to incoming noise.
  $endgroup$
  – scorpdaddy
  1 hour ago
  
  

  
  
  
  

add a comment | 

$begingroup$

It would reduced radiated noise. No specific reason to really avoid it since the only real reasons are reduced heat dissipation and overkinking the cable which shouldn't happen if you do it properly.

It would also reduce noise that is coupled to the lines that enters the power supply (by ensuring the noise is picked up "identically" on both lines), but that barely matters at all for something like the kind of power supply you probably have.

share|improve this answer

edited 1 hour ago

answered 2 hours ago

ToorToor

2,837317

$endgroup$

share|improve this answer

edited 1 hour ago

answered 2 hours ago

ToorToor

2,837317

answered 2 hours ago

ToorToor

2,837317

answered 2 hours ago

ToorToor

2,837317

-1

$begingroup$

Twisting power and return lines together will not cause an adverse affect electrically. Also, any high frequency noise that happens to exist on those lines will radiate less, though maybe only marginally less, due to a tighter coupling between them caused by the reduced geometric separation of the conductors.

share|improve this answer

answered 2 hours ago

AJboticAJbotic

13

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Twisting the lines reduces 50-60 Hz noise as well as high frequency noise. In test it shows substantial reduction of emissions and susceptability that is not offset by reduced geometric separation.
  $endgroup$
  – scorpdaddy
  1 hour ago
  

  
  
  
  

add a comment | 

-1

$begingroup$

Twisting power and return lines together will not cause an adverse affect electrically. Also, any high frequency noise that happens to exist on those lines will radiate less, though maybe only marginally less, due to a tighter coupling between them caused by the reduced geometric separation of the conductors.

share|improve this answer

answered 2 hours ago

AJboticAJbotic

13

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Twisting the lines reduces 50-60 Hz noise as well as high frequency noise. In test it shows substantial reduction of emissions and susceptability that is not offset by reduced geometric separation.
  $endgroup$
  – scorpdaddy
  1 hour ago
  

  
  
  
  

add a comment | 

$begingroup$

Twisting power and return lines together will not cause an adverse affect electrically. Also, any high frequency noise that happens to exist on those lines will radiate less, though maybe only marginally less, due to a tighter coupling between them caused by the reduced geometric separation of the conductors.

share|improve this answer

answered 2 hours ago

AJboticAJbotic

13

$endgroup$

share|improve this answer

answered 2 hours ago

AJboticAJbotic

13

answered 2 hours ago

AJboticAJbotic

13

answered 2 hours ago

AJboticAJbotic

13