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Old 21st February 2015, 10:47 PM   #1
rif is offline rif  United States
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Default why wire nuts for mains connection?

Just curious

Why are wire nuts used, at least in the US, in junction boxes, switch boxes, outlet boxes, etc. for ac mains connections? why not crimp connectors as we use in our chassis?

I find them frustrating, especially when tying together 3 wires.
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Old 21st February 2015, 11:22 PM   #2
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I think that correctly used they create an easy gas-tight connection. Crimp connectors require more time & labor. Are you using the correct size?
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Old 22nd February 2015, 02:47 AM   #3
Enzo is offline Enzo  United States
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Agree, I have a section box with my collection of wire nuts. They come in many sizes. If you are tying three 12ga wires together, you need a nut designed for it.

They are cheap, reliable, installed without tools, and easily undone for changes or troubleshooting.


I find it baffling when a customer brings me an amp, where the wires to the speaker plug onto the board with a molex connector, yet they leave the connector on the board and cut the wires a couple inches out. ARRRGGGHHH! Just unplug the thing... I see wire nuts like that. A crimp is a splice, while a wire nut is a connector.
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Old 22nd February 2015, 02:54 AM   #4
ArtG is offline ArtG  United States
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It is important to strip the wires to the correct length, and align the wires (lengthwise) into the wire nut. I've also found some brands far easier to use than others. My favorite is "Ideal" brand. Use the correct size for your application.
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Old 22nd February 2015, 04:25 PM   #5
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One reason crimp connectors are not used: Most house wiring is solid wire, a no-no with crimps. E
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Old 22nd February 2015, 06:19 PM   #6
M Gregg is offline M Gregg  United Kingdom
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Can you post a pic of a wire nut..

Years ago Screwits were used in American industry..however they were banned in the UK.

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M. Gregg

Last edited by M Gregg; 22nd February 2015 at 06:27 PM.
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Old 22nd February 2015, 06:41 PM   #7
rif is offline rif  United States
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http://ecx.images-amazon.com/images/...L._SL1500_.jpg
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Old 22nd February 2015, 06:48 PM   #8
M Gregg is offline M Gregg  United Kingdom
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Yes,

that's what we called screwits.

http://www.theiet.org/Forums/Forum/m...&threadid=3659

Apparently they had problems with earths becoming disconnected and live cables on equipment vibrating loose and touching down making metalwork live on machines.
The ones we had were yellow with little plastic wings on the sides. (Provided by the company at the time)
We used them for years until the sudden change.

Pronounced "screw-it" I don't even remember where the name came from .

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M. Gregg

Last edited by M Gregg; 22nd February 2015 at 07:02 PM.
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Old 22nd February 2015, 07:24 PM   #9
rif is offline rif  United States
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What do you guys use in the UK, couldn't follow most of that thread. Pix would be great.
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Old 22nd February 2015, 07:38 PM   #10
M Gregg is offline M Gregg  United Kingdom
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In the UK,

They advise not using junction boxes..if they are used they should be accessible..

It causes a few problems with the definition on what is accessible. Under floor boards is not really considered accessible because
people put laminate flooring down and this changes the situation..

So things like this have been used..
Click the image to open in full size.

However obviously its dependant on the standards and where its being fitted etc.
I have seen things like this:
Click the image to open in full size.

However the accessibility is the issue.

Years ago people used to just push strip connectors tapped up into ceiling cavities to fit lights, however its not allowed now.

Central heating in houses uses its own type of box like this:

Click the image to open in full size.

Obviously the current rating etc has to be taken into account.

The old long time used was this:
Click the image to open in full size.

But if the box is not accessible its supposed to be a permanent joint which makes this a bit difficult to use now..so soldered or crimped was the idea.
I hope this is of help..there are fittings for ponds outside it goes on (waterproof)..etc
In the UK fittings have whats called an IP rating depending on the type of environment its going to be used in.
Ie splash proof,drip proof, flame proof etc

The above are domestic, on machines we use metal boxes with clip in connectors and gasket sealed lids. This allows for conduit or SWA (steel wire armoured) connectors etc. Like this:

Click the image to open in full size.
Click the image to open in full size.


I feel like I'm droning on so I'll stop..
Here is an example of a UK supplier so you can have a search..

http://www.neweysonline.co.uk/alumin...Search.raction

( I have no connection its just for interest)

Regards
M. Gregg

Last edited by M Gregg; 22nd February 2015 at 08:07 PM.
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