Answers.Body: <p>Basically, they're used to hold the wires together but also to hold them when you need to connect 2 wires together.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-11-24T19:54:46.330Z
Answers.LastActivityDate: 2016-11-24T19:54:46.330Z
Answers.UserDisplayName: LegoTrainz2003
Answers.Body: <p>While researching information for this question, I stumbled upon the answer but thought I would post anyway to share my findings.</p>
  
  <p>The <a href="http://www.bricklink.com/catalogItem.asp?S=9700-1" rel="nofollow noreferrer">Bricklink entry for the 9700 Technic Control Center set</a> has a secondary picture which is the front cover of the instruction booklet.
  <img src="https://i.sstatic.net/8TsuJ.jpg" alt="9700 Technic Control Center instruction booklet"></p>
  
  <p>The 5  Electric, Plug Holder 4.5V/12V elements can be seen in use as holders for the shorter wires connecting to the motors that make up the model. Using the holders provides easy access to plug in longer wires from the control center unit. The holders are necessary because, unlike the connections on later <a href="http://www.bricklink.com/SL/5041-1.jpg?0" rel="nofollow noreferrer">9v wires</a> that can be built into a model like standard pieces, the connections on the older <a href="http://www.bricklink.com/PL/bb81c190.jpg?0" rel="nofollow noreferrer">12v/4.5v wires</a> cannot.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-02-27T09:28:21.383Z
Answers.Text: So basically it serves to hold plugs in place when they aren't plugged in anything, typically when extending wires. Contrast with the [alternate build for set 7745](http://www.peeron.com/scans/7745-1/20) where the plugs just lie there inelegantly. In a way, I suppose you could compare this part to the new [pneumatic connector](http://www.brickset.com/parts/?part=4648927) which holds pneumatic tubes firmly into place. Of course, electricity tends to make wires move less.
Answers.UserDisplayName: Joubarc
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-02-27T09:32:13.273Z
Answers.Text: Also, notice the coloured plugs and tiles. As the plug holder holdes the plug connecting to the motor into place, you can safely remove the ones coming from your control center, and you won't have any problem knowing which one goes where thanks to the colouring scheme.
Answers.UserDisplayName: Joubarc
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-02-27T18:36:46.207Z
Answers.Text: @Joubarc Indeed - this attention to enabling the wires to be connected and disconnected is likely due to this being a dacta set and so will get a lot of use. Those coloured plugs are also unique to this set as far as I can tell.
Answers.UserDisplayName: mcqwerty
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-02-27T02:36:13.063Z
Answers.LastActivityDate: 2013-02-27T02:36:13.063Z
Answers.UserDisplayName: mcqwerty
Body: <p>I have seen the <a href="http://www.bricklink.com/catalogItem.asp?P=2757" rel="nofollow noreferrer">Electric, Plug Holder 4.5V/12V on bricklink</a> a few times and have often wondered what it is for.</p>
  
  <p><img src="https://i.sstatic.net/vd5fI.jpg" alt="[Electric, Plug Holder 4.5V/12V"></p>
  
  <p>According to Bricklink, it was only ever produced in Light Gray and <a href="http://www.bricklink.com/catalogItemIn.asp?P=2757&amp;colorID=9&amp;in=A" rel="nofollow noreferrer">appeared in 3 sets</a> between 1987 and 1992.</p>
  
  <p>Two of the sets were just Service type sets containing cables and small elements with no instructions or suggestion of usage of the Electric, Plug Holder 4.5V/12V itself.</p>
  
  <p>However, it also appeared in set <a href="http://www.bricklink.com/catalogItem.asp?S=9700-1" rel="nofollow noreferrer">9700 Technic Control Center</a>. Unfortunately neither <a href="http://www.peeron.com/inv/sets/9700-1" rel="nofollow noreferrer">Peeron</a> nor <a href="http://letsbuilditagain.com/lego-instructions-search.php?q=9700&amp;image2.x=-680&amp;image2.y=-265" rel="nofollow noreferrer">LetsBuildItAgain</a> have a listing for the instructions. So I can't see the step where any of the 5 that were included with this set are used.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2013-02-27T07:42:32.340Z
Comments.Text: Well, it holds plugs, right?
Comments.UserDisplayName: Joubarc
Tags: <piece-information><12v>
Title: Electric, Plug Holder 4.5V/12V what is it for?
UserDisplayName: mcqwerty
ThreadText: # Electric, Plug Holder 4.5V/12V what is it for?
  
  (Asked by: username_0 on 2013-02-27)
  
  I have seen the [Electric, Plug Holder 4.5V/12V on bricklink](http://www.bricklink.com/catalogItem.asp?P=2757) a few times and have often wondered what it is for.
  
  ![[Electric, Plug Holder 4.5V/12V](https://i.sstatic.net/vd5fI.jpg)
  
  According to Bricklink, it was only ever produced in Light Gray and [appeared in 3 sets](http://www.bricklink.com/catalogItemIn.asp?P=2757&colorID=9&in=A) between 1987 and 1992.
  
  Two of the sets were just Service type sets containing cables and small elements with no instructions or suggestion of usage of the Electric, Plug Holder 4.5V/12V itself.
  
  However, it also appeared in set [9700 Technic Control Center](http://www.bricklink.com/catalogItem.asp?S=9700-1). Unfortunately neither [Peeron](http://www.peeron.com/inv/sets/9700-1) nor [LetsBuildItAgain](http://letsbuilditagain.com/lego-instructions-search.php?q=9700&image2.x=-680&image2.y=-265) have a listing for the instructions. So I can't see the step where any of the 5 that were included with this set are used.
  
  **Tags:** piece-information, 12v
  > **Comments:**
  > **username_1**: Well, it holds plugs, right?  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_0 on 2013-02-27. Score: 7 | Accepted answer
  
  While researching information for this question, I stumbled upon the answer but thought I would post anyway to share my findings.
  
  The [Bricklink entry for the 9700 Technic Control Center set](http://www.bricklink.com/catalogItem.asp?S=9700-1) has a secondary picture which is the front cover of the instruction booklet.
  ![9700 Technic Control Center instruction booklet](https://i.sstatic.net/8TsuJ.jpg)
  
  The 5 Electric, Plug Holder 4.5V/12V elements can be seen in use as holders for the shorter wires connecting to the motors that make up the model. Using the holders provides easy access to plug in longer wires from the control center unit. The holders are necessary because, unlike the connections on later [9v wires](http://www.bricklink.com/SL/5041-1.jpg?0) that can be built into a model like standard pieces, the connections on the older [12v/4.5v wires](http://www.bricklink.com/PL/bb81c190.jpg?0) cannot.
  
  > **Comments:**
  > **username_1**: So basically it serves to hold plugs in place when they aren't plugged in anything, typically when extending wires. Contrast with the [alternate build for set 7745](http://www.peeron.com/scans/7745-1/20) where the plugs just lie there inelegantly. In a way, I suppose you could compare this part to the new [pneumatic connector](http://www.brickset.com/parts/?part=4648927) which holds pneumatic tubes firmly into place. Of course, electricity tends to make wires move less.  
  > **username_1**: Also, notice the coloured plugs and tiles. As the plug holder holdes the plug connecting to the motor into place, you can safely remove the ones coming from your control center, and you won't have any problem knowing which one goes where thanks to the colouring scheme.  
  > **username_0**: @Joubarc Indeed - this attention to enabling the wires to be connected and disconnected is likely due to this being a dacta set and so will get a lot of use. Those coloured plugs are also unique to this set as far as I can tell.  
  
  ---
  
  ### Answer by username_2 on 2016-11-24. Score: 0
  
  Basically, they're used to hold the wires together but also to hold them when you need to connect 2 wires together.
  
  
  ---
  
  